Leveraging Climate Finance to Integrate Nature-Based Solutions for Urban Resilience in Nile Delta Vulnerable Coastal Zones

Leveraging Climate Finance to Integrate Nature-Based Solutions for Urban Resilience in Nile Delta Vulnerable Coastal Zones | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Leveraging Climate Finance to Integrate Nature-Based Solutions for Urban Resilience in Nile Delta Vulnerable Coastal Zones Taher Osman, Ahmed EL-Nemr This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7979335/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract The Nile Delta, a global climate vulnerability hotspot, faces compound risks from sea-level rise (SLR), land subsidence, and coastal erosion, threatening its densely populated urban centers and critical economic assets. A significant disconnect persists between available international climate finance and the on-the-ground implementation of cost-effective Nature-Based Solutions (NbS) for urban resilience in Egypt. This paper develops and applies a novel integrated framework to bridge this gap by systematically linking climate finance mechanisms with prioritized NbS interventions and measurable urban resilience outcomes. The framework integrates GIS-based vulnerability modeling, multi-criteria assessment of NbS, and a review of climate finance instruments. It is applied to vulnerable coastal governorates, including Damietta, Port Said, and the Rosetta/Burullus region. The analysis identifies specific "hotspots" and prioritizes context-specific NbS, such as soft dikes for critical infrastructure protection and dune restoration for tourism-dependent areas. A financial viability assessment demonstrates that the co-benefits of NbS (e.g., biodiversity enhancement, tourism revenue) often exceed implementation costs, presenting a strong case for investment. The framework provides a strategic pathway for Egyptian policymakers and international funders to overcome institutional and financial barriers, scale up NbS implementation, and transition from a cycle of maladaptive hard engineering to sustainable, resilient coastal governance. Climate Finance Nature-Based Solutions (NbS) Urban Resilience Nile Delta Coastal Adaptation Sea-Level Rise Egypt Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 1. Introduction The Nile Delta is one of the world's most vulnerable deltaic systems to the impacts of climate change (Abdrabo & Hassaan, 2015; ACCNDP, 2016). Its low-lying topography, combined with high population density and significant economic activity, creates a precarious socio-ecological system under increasing threat (Dickson et al., 2022; Fanchette, 2025). The region faces a confluence of reinforcing hazards that create a state of compound risk, where the total impact is greater than the sum of its parts. Global mean sea-level rise (SLR), projected to reach between $ 0.61 $ m and $ 1.10 $ m by 2100 under the high-emissions scenario RCP8.5, represents a primary threat (IPCC, 2019). However, this global figure is significantly amplified at the local level by severe land subsidence. Data from tide gauges indicate that parts of the delta are sinking at rates up to 5.3 mm/year, particularly in the vicinity of Port Said (CoRI, 2012; Dasgupta et al., 2009). This convergence of global SLR and local subsidence results in a multiplicative, rather than additive, effect on relative sea-level rise. A global SLR of $ 0.84 $ m could translate to a local relative sea-level rise of over $ 1.3 $ m in the most affected areas by 2100. This dramatically shortens the timeline for catastrophic impacts and renders adaptation plans based solely on global SLR projections dangerously conservative for local-level planning. The physical consequences of this accelerated relative SLR are already evident. Coastal erosion is rampant, with shoreline retreat rates exceeding 30 m/year in unprotected areas, particularly around the Rosetta and Damietta promontories, which have been sediment-starved since the construction of the Aswan High Dam (IHCantabria, 2017; CoRI, 2012). This erosion, coupled with increased frequency and intensity of storm surges, leads to recurrent coastal flooding and progressive saltwater intrusion into the delta's vital freshwater aquifer, threatening agricultural productivity and drinking water supplies (Carnegie Endowment for International Peace, 2023; El-Raey et al., 1999; Frihy & El-Sayed, 2013). These physical hazards converge on a region of immense socioeconomic importance to Egypt. The Nile Delta hosts over half of the nation's economic activity, accounts for 30–40% of its agricultural production, and is home to major urban and industrial centers, including Alexandria, Port Said, and Damietta (Abdrabo & Hassaan, 2015; Agrawala et al., 2004; Hassan & Abdrabo, 2013). A significant portion of this population and economic infrastructure is concentrated in Low Elevation Coastal Zones (LECZs), defined as areas less than 10 meters above sea level, creating a "perfect storm" of high exposure and acute vulnerability (Dasgupta et al., 2009; Carnegie Endowment for International Peace, 2023). Projections indicate that a 1 m SLR could inundate approximately 20% of the delta, displacing over 6 million people and causing catastrophic economic damage (ACCNDP, 2016; El-Raey et al., 1999; IPCC, 2022). Historically, Egypt's response to coastal threats has been dominated by a reliance on "gray" or hard engineering structures, such as seawalls, revetments, and groynes (UNDP, 2017; IHCantabria, 2017). While providing localized protection, this approach has often proven to be maladaptive in the long term. Hard structures frequently reflect wave energy and interrupt longshore sediment transport, leading to exacerbated erosion in adjacent, downdrift areas. This creates a cascading problem that necessitates the construction of ever-more-extensive and costly defenses, locking the coastline into a rigid and unsustainable management cycle (UNDP, 2017; IHCantabria, 2017). Furthermore, these structures degrade the natural and aesthetic value of the coastline, negatively impacting tourism and destroying coastal habitats. In recognition of these limitations, there has been a notable policy shift towards embracing "soft engineering" or Nature-Based Solutions (NbS). Egypt's National Strategy for Adaptation to Climate Change and Disaster Risk Reduction (NSACC) and its Third National Communication (TNC) to the UNFCCC explicitly call for the integration of soft protection measures (UNDP, 2017; GCF, 2017; Kumar et al., 2020). NbS are defined by the International Union for Conservation of Nature (IUCN) as "actions to protect, sustainably manage, and restore natural or modified ecosystems, that address societal challenges effectively and adaptively, simultaneously providing human well-being and biodiversity benefits" (Cohen-Shacham et al., 2016; Stockholm Environment Institute (SEI), 2022). In the coastal context, this includes interventions such as restoring and stabilizing sand dunes, rehabilitating coastal wetlands and salt marshes to act as natural buffers, and constructing "soft" dikes using natural materials that mimic ecosystem functions (Pathak et al., 2024; IHCantabria, 2017). Despite this high-level policy endorsement, the transition to NbS has stalled. On-the-ground implementation remains largely confined to small-scale pilot projects, such as the testing of soft dike designs in Mastroh under the Adaptation to Climate Change in the Nile Delta through Integrated Coastal Zone Management Project (ACCNDP) (UNDP, 2017). The paradigm shift from gray to green infrastructure is currently more aspirational than operational. The underlying cause of this inertia is not a lack of technical knowledge but a systemic failure to bridge the gap between policy intent and the financial and institutional mechanisms required for large-scale implementation. This stalled transition represents the central problem this paper seeks to address, moving beyond identifying the problem to proposing a structured solution. The global climate finance architecture has expanded significantly, with substantial capital available for adaptation projects in developing nations. Multilateral funds like the Green Climate Fund (GCF), programs led by the World Bank, and innovative blended finance models are actively seeking to fund NbS, with billions of dollars committed to nature-related resilience projects (ACCNDP, 2016; Shirley et al., 2025; Climate Policy Initiative, 2024; World Bank, 2025). In Africa alone, nearly 300 new resilience projects based on nature secured over $ 21 billion between 2012 and 2023 (Shirley et al., 2025). However, a persistent implementation gap prevents this capital from flowing at the scale and pace required. Globally, the financing gap for nature protection exceeds $ 700 billion annually, with private finance constituting a mere 14% of the total investment in NbS (WWF, 2022). The primary barriers are not a scarcity of funds but a scarcity of "bankable" projects. Investors, both public and private, cite several key obstacles: a weak evidence base on the financial returns and long-term effectiveness of NbS; the novelty and perceived risk of these approaches compared to conventional engineering; and a lack of projects that are designed at a scale sufficient to attract large-scale institutional investment (WWF, 2022; Seddon et al., 2020). This "bankability" problem is fundamentally an institutional failure. In the context of Egypt's coastal management, identified weaknesses such as poor inter-agency coordination, fragmented planning processes, and inadequate data sharing directly inhibit the development of the large-scale, technically sound, and financially viable NbS proposals that investors require (UNDP, 2017; IHCantabria, 2017; EEAA, 2016). Therefore, unlocking climate finance for the Nile Delta is not merely a financial challenge; it is a challenge of institutional reform and strategic planning. It requires a systematic process for identifying risks, designing effective solutions, quantifying their benefits, and presenting them in a format that meets the rigorous standards of international financiers. The objective of this paper is to develop and apply an integrated analytical framework that directly links climate finance mechanisms to the planning, prioritization, and implementation of NbS for urban resilience in the Nile Delta's vulnerable coastal zones. This research moves beyond descriptive accounts of climate vulnerability to propose a structured, replicable methodology for creating a pipeline of bankable, large-scale NbS investment opportunities. The novelty of this contribution lies in its deliberate synthesis of three traditionally siloed domains: (1) climate finance and investment appraisal; (2) ecological engineering and NbS design; and (3) urban resilience and spatial planning. By creating a logical pathway from risk assessment to financial structuring, the framework provides a practical tool for policymakers and project developers. It is designed to support the achievement of Egypt's national adaptation goals, as well as its commitments under the Sustainable Development Goals (SDGs), particularly SDG 11 (Sustainable Cities and Communities) and SDG 13 (Climate Action). In doing so, it offers a potential model for other climate-vulnerable deltaic regions worldwide that face similar challenges in translating adaptation needs into fundable actions. 2. Methodology 2.1. Study Area Table 1 the attribute of the five critical hotspots along the Nile Delta coast Area No. Governorate / Area Location Coordinates (From – To) Vulnerability Criteria Land Subsidence (mm/yr) Natural Ground Level (m) Proposed Site / Design Model(s) Length of Protection (km) Average Cost (Million EGP) 1 Kafr Elsheikh (Area 1) West Burullus inlet From 31°33'46.49"N, 30°57'23.36"E → To 31°32'26.43"N, 30°57'24.83"E Low-lying, rapidly subsiding, exposed without protection 0.0–1.0 0.0–1.0 Beaches, narrow Burullus Lake barrier, international road, proposals for farms & urban expansion 27 216 2 Port Said (Area 2) West Ashom Elgazni Boghaz From 31°9'54.52"N, 32°15'25.35"E → To 31°9'28.29"N, 32°15'27.89"E Low-lying, highly eroded, exposed without protection 3.0–5.0 0.8–2.0 Resort beaches near Manzala Lake barrier, international road protection 12 96 3 Beheira (Area 3) West Rosetta estuary, downstream of the 9 groins From 31°29'40.63"N, 30°7'47.79"E → To 31°29'15.31"N, 30°7'47.17"E Low-lying, highly eroded, shifting sand due to groin construction 0.0–3.0 0.0–1.0 Beaches and cultivated fields 3 48 4 Damietta (Area 4) East of new Damietta city From 31°29'47.04"N, 31°52'37.35"E → To 31°28'54.36"N, 31°52'39.53"E Low-lying, subsiding, moderately exposed with limited protection 1.0–2.0 1.0–2.0 Resort beaches and cultivated areas 12 96 5 Dakahlia (Area 5) West of new Gamasa city From 31°29'12.16"N, 31°28'10.19"E → To 31°28'49.51"N, 31°28'9.35"E Low-lying, exposed without protection 0.5–1.0 1.0–2.0 Resort beaches, cultivated lands, international road 15 96 This study method (Fig. 1 ) focuses on the coastal governorates of the Nile Delta (Fig. 2 ), which are recognized as national and global hotspots of climate vulnerability (UNDP, 2017; IHCantabria, 2017). The analysis is centered on three priority zones identified for their acute exposure to compound climate risks: the coastal stretches of Damietta, Port Said, and the Rosetta/Burullus region (Table 1 ). These areas are characterized by low-lying topography, with vast tracts of land situated below 3 m elevation, making them highly susceptible to inundation from SLR and storm surges (UNDP, 2017). They host a dense concentration of population, critical infrastructure (including the Burullus and Jamasa power plants and the international coastal road), and vital economic assets spanning agriculture, fisheries, industry, and tourism (UNDP, 2017; IHCantabria, 2017). The selection of these sites allows for a differentiated analysis representative of the diverse challenges across the delta: the Rosetta/Burullus area is defined by extreme coastal erosion following sediment reduction from the Aswan High Dam; Damietta presents a complex mosaic of urban, industrial, and agricultural land uses under threat; and Port Said, a major urban and economic hub at the entrance of the Suez Canal, faces one of the highest rates of relative SLR due to severe land subsidence. 2.2. An Integrated Framework for Financing NbS-Based Urban Resilience The core of this paper's methodology is a novel, four-stage analytical framework designed to systematically translate climate risks into a pipeline of bankable NbS projects. This framework provides a structured pathway for policymakers and project developers, moving logically from problem identification to financial mobilization. Each stage involves specific methods, data inputs, and measurable outputs that collectively build the investment case for NbS. The structure of the framework is detailed in Table 2 . Table 2 An Integrated Framework for Financing Nature-Based Solutions in the Nile Delta Stage Objective Methods Key Data Inputs Outputs Stage 1: Climate Risk & Vulnerability Assessment To quantify and map compound risks to urban systems. GIS-based spatial analysis; Flood modeling (using data from GOW, GOS, GOT databases); Economic valuation of assets at risk. Digital Elevation Models (DEMs), land use maps, SLR scenarios (RCP8.5), subsidence rates, socioeconomic data (UNDP, 2017; CoRI, 2012). Vulnerability and risk maps; quantitative estimates of potential economic losses ("cost of inaction"). Stage 2: NbS Prioritization & Design To identify and design the most effective and context-appropriate NbS for specific hotspots. Multi-Criteria Assessment (MCA) considering: technical feasibility, cost-effectiveness, resilience benefits, co-benefits (biodiversity, social). Catalogue of NbS interventions (soft dikes, dune restoration, wetland creation); construction specifications; local ecological conditions (UNDP, 2017; Kumar et al., 2020; IHCantabria, 2017). A prioritized portfolio of context-specific NbS projects with conceptual designs and technical specifications. Stage 3: Resilience Impact & Co-Benefit Quantification To measure the contribution of NbS to urban resilience and monetize their full spectrum of benefits. Cost-Benefit Analysis (CBA); Ecosystem service valuation; Resilience metrics (e.g., number of people protected, value of assets safeguarded, reduction in expected annual damages). Economic damage data (UNDP, 2017), ecological data (UNDP, 2017), global benefit valuation databases (World Bank, 2023; Ranger & van Raalte, 2023). Investment-grade business cases for each prioritized NbS project, including Return on Investment (ROI) and monetized co-benefits. Stage 4: Climate Finance Mapping & Structuring To align bankable NbS projects with suitable national and international financial instruments. Financial instrument analysis; Blended finance structuring; Policy and institutional review. GCF investment criteria, World Bank programs, private investor requirements, national budgetary processes (Climate Policy Initiative, 2024; World Bank, 2025; World Bank, 2023). A diversified financing strategy and investment plan for a portfolio of NbS projects. 2.3. Data Extraction and Analytical Methods The research is based on a comprehensive synthesis of data from technical assessments and supplemented with recent peer-reviewed literature. Primary data were drawn from feasibility studies conducted for the Green Climate Fund (GCF) and their annexes, which include detailed flood level assessments, specifications for soft engineering solutions, and economic valuations of flood impacts (UNDP, 2017; IHCantabria, 2017). This is complemented by Integrated Coastal Zone Management (ICZM) scoping studies, which provide extensive information on coastal processes, ecological assessments, and institutional frameworks (IHCantabria, 2017; IHCantabria, 2016). To fill conceptual gaps and ensure the framework aligns with current best practices, secondary data were sourced from scholarly articles (2018–2025) focusing on climate finance, NbS effectiveness, and urban resilience theory (Cohen-Shacham et al., 2016; Shirley et al., 2025; WWF, 2022; World Bank, 2023; World Bank, 2023). The analytical methods applied correspond to the stages of the integrated framework: GIS Spatial Analysis and Vulnerability Modeling (Stage 1) : The methodology outlined in GCF feasibility studies was replicated and extended to create high-resolution risk maps (UNDP, 2017). This involved layering geospatial data on compound hazards—including projected SLR under RCP8.5, local subsidence rates, and storm surge inundation levels from the Global Ocean Surges (GOS) database—onto maps of socioeconomic exposure. Exposure data included population density, land use (urban, agriculture, industrial), and the location of critical infrastructure. This process allowed for the precise identification of high-risk urban areas and the quantification of assets and populations within these zones. Multi-Criteria Assessment (MCA) (Stage 2) : To prioritize NbS interventions, a systematic MCA was developed. A catalogue of potential NbS interventions was compiled from technical documentation, including soft dikes, dune restoration, beach nourishment, and managed realignment (UNDP, 2017). Each potential solution was scored against a set of weighted criteria: (1) Flood Risk Reduction Effectiveness : ability to attenuate wave energy and reduce inundation depth; (2) Erosion Control : capacity to stabilize shorelines and trap sediment; (3) Cost-Effectiveness : estimated lifecycle cost compared to traditional gray infrastructure; (4) Implementation Feasibility : technical complexity and timeline; and (5) Co-Benefits : positive impacts on biodiversity, local livelihoods (e.g., fisheries, tourism), and carbon sequestration. Economic Valuation (Stage 3) : The financial viability of prioritized NbS was assessed using a comprehensive Cost-Benefit Analysis (CBA). The "costs" included capital expenditure for implementation and ongoing operation and maintenance. The "benefits" were quantified in two categories. First, the direct resilience benefits were calculated as the "avoided costs" of climate impacts, using the damage cost methodology and asset valuation data from the economic impact assessment (UNDP, 2017). This represents the value of property, infrastructure, and agricultural land protected from flooding and erosion. Second, the economic value of ecosystem service co-benefits was estimated using benefit-transfer methods, drawing on established values from global studies for services such as carbon sequestration in restored wetlands, enhanced fish nursery habitats, and increased tourism revenue from improved coastal aesthetics (World Bank, 2023; Ranger & van Raalte, 2023). 2.4. Validation The methodological framework and its outputs were validated to ensure their robustness and policy relevance. The identified risks and proposed NbS interventions were cross-referenced with the priorities outlined in Egypt's National Strategy for Adaptation to Climate Change and Disaster Risk Reduction (NSACC) and its Third National Communication (TNC) to the UNFCCC, confirming alignment with national policy objectives (UNDP, 2017; IHCantabria, 2017; EEAA, 2016). Furthermore, the proposed financial structuring strategies were benchmarked against the investment criteria and best practice guidelines of key international financial institutions, including the Green Climate Fund and the World Bank, to ensure the "bankability" of the resulting project concepts (ACCNDP, 2016; World Bank, 2025; World Bank, 2023). This dual validation process ensures that the framework is both scientifically sound and practically applicable within the current policy and financial landscape. 3. Results 3.1. Spatial Analysis of Compound Climate Risks in Nile Delta Hotspots Table 3 Projected Inundated Area in Vulnerable Coastal Units Study area Coastal Unit Projected Inundated Area (km²) 2050 Projected Inundated Area (km²) 2100 Kafr El-Sheikh (West Burullus inlet) CU3-SUB2 118.2 521.9 Port Said (West new Ashtom Elgamil) CU5-SUB1 14.7 355 Beheira (West Rosetta estuary) CU3-SUB1 5.06 571.8 Damietta (East of new Damietta city) CU4-SUB2 0.013 21.7 Dakahlia (West of new Gamasa city) CU4-SUB1 1.70 30.4 The application of the Stage 1 framework reveals the acute and spatially concentrated nature of climate risk across the Nile Delta's coastal hotspots (Table 3 ), and (Fig. 3). The GIS-based analysis, integrating global SLR projections with local subsidence data, confirms that the region faces a significantly accelerated rate of relative sea-level rise. Under the RCP8.5 scenario, a global SLR of $ 0.84 $ m by 2100 translates into a localized relative SLR exceeding $ 1.2 $ m in Port Said and approaching $ 1.0 $ m in the Burullus region. This amplified threat places vast areas of densely populated and economically vital land at risk of permanent inundation and increased flood frequency. Coastal erosion, driven by the sediment deficit from the Aswan High Dam and exacerbated by rising sea levels, poses a concurrent threat, with the highest rates observed near the Rosetta and Damietta promontories. In unprotected segments, shoreline retreat has been documented at rates exceeding 30 m/year, directly threatening coastal infrastructure and communities (IHCantabria, 2017). The economic implications of inaction are substantial. Applying established valuation methodologies, the projected damage to non-financial assets (including residential, commercial, and industrial infrastructure) from flooding and erosion runs into billions of Egyptian pounds for each key coastal unit. Table 4 synthesizes the risk profiles for the three primary hotspots, quantifying the scale of the threat to population, key economic assets, and the estimated financial cost of inaction by 2100. Table 4 Climate Risk Profile of Nile Delta Hotspots (Projected to 2100, RCP8.5) Hotspot (Governorate) Key Vulnerabilities Projected Relative SLR (m) Max. Erosion Rate (m/yr) Population at Risk Key Economic Assets at Risk Estimated Cost of Inaction (L.E. billion) Rosetta/Burullus (Kafr El Sheikh) Agriculture, Fisheries, Critical Infrastructure ~ $ 1.0 $ > 30 ~ 750,000 Burullus Power Plant, fertile agricultural lands, fishing ports, international coastal road > 150 Damietta Urban Centers, Industry, Agriculture, Port ~ $ 1.1 $ 15–25 ~ 500,000 Damietta Port, furniture industry clusters, urban areas, agricultural lands > 120 Port Said Major Urban Center, Port, Industry, Suez Canal > $ 1.2 $ 5–15 > 1,000,000 Port Said city, Suez Canal access channels, industrial zones, tourism infrastructure > 200 3.2. Prioritization and Design of Nature-Based Solutions The Multi-Criteria Assessment (MCA) conducted in Stage 2 of the framework yielded a portfolio of prioritized, context-specific NbS interventions tailored to the unique risk profiles and socio-ecological characteristics of each hotspot. The results, summarized in Table 3 , demonstrate a clear rationale for selecting different types of solutions for different areas. For the Burullus region , characterized by high wave energy and the presence of critical infrastructure like the Burullus power plant, the MCA ranked soft dikes with geotextile cores as the highest-priority intervention. This solution offers a high degree of flood protection and moderate erosion control at a reasonable cost. The design is based on successful pilot projects implemented under the ACCNDP, which have proven the technical feasibility of using sand-filled geotextile containers covered with a clay layer and rip-rap revetment to create resilient, yet flexible, coastal defenses (UNDP, 2017). In contrast, for the tourism-dependent coastal stretches near Damietta and the planned tourism developments in the North Sinai (El Arish) , the MCA prioritized dune restoration and stabilization . This approach scored highly on cost-effectiveness and co-benefits, as it not only provides moderate flood protection and excellent erosion control by trapping wind-blown sand but also restores the natural landscape, enhancing the aesthetic and recreational value crucial for the tourism sector. The proposed design involves using sand-trapping fences and planting native vegetation to rebuild and stabilize the dune systems, a technique also tested and recommended in previous ICZM scoping analyses (UNDP, 2017; IHCantabria, 2017). For low-lying agricultural lands situated behind the primary coastline, particularly in the hinterlands of the Rosetta and Manzala lagoons, wetland restoration and managed realignment were identified as highly effective long-term solutions. These interventions create natural buffer zones that can absorb and retain large volumes of floodwater, reduce nutrient runoff from agricultural fields, and restore critical habitats for fisheries and biodiversity (Table 5 ), and (Fig. 4). While politically complex to implement due to land-use trade-offs, they offer very high co-benefits and long-term resilience at a high level of cost-effectiveness (UNDP, 2017). Table 5 Multi-Criteria Assessment of Prioritized NbS Interventions NbS Intervention Hotspot Application Flood Risk Reduction Erosion Control Cost-Effectiveness Co-Benefits (Biodiversity, Social) Overall Priority Score Soft Dikes (Geotextile Core) Burullus, Damietta (Industrial) High Moderate Moderate Low High Dune Restoration & Stabilization Damietta, Port Said (Tourism) Moderate High High High High Wetland Restoration Rosetta, Manzala (Hinterland) High Low High Very High Moderate (Long-term) Managed Realignment Low-value agricultural land Very High N/A High Very High Low (Politically Complex) 3.3. Financial Viability and Co-Benefit Analysis The Cost-Benefit Analysis (CBA) from Stage 3 of the framework demonstrates a compelling financial case for investing in the prioritized NbS portfolio. When the full spectrum of benefits is quantified, the economic returns of NbS interventions significantly outweigh their implementation and maintenance costs. The direct resilience benefits, calculated as the avoided damages to assets and economic activity, are substantial. For instance, the "Enhancing Climate Change Adaptation in the North Coast of Egypt" project, with a budget of approximately $ 105 million for constructing 70 km of nature-based dikes and other measures, is designed to protect assets and economic activities valued in the billions of Egyptian pounds (GCF, 2017; UNDP, 2017). Global analyses confirm that NbS can be up to 50% more cost-effective than purely gray infrastructure alternatives over their lifecycle, particularly when maintenance costs are considered (UNEP FI, 2023). The inclusion of monetized co-benefits further strengthens the investment case. For example, the restoration of coastal wetlands near Lake Manzala not only provides flood storage but also enhances fish nursery habitats, which supports the local fishing industry—a significant contributor to the regional economy. Similarly, dune restoration projects enhance the aesthetic appeal of coastal areas, directly contributing to the sustainability and growth of the tourism sector. Studies have shown that investments in urban NbS, such as green spaces and wetlands, can generate returns on investment of three-to-one or higher when health, recreational, and biodiversity benefits are accounted for (Ranger & van Raalte, 2023). By quantifying these co-benefits—such as carbon sequestration, improved water quality, and enhanced biodiversity—the CBA reveals that NbS projects are not merely cost centers for protection but are productive investments that generate multiple, cross-sectoral revenue streams and societal value, making them highly attractive for blended finance models that can capture value for different stakeholders (World Bank, 2023; Saleh, 2018). 4. Discussion 4.1. An Integrated Framework to Unlock Climate Finance The primary contribution of this research is the development of an integrated framework that systematically addresses the "bankability" problem hindering the large-scale implementation of NbS in Egypt. The framework creates a clear, evidence-based narrative that connects financial investment to measurable resilience outcomes, a critical step for unlocking climate finance. By translating physical risks like erosion and flooding into financial risks—such as asset loss, business interruption, and impacts on GDP—it frames the adaptation challenge in a language that resonates with finance ministries and private investors (WWF, 2022). Stage 3 of the framework, which quantifies both the avoided damages and the monetized co-benefits, demonstrates that NbS projects can offer a positive return on investment, directly countering the perception that they are high-risk, low-return ventures. This structured approach provides the analytical rigor needed to develop robust project proposals capable of meeting the stringent criteria of international financial institutions like the GCF and attracting private capital through blended finance instruments, guarantees, and green bonds (Climate Policy Initiative, 2024; Saleh, 2018). 4.2. Overcoming Institutional Barriers to Implementation in Egypt Beyond its financial utility, the framework serves as a practical tool for overcoming the deep-seated institutional barriers that have stymied effective coastal management in Egypt. The country's coastal governance has long been characterized by fragmentation, with different ministries and authorities operating in silos, leading to uncoordinated and often contradictory actions (UNDP, 2017; IHCantabria, 2017). The framework's integrated, data-driven process acts as a forcing mechanism for collaboration. For example, the GIS modeling in Stage 1 requires data sharing between the Ministry of Water Resources and Irrigation (hydrological data), the Ministry of Environment (ecological data), and local governorates (land use and planning data) (Fig. 5 ). Similarly, the multi-criteria assessment in Stage 2 necessitates a joint prioritization process, compelling different agencies to negotiate trade-offs and align their objectives within a common analytical structure. This process directly addresses the barriers identified in national assessments and scoping studies, as detailed in Table 6 . By providing a common, evidence-based language and a shared set of priorities, the framework can help operationalize Egypt's national ICZM strategy and empower coordinating bodies like the National Committee for ICZM (NCICZM), which have historically struggled to enforce inter-agency cooperation (IHCantabria, 2017; EEAA, 2016). It transforms the abstract goal of "integration" into a concrete, step-by-step workflow. Table 6 Policy and Financial Barriers to NbS Implementation in Egypt and Framework-Based Solutions Barrier Source Solution Provided by Integrated Framework Institutional Fragmentation / Lack of Coordination (UNDP, 2017; IHCantabria, 2017) Stage 1 & 2 require cross-ministerial data sharing and joint prioritization, fostering collaboration around a common analytical platform. Lack of Bankable Projects / Weak Financial Case (WWF, 2022) Stage 3 & 4 are explicitly designed to produce investment-grade business cases and map them to suitable financial instruments. Weak Evidence Base on NbS Effectiveness & Benefits (Seddon et al., 2020) Stage 3 quantifies both direct resilience benefits (avoided damages) and monetized co-benefits, providing a robust evidence base for decision-making. Dominance of "Gray" Path Dependency (UNDP, 2017; Seddon et al., 2020) The Cost-Benefit Analysis in Stage 3 demonstrates the superior lifecycle cost-effectiveness of NbS and hybrid solutions, creating a strong financial incentive to shift away from purely gray options. 4.3. From Project-Based Interventions to Systemic Coastal Resilience A key implication of this framework is its potential to shift Egypt's coastal adaptation strategy from a reactive, project-by-project approach to a proactive, systemic model of resilience-building. The current paradigm, often driven by disaster response, has led to a patchwork of isolated hard engineering projects that fail to address the underlying drivers of vulnerability and can lead to maladaptation. The framework, by contrast, promotes a holistic and long-term perspective consistent with the principles of ICZM (IHCantabria, 2017). It encourages planners to consider the entire coastal system, including the interplay between natural processes and human activities. Furthermore, it explicitly allows for the design and evaluation of hybrid "green-gray" infrastructure, where NbS are integrated with existing or new engineered structures to create more resilient and cost-effective systems (Pathak et al., 2024; Shirley et al., 2025). For example, restoring a beach and dune system in front of an existing seawall can dissipate wave energy, reducing stress on the hard structure, extending its lifespan, and lowering maintenance costs, while also restoring ecological and recreational value. By mainstreaming this integrated approach into national and municipal planning cycles, the framework can help break the cycle of maladaptation and foster a more sustainable and resilient coastal governance model. 4.4. Global Implications for Vulnerable Delta Cities The challenges confronting the Nile Delta—compounding risks from SLR and subsidence, rapid urbanization, and institutional barriers to adaptation—are not unique. They are emblematic of the crises facing other major deltaic systems across the developing world, such as the Mekong Delta in Vietnam and the Ganges-Brahmaputra Delta in Bangladesh (Agrawala et al., 2004; Baker, 2012). These regions share similar vulnerabilities and face comparable difficulties in accessing the climate finance needed to implement large-scale adaptation. The modular and scalable design of the proposed framework makes it highly replicable. Its four-stage process can be adapted to different socio-ecological contexts and data availability levels. As such, it offers a transferable model for other developing countries seeking to build a robust, evidence-based pipeline of bankable NbS projects. By demonstrating a clear pathway to translate adaptation needs into fundable actions, this research contributes to the global discourse on operationalizing climate finance and scaling up NbS to protect the world's most vulnerable coastal communities (World Bank, 2025; World Bank, 2023). 5. Conclusion The Nile Delta's urban coastal zones are at a critical juncture, facing existential threats from a confluence of climate-driven and anthropogenic pressures. This paper argued that the prevailing adaptation response, characterized by a reliance on localized hard engineering, is insufficient and often maladaptive. A paradigm shift towards the large-scale implementation of Nature-Based Solutions is essential for building long-term, systemic resilience. However, this shift is currently stalled by a critical disconnect between high-level policy ambitions, the availability of international climate finance, and the on-the-ground capacity to develop bankable projects. The integrated analytical framework developed and applied in this research provides a viable pathway to break this deadlock. By systematically linking climate risk assessment, NbS prioritization, economic valuation, and financial structuring, the framework creates a clear, evidence-based methodology for translating adaptation needs into investment-grade opportunities. The findings demonstrate that not only are NbS technically feasible for the Nile Delta's specific challenges, but they are also financially viable, often presenting a more cost-effective solution than traditional infrastructure when their full range of co-benefits is considered. The core logic for scaling climate finance for NbS in the Nile Delta, as illuminated by the framework, is to build a compelling and de-risked investment case. This involves several strategic pathways: From Hazard to Financial Risk : The first step is to reframe the climate challenge in financial terms. Robust, data-driven vulnerability assessments that quantify the economic value of assets at risk and the potential GDP impacts of inaction are essential for gaining the attention of finance ministries and private investors. Building the Business Case for Nature : Comprehensive Cost-Benefit Analyses that monetize the full spectrum of NbS benefits—including direct protection (avoided damages) and indirect co-benefits (ecosystem services)—are crucial. This demonstrates that NbS are not simply environmental expenditures but are productive investments that generate tangible economic returns across multiple sectors. Developing a Portfolio Approach : Rather than seeking funding for isolated projects, the framework enables the development of a diversified portfolio of NbS interventions. This approach allows for the bundling of projects to achieve the scale necessary to attract institutional investors and allows for the blending of different financial instruments (e.g., concessional loans for infrastructure-like components, grants for capacity building, and private equity for revenue-generating co-benefits). Leveraging Public Finance to Catalyze Private Investment : The framework helps identify where public funds, including international climate finance, can be used most catalytically. This includes funding for the initial stages of project development (risk assessment, feasibility studies) and using public capital to de-risk investments for the private sector through mechanisms like first-loss guarantees or concessional debt. To operationalize these pathways and accelerate the transition to resilient coastal management, the following policy actions are recommended: For the Government of Egypt (Ministry of Water Resources and Irrigation, Ministry of Environment) : Adopt the Integrated Framework : Formally adopt the four-stage framework as a standard methodology for all coastal adaptation planning and project development. Mandate for ICZM : Mandate the use of this framework in the development and implementation of the National Integrated Coastal Zone Management (ICZM) plan to ensure it is evidence-based and financially sound. Establish an NbS Project Pipeline Unit : Create a dedicated inter-ministerial task force, with technical and financial expertise, responsible for using the framework to build and manage a national pipeline of bankable NbS projects ready for domestic and international financing. For International Financial Institutions (Green Climate Fund, World Bank, African Development Bank) : Fund Upstream Project Preparation : Prioritize funding for technical assistance facilities that support developing countries like Egypt in applying such integrated frameworks. This "upstream" investment in project preparation is critical for creating a pipeline of high-quality, fundable projects. Develop Tailored Financial Instruments : Design and deploy financial instruments specifically tailored to the risk-return profile of large-scale NbS. This includes expanding the use of blended finance facilities, offering long-term concessional financing, and providing guarantees to mitigate perceived risks for private investors. For Municipal Authorities (e.g., Governorates of Alexandria, Port Said, Damietta) : Integrate NbS into Urban Planning : Mainstream the outputs of the framework's risk assessments and NbS prioritization into local urban master plans, land-use regulations, and infrastructure investment strategies. Build Local Capacity : Invest in building the technical capacity of municipal planning and engineering departments to design, implement, and maintain NbS and hybrid green-gray infrastructure projects. While this paper provides a strategic framework, further research is needed to refine its application and address remaining knowledge gaps. An agenda for future research should include: Long-Term Performance Monitoring : Establishing long-term monitoring programs for implemented NbS projects in the Nile Delta to gather empirical data on their performance, effectiveness, and maintenance costs under real-world environmental conditions. Innovative Financial Models : Investigating the feasibility of more advanced financial instruments for funding coastal resilience in Egypt, such as resilience bonds, debt-for-nature swaps, and dedicated natural capital funds. Socio-Political Dynamics : Conducting in-depth socio-political analysis of the challenges and opportunities associated with implementing large-scale adaptation projects, particularly those involving land-use changes like managed realignment, to develop effective governance and stakeholder engagement strategies. Scaling and Replication : Applying the framework to other vulnerable coastal cities and deltaic regions to test its adaptability and refine its components, thereby contributing to a global knowledge base on financing nature-based urban resilience. Declarations Ethical Approval: Not applicable. This study did not involve human participants or animal experiments. Consent to Participate: Not applicable. Consent to Publish: All authors have read and approved the final version of the manuscript and consent to its publication in Discover Sustainability. Clinical Trial Number Not applicable. Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Funding: This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors. Author Contribution T.O conceptualized the study, developed the analytical framework, and led the manuscript writing and revisions. T.O and A.N contributed to data collection, GIS-based analysis, and financial assessment. Both authors read and approved the final manuscript. Data Availability The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request. References Abdrabo, M.A. and Hassaan, M.A. (2015) 'An integrated framework for assessing vulnerability of the Nile Delta coastal areas to inundation by sea level rise', Environment, Development and Sustainability , 17(4), pp. 849–865. Adaptation to Climate Change in the Nile Delta through Integrated Coastal Zone Management Project (ACCNDP) (2016) The Integrated Coastal Zone Management (ICZM) in Egypt – a Scoping Study . IHCantabria. Agrawala, S., Moehner, A., El Raey, M., Conway, D., van Aalst, M. and Hagenstad, M. (2004) Development and climate change in Egypt: Focus on coastal resources and the Nile . Paris: Organisation for Economic Co-operation and Development. Baker, J.L. (ed.) (2012) Climate change, disaster risk, and the urban poor: Cities building resilience for a changing world . Washington, D.C.: The World Bank. Balzan, M.V., et al. (2022) 'Overcoming barriers to the implementation of nature-based solutions in the Mediterranean', Environmental Science & Policy , 136, pp. 146-156. Carnegie Endowment for International Peace (2023) Climate change in Egypt: Opportunities and obstacles . Climate Policy Initiative (2024) Toolbox on financing nature-based solutions . Cohen-Shacham, E., Walters, G., Janzen, C. and Maginnis, S. (eds.) (2016) Nature-based solutions to address global societal challenges . Gland, Switzerland: IUCN. Coastal Research Institute (CoRI) (2012) Head master initiative for the Nile Delta coastal hydrodynamics, sediment transport, erosion, and defense schemes in view of climate change and ICZM . Ministry of Water Resources and Irrigation. Credit Suisse Research Institute (2022) Global wealth databook 2022 . Dasgupta, S., Laplante, B., Meisner, C., Wheeler, D. and Yan, J. (2009) 'The impact of sea level rise on developing countries: A comparative analysis', Climatic Change , 93(3-4), pp. 379–388. Depsky, N., et al. (2023) 'Valuing the costs of managed retreat', Nature Climate Change , 13, pp. 1172–1174. Dickson, E., et al. (2022) Urban risk assessments: Understanding disaster and climate risk in cities . Washington, D.C.: World Bank. Dorst, H., et al. (2022) 'A systemic approach to understanding and overcoming barriers to mainstreaming nature-based solutions in urban planning', Ambio , 51(5), pp. 1185-1198. Egyptian Environmental Affairs Agency (EEAA) (2016) Egypt's third national communication report under the United Nations Framework Convention on Climate Change . El-Raey, M., Dewidar, K. and El-Hattab, M. (1999) 'Adaptation to the impacts of sea level rise in Egypt', Mitigation and Adaptation Strategies for Global Change , 4(3-4), pp. 343–361. Esteves, L.S. (2014) Coastal management . John Wiley & Sons. Faivre, N., et al. (2017) 'Nature-based solutions in the EU: Innovating with nature to address social, economic and environmental challenges', Environmental Research , 159, pp. 509-518. Fanchette, S. (2025) 'Delta vulnerability linked to climate and environmental changes: Metropolization challenges in Asian and Nile deltas', in **. Frihy, O.E. and El-Sayed, M.K. (2013) 'Vulnerability risk assessment and adaptation to climate change induced sea level rise along the Mediterranean coast of Egypt', Mitigation and Adaptation Strategies for Global Change , 18(8), pp. 1215–1237. Green Climate Fund (GCF) (2017) Funding Proposal: Enhancing Climate Change Adaptation in the North Coast and Nile Delta Regions in Egypt (FP053) . Griscom, B.W., et al. (2017) 'Natural climate solutions', Proceedings of the National Academy of Sciences , 114(44), pp. 11645–11650. Haddad, E.A., et al. (2025) 'Deluge of costs: Navigating the economic impacts of flooding in Egyptian port cities', Global Challenges & Regional Science , 3, 100015. Hassan, M.A. and Abdrabo, M.A. (2013) 'Vulnerability of the Nile Delta coastal areas to inundation by sea level rise', Environmental Monitoring and Assessment , 185(8), pp. 6607–6616. Hereher, M.E. (2015) 'Coastal vulnerability assessment for Egypt's Mediterranean coast', Geomatics, Natural Hazards and Risk , 6(4), pp. 342–355. IHCantabria (2016) ICZM in the Northern Coast of Egypt - A Scoping Study. Technical Evaluation Report . UNDP. IHCantabria (2017) ICZM Scoping Study in the Northern Coast of Egypt: Volume I Final Study Report . UNDP. Intergovernmental Panel on Climate Change (IPCC) (2019) IPCC special report on the ocean and cryosphere in a changing climate . Intergovernmental Panel on Climate Change (IPCC) (2021) Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report . Cambridge: Cambridge University Press. Intergovernmental Panel on Climate Change (IPCC) (2022) Climate Change 2022: Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Sixth Assessment Report . Cambridge: Cambridge University Press. Kibii, C., et al. (2025) Nature-based solutions for climate change adaptation and resilience in urban informal settlements: Insights from Kenya and Argentina . WeAdapt. Kumar, P., et al. (2020) 'Towards a sustainable and resilient future: A review of nature-based solutions for coastal protection', Journal of Environmental Management , 269, 110759. McBean, E. and Huang, G. (2017) 'Sustainability risks of coastal cities from climate change', The Global Environmental Engineers , 4(1), pp. 1-10. Meerow, S., Newell, J.P. and Stults, M. (2016) 'Defining urban resilience: A review', Landscape and Urban Planning , 147, pp. 38–49. Narayan, S., et al. (2016) 'The effectiveness, costs and coastal protection benefits of natural and nature-based defences', PloS one , 11(5), e0154735. Nesshöver, C., et al. (2017) 'The science, policy and practice of nature-based solutions: An interdisciplinary perspective', Science of the Total Environment , 579, pp. 1215–1227. Pathak, A., Glick, P., et al. (2024) Incorporating nature-based solutions into community climate adaptation planning . Climate Resilience Fund. Ranger, N. and van Raalte, D. (2023) Financing nature-based solutions for adaptation . Global Center on Adaptation & University of Oxford. Ranasinghe, P.R. (2025) Nature-based solutions for urban climate resilience: Assessment . University of Texas at Arlington. Saleh, M. (2018) Climate change impacts on Egypt's coastal cities: The case of Alexandria . American University in Cairo. Seddon, N., et al. (2020) 'Understanding the value and limits of nature-based solutions to climate change and other global challenges', Philosophical Transactions of the Royal Society B , 375(1794), 20190120. Shirley, R., Onyango, S., Manyifika, M. and Takele, E. (2025) Financing urban resilience: Making nature-based solutions central to Africa's development agenda . World Resources Institute. Stockholm Environment Institute (SEI) (2022) Assessing finance for nature-based solutions . Temmerman, S., et al. (2013) 'Ecosystem-based coastal defence in the face of global change', Nature , 504(7478), pp. 79–83. United Nations Development Programme (UNDP) (2017) Feasibility study for integrated climate change adaptation in five vulnerable hotspots in the Nile Delta . United Nations Environment Programme (UNEP) (2023) State of finance for nature . United Nations Environment Programme Finance Initiative (UNEP FI) (2023) Nature-based solutions in urban areas: A primer for financial institutions . World Bank (2022) Egypt country climate and development report (CCDR) . World Bank (2023) Assessing the benefits and costs of nature-based solutions for climate resilience: A guideline for project developers . World Bank (2025) Mobilizing nature-based solutions (NBS) for disaster and climate resilience . WWF (2022) Financing nature-based solutions: A guide for practitioners . Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7979335","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":545899127,"identity":"c9e98992-2467-4b79-987a-9bd4b58aa4bf","order_by":0,"name":"Taher 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11:57:19","extension":"xml","order_by":27,"title":"","display":"","copyAsset":false,"role":"acdc-reference","size":102326,"visible":true,"origin":"","legend":"","description":"","filename":"9061dc846f3d4522aa2751556b27c2fa1structuring.xml","url":"https://assets-eu.researchsquare.com/files/rs-7979335/v1/b5b330c7528a6ccbd7112d08.xml"},{"id":96363448,"identity":"e3f714b1-7370-4916-9acc-d96084b41a0f","added_by":"auto","created_at":"2025-11-20 10:06:56","extension":"html","order_by":28,"title":"","display":"","copyAsset":false,"role":"acdc-reference","size":110846,"visible":true,"origin":"","legend":"","description":"","filename":"earlyproof.html","url":"https://assets-eu.researchsquare.com/files/rs-7979335/v1/37644b1f42c81bd940ee8169.html"},{"id":96285369,"identity":"6459d523-d8fc-4f63-8390-819bfba5d8f2","added_by":"auto","created_at":"2025-11-19 11:57:19","extension":"png","order_by":1,"title":"Figure 1","display":"","copyAsset":false,"role":"figure","size":153151,"visible":true,"origin":"","legend":"\u003cp\u003eMethodology Chart\u003c/p\u003e","description":"","filename":"1.png","url":"https://assets-eu.researchsquare.com/files/rs-7979335/v1/d467b83dfb736223058b79d6.png"},{"id":96285373,"identity":"daa0e659-cede-4c29-bcb3-6bf20cdf70d5","added_by":"auto","created_at":"2025-11-19 11:57:19","extension":"png","order_by":2,"title":"Figure 2","display":"","copyAsset":false,"role":"figure","size":1285439,"visible":true,"origin":"","legend":"\u003cp\u003ethe study area\u003c/p\u003e","description":"","filename":"2.png","url":"https://assets-eu.researchsquare.com/files/rs-7979335/v1/6c524fa1f7d2acda0c90cb18.png"},{"id":96285370,"identity":"3385ca2a-be7f-45dd-9bd9-46eeed9343f5","added_by":"auto","created_at":"2025-11-19 11:57:19","extension":"png","order_by":3,"title":"Figure 3","display":"","copyAsset":false,"role":"figure","size":596935,"visible":true,"origin":"","legend":"\u003cp\u003eThe inundation under scenarios SSP2-8.5 in the study areas\u003c/p\u003e","description":"","filename":"3.png","url":"https://assets-eu.researchsquare.com/files/rs-7979335/v1/ea8f469a3ea651d219810b69.png"},{"id":96285372,"identity":"c31abbc5-08e5-4bd2-a043-546e6c80daa2","added_by":"auto","created_at":"2025-11-19 11:57:19","extension":"png","order_by":4,"title":"Figure 4","display":"","copyAsset":false,"role":"figure","size":1389601,"visible":true,"origin":"","legend":"\u003cp\u003ePatterns of Nature based solutions in the Nile Delata coastal Zone\u003c/p\u003e","description":"","filename":"4.png","url":"https://assets-eu.researchsquare.com/files/rs-7979335/v1/ee1f23334604b45f88cbeb6a.png"},{"id":96285375,"identity":"6c6b98f8-719a-40aa-b8c2-0fa9a8636f2e","added_by":"auto","created_at":"2025-11-19 11:57:19","extension":"png","order_by":5,"title":"Figure 5","display":"","copyAsset":false,"role":"figure","size":394727,"visible":true,"origin":"","legend":"\u003cp\u003eThe Land use / Land Cover in The Nile Delta Coastal Zone\u003c/p\u003e","description":"","filename":"5.png","url":"https://assets-eu.researchsquare.com/files/rs-7979335/v1/1e995c3acc007dc02c63ea12.png"},{"id":98622050,"identity":"017fb1e6-00d4-40fc-8c8d-e14b5841a0b7","added_by":"auto","created_at":"2025-12-19 16:43:20","extension":"pdf","order_by":0,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":5742397,"visible":true,"origin":"","legend":"","description":"","filename":"manuscript.pdf","url":"https://assets-eu.researchsquare.com/files/rs-7979335/v1/06a6f3e8-6b04-43b8-a72a-5013824cb394.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Leveraging Climate Finance to Integrate Nature-Based Solutions for Urban Resilience in Nile Delta Vulnerable Coastal Zones","fulltext":[{"header":"1. Introduction","content":"\u003cp\u003eThe Nile Delta is one of the world's most vulnerable deltaic systems to the impacts of climate change (Abdrabo \u0026amp; Hassaan, 2015; ACCNDP, 2016). Its low-lying topography, combined with high population density and significant economic activity, creates a precarious socio-ecological system under increasing threat (Dickson et al., 2022; Fanchette, 2025). The region faces a confluence of reinforcing hazards that create a state of compound risk, where the total impact is greater than the sum of its parts. Global mean sea-level rise (SLR), projected to reach between \u003cspan\u003e$\u003c/span\u003e0.61\u003cspan\u003e$\u003c/span\u003e m and \u003cspan\u003e$\u003c/span\u003e1.10\u003cspan\u003e$\u003c/span\u003e m by 2100 under the high-emissions scenario RCP8.5, represents a primary threat (IPCC, 2019). However, this global figure is significantly amplified at the local level by severe land subsidence. Data from tide gauges indicate that parts of the delta are sinking at rates up to 5.3 mm/year, particularly in the vicinity of Port Said (CoRI, 2012; Dasgupta et al., 2009).\u003c/p\u003e\u003cp\u003eThis convergence of global SLR and local subsidence results in a multiplicative, rather than additive, effect on relative sea-level rise. A global SLR of \u003cspan\u003e$\u003c/span\u003e0.84\u003cspan\u003e$\u003c/span\u003e m could translate to a local relative sea-level rise of over \u003cspan\u003e$\u003c/span\u003e1.3\u003cspan\u003e$\u003c/span\u003e m in the most affected areas by 2100. This dramatically shortens the timeline for catastrophic impacts and renders adaptation plans based solely on global SLR projections dangerously conservative for local-level planning. The physical consequences of this accelerated relative SLR are already evident. Coastal erosion is rampant, with shoreline retreat rates exceeding 30 m/year in unprotected areas, particularly around the Rosetta and Damietta promontories, which have been sediment-starved since the construction of the Aswan High Dam (IHCantabria, 2017; CoRI, 2012). This erosion, coupled with increased frequency and intensity of storm surges, leads to recurrent coastal flooding and progressive saltwater intrusion into the delta's vital freshwater aquifer, threatening agricultural productivity and drinking water supplies (Carnegie Endowment for International Peace, 2023; El-Raey et al., 1999; Frihy \u0026amp; El-Sayed, 2013).\u003c/p\u003e\u003cp\u003eThese physical hazards converge on a region of immense socioeconomic importance to Egypt. The Nile Delta hosts over half of the nation's economic activity, accounts for 30\u0026ndash;40% of its agricultural production, and is home to major urban and industrial centers, including Alexandria, Port Said, and Damietta (Abdrabo \u0026amp; Hassaan, 2015; Agrawala et al., 2004; Hassan \u0026amp; Abdrabo, 2013). A significant portion of this population and economic infrastructure is concentrated in Low Elevation Coastal Zones (LECZs), defined as areas less than 10 meters above sea level, creating a \"perfect storm\" of high exposure and acute vulnerability (Dasgupta et al., 2009; Carnegie Endowment for International Peace, 2023). Projections indicate that a 1 m SLR could inundate approximately 20% of the delta, displacing over 6\u0026nbsp;million people and causing catastrophic economic damage (ACCNDP, 2016; El-Raey et al., 1999; IPCC, 2022).\u003c/p\u003e\u003cp\u003eHistorically, Egypt's response to coastal threats has been dominated by a reliance on \"gray\" or hard engineering structures, such as seawalls, revetments, and groynes (UNDP, 2017; IHCantabria, 2017). While providing localized protection, this approach has often proven to be maladaptive in the long term. Hard structures frequently reflect wave energy and interrupt longshore sediment transport, leading to exacerbated erosion in adjacent, downdrift areas. This creates a cascading problem that necessitates the construction of ever-more-extensive and costly defenses, locking the coastline into a rigid and unsustainable management cycle (UNDP, 2017; IHCantabria, 2017). Furthermore, these structures degrade the natural and aesthetic value of the coastline, negatively impacting tourism and destroying coastal habitats.\u003c/p\u003e\u003cp\u003eIn recognition of these limitations, there has been a notable policy shift towards embracing \"soft engineering\" or Nature-Based Solutions (NbS). Egypt's National Strategy for Adaptation to Climate Change and Disaster Risk Reduction (NSACC) and its Third National Communication (TNC) to the UNFCCC explicitly call for the integration of soft protection measures (UNDP, 2017; GCF, 2017; Kumar et al., 2020). NbS are defined by the International Union for Conservation of Nature (IUCN) as \"actions to protect, sustainably manage, and restore natural or modified ecosystems, that address societal challenges effectively and adaptively, simultaneously providing human well-being and biodiversity benefits\" (Cohen-Shacham et al., 2016; Stockholm Environment Institute (SEI), 2022). In the coastal context, this includes interventions such as restoring and stabilizing sand dunes, rehabilitating coastal wetlands and salt marshes to act as natural buffers, and constructing \"soft\" dikes using natural materials that mimic ecosystem functions (Pathak et al., 2024; IHCantabria, 2017).\u003c/p\u003e\u003cp\u003eDespite this high-level policy endorsement, the transition to NbS has stalled. On-the-ground implementation remains largely confined to small-scale pilot projects, such as the testing of soft dike designs in Mastroh under the Adaptation to Climate Change in the Nile Delta through Integrated Coastal Zone Management Project (ACCNDP) (UNDP, 2017). The paradigm shift from gray to green infrastructure is currently more aspirational than operational. The underlying cause of this inertia is not a lack of technical knowledge but a systemic failure to bridge the gap between policy intent and the financial and institutional mechanisms required for large-scale implementation. This stalled transition represents the central problem this paper seeks to address, moving beyond identifying the problem to proposing a structured solution.\u003c/p\u003e\u003cp\u003eThe global climate finance architecture has expanded significantly, with substantial capital available for adaptation projects in developing nations. Multilateral funds like the Green Climate Fund (GCF), programs led by the World Bank, and innovative blended finance models are actively seeking to fund NbS, with billions of dollars committed to nature-related resilience projects (ACCNDP, 2016; Shirley et al., 2025; Climate Policy Initiative, 2024; World Bank, 2025). In Africa alone, nearly 300 new resilience projects based on nature secured over \u003cspan\u003e$\u003c/span\u003e21\u0026nbsp;billion between 2012 and 2023 (Shirley et al., 2025).\u003c/p\u003e\u003cp\u003eHowever, a persistent implementation gap prevents this capital from flowing at the scale and pace required. Globally, the financing gap for nature protection exceeds \u003cspan\u003e$\u003c/span\u003e700\u0026nbsp;billion annually, with private finance constituting a mere 14% of the total investment in NbS (WWF, 2022). The primary barriers are not a scarcity of funds but a scarcity of \"bankable\" projects. Investors, both public and private, cite several key obstacles: a weak evidence base on the financial returns and long-term effectiveness of NbS; the novelty and perceived risk of these approaches compared to conventional engineering; and a lack of projects that are designed at a scale sufficient to attract large-scale institutional investment (WWF, 2022; Seddon et al., 2020).\u003c/p\u003e\u003cp\u003eThis \"bankability\" problem is fundamentally an institutional failure. In the context of Egypt's coastal management, identified weaknesses such as poor inter-agency coordination, fragmented planning processes, and inadequate data sharing directly inhibit the development of the large-scale, technically sound, and financially viable NbS proposals that investors require (UNDP, 2017; IHCantabria, 2017; EEAA, 2016). Therefore, unlocking climate finance for the Nile Delta is not merely a financial challenge; it is a challenge of institutional reform and strategic planning. It requires a systematic process for identifying risks, designing effective solutions, quantifying their benefits, and presenting them in a format that meets the rigorous standards of international financiers.\u003c/p\u003e\u003cp\u003eThe objective of this paper is to develop and apply an integrated analytical framework that directly links climate finance mechanisms to the planning, prioritization, and implementation of NbS for urban resilience in the Nile Delta's vulnerable coastal zones. This research moves beyond descriptive accounts of climate vulnerability to propose a structured, replicable methodology for creating a pipeline of bankable, large-scale NbS investment opportunities.\u003c/p\u003e\u003cp\u003eThe novelty of this contribution lies in its deliberate synthesis of three traditionally siloed domains: (1) climate finance and investment appraisal; (2) ecological engineering and NbS design; and (3) urban resilience and spatial planning. By creating a logical pathway from risk assessment to financial structuring, the framework provides a practical tool for policymakers and project developers. It is designed to support the achievement of Egypt's national adaptation goals, as well as its commitments under the Sustainable Development Goals (SDGs), particularly SDG 11 (Sustainable Cities and Communities) and SDG 13 (Climate Action). In doing so, it offers a potential model for other climate-vulnerable deltaic regions worldwide that face similar challenges in translating adaptation needs into fundable actions.\u003c/p\u003e"},{"header":"2. Methodology","content":"\u003cp\u003e\u003c/p\u003e\u003cdiv id=\"Sec3\" class=\"Section2\"\u003e\u003ch2\u003e2.1. Study Area\u003c/h2\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003e\u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"Yes\" id=\"Tab1\" border=\"1\"\u003e\u003ccaption language=\"En\"\u003e\u003cdiv class=\"CaptionNumber\"\u003eTable 1\u003c/div\u003e\u003cdiv class=\"CaptionContent\"\u003e\u003cp\u003ethe attribute of the five critical hotspots along the Nile Delta coast\u003c/p\u003e\u003c/div\u003e\u003c/caption\u003e\u003ccolgroup cols=\"10\"\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c1\" colnum=\"1\"\u003e\u003c/div\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c2\" colnum=\"2\"\u003e\u003c/div\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c3\" colnum=\"3\"\u003e\u003c/div\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c4\" colnum=\"4\"\u003e\u003c/div\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c5\" colnum=\"5\"\u003e\u003c/div\u003e\u003cdiv align=\"char\" char=\".\" class=\"colspec\" colname=\"c6\" colnum=\"6\"\u003e\u003c/div\u003e\u003cdiv align=\"char\" char=\".\" class=\"colspec\" colname=\"c7\" colnum=\"7\"\u003e\u003c/div\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c8\" colnum=\"8\"\u003e\u003c/div\u003e\u003cdiv align=\"char\" char=\".\" class=\"colspec\" colname=\"c9\" colnum=\"9\"\u003e\u003c/div\u003e\u003cdiv align=\"char\" char=\".\" class=\"colspec\" colname=\"c10\" colnum=\"10\"\u003e\u003c/div\u003e\u003cthead\u003e\u003ctr\u003e\u003cth align=\"left\" colname=\"c1\"\u003e\u003cp\u003eArea No.\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c2\"\u003e\u003cp\u003eGovernorate / Area\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c3\"\u003e\u003cp\u003eLocation\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c4\"\u003e\u003cp\u003eCoordinates (From \u0026ndash; To)\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c5\"\u003e\u003cp\u003eVulnerability Criteria\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c6\"\u003e\u003cp\u003eLand Subsidence (mm/yr)\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c7\"\u003e\u003cp\u003eNatural Ground Level (m)\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c8\"\u003e\u003cp\u003eProposed Site / Design Model(s)\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c9\"\u003e\u003cp\u003eLength of Protection (km)\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c10\"\u003e\u003cp\u003eAverage Cost (Million EGP)\u003c/p\u003e\u003c/th\u003e\u003c/tr\u003e\u003c/thead\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e1\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003eKafr Elsheikh (Area 1)\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eWest Burullus inlet\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c4\"\u003e\u003cp\u003eFrom 31\u0026deg;33'46.49\"N, 30\u0026deg;57'23.36\"E \u0026rarr; To 31\u0026deg;32'26.43\"N, 30\u0026deg;57'24.83\"E\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c5\"\u003e\u003cp\u003eLow-lying, rapidly subsiding, exposed without protection\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e\u003cp\u003e0.0\u0026ndash;1.0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c7\"\u003e\u003cp\u003e0.0\u0026ndash;1.0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c8\"\u003e\u003cp\u003eBeaches, narrow Burullus Lake barrier, international road, proposals for farms \u0026amp; urban expansion\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c9\"\u003e\u003cp\u003e27\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c10\"\u003e\u003cp\u003e216\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e2\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003ePort Said (Area 2)\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eWest Ashom Elgazni Boghaz\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c4\"\u003e\u003cp\u003eFrom 31\u0026deg;9'54.52\"N, 32\u0026deg;15'25.35\"E \u0026rarr; To 31\u0026deg;9'28.29\"N, 32\u0026deg;15'27.89\"E\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c5\"\u003e\u003cp\u003eLow-lying, highly eroded, exposed without protection\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e\u003cp\u003e3.0\u0026ndash;5.0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c7\"\u003e\u003cp\u003e0.8\u0026ndash;2.0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c8\"\u003e\u003cp\u003eResort beaches near Manzala Lake barrier, international road protection\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c9\"\u003e\u003cp\u003e12\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c10\"\u003e\u003cp\u003e96\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e3\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003eBeheira (Area 3)\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eWest Rosetta estuary, downstream of the 9 groins\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c4\"\u003e\u003cp\u003eFrom 31\u0026deg;29'40.63\"N, 30\u0026deg;7'47.79\"E \u0026rarr; To 31\u0026deg;29'15.31\"N, 30\u0026deg;7'47.17\"E\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c5\"\u003e\u003cp\u003eLow-lying, highly eroded, shifting sand due to groin construction\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e\u003cp\u003e0.0\u0026ndash;3.0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c7\"\u003e\u003cp\u003e0.0\u0026ndash;1.0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c8\"\u003e\u003cp\u003eBeaches and cultivated fields\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c9\"\u003e\u003cp\u003e3\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c10\"\u003e\u003cp\u003e48\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e4\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003eDamietta (Area 4)\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eEast of new Damietta city\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c4\"\u003e\u003cp\u003eFrom 31\u0026deg;29'47.04\"N, 31\u0026deg;52'37.35\"E \u0026rarr; To 31\u0026deg;28'54.36\"N, 31\u0026deg;52'39.53\"E\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c5\"\u003e\u003cp\u003eLow-lying, subsiding, moderately exposed with limited protection\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e\u003cp\u003e1.0\u0026ndash;2.0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c7\"\u003e\u003cp\u003e1.0\u0026ndash;2.0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c8\"\u003e\u003cp\u003eResort beaches and cultivated areas\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c9\"\u003e\u003cp\u003e12\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c10\"\u003e\u003cp\u003e96\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e5\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003eDakahlia (Area 5)\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eWest of new Gamasa city\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c4\"\u003e\u003cp\u003eFrom 31\u0026deg;29'12.16\"N, 31\u0026deg;28'10.19\"E \u0026rarr; To 31\u0026deg;28'49.51\"N, 31\u0026deg;28'9.35\"E\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c5\"\u003e\u003cp\u003eLow-lying, exposed without protection\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e\u003cp\u003e0.5\u0026ndash;1.0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c7\"\u003e\u003cp\u003e1.0\u0026ndash;2.0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c8\"\u003e\u003cp\u003eResort beaches, cultivated lands, international road\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c9\"\u003e\u003cp\u003e15\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c10\"\u003e\u003cp\u003e96\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/tbody\u003e\u003c/colgroup\u003e\u003c/table\u003e\u003c/div\u003e\u003c/p\u003e\u003cp\u003eThis study method (Fig.\u0026nbsp;\u003cspan refid=\"Fig1\" class=\"InternalRef\"\u003e1\u003c/span\u003e) focuses on the coastal governorates of the Nile Delta (Fig.\u0026nbsp;\u003cspan refid=\"Fig2\" class=\"InternalRef\"\u003e2\u003c/span\u003e), which are recognized as national and global hotspots of climate vulnerability (UNDP, 2017; IHCantabria, 2017). The analysis is centered on three priority zones identified for their acute exposure to compound climate risks: the coastal stretches of Damietta, Port Said, and the Rosetta/Burullus region (Table\u0026nbsp;\u003cspan refid=\"Tab1\" class=\"InternalRef\"\u003e1\u003c/span\u003e). These areas are characterized by low-lying topography, with vast tracts of land situated below 3 m elevation, making them highly susceptible to inundation from SLR and storm surges (UNDP, 2017). They host a dense concentration of population, critical infrastructure (including the Burullus and Jamasa power plants and the international coastal road), and vital economic assets spanning agriculture, fisheries, industry, and tourism (UNDP, 2017; IHCantabria, 2017). The selection of these sites allows for a differentiated analysis representative of the diverse challenges across the delta: the Rosetta/Burullus area is defined by extreme coastal erosion following sediment reduction from the Aswan High Dam; Damietta presents a complex mosaic of urban, industrial, and agricultural land uses under threat; and Port Said, a major urban and economic hub at the entrance of the Suez Canal, faces one of the highest rates of relative SLR due to severe land subsidence.\u003c/p\u003e\u003c/div\u003e\u003cdiv id=\"Sec4\" class=\"Section2\"\u003e\u003ch2\u003e2.2. An Integrated Framework for Financing NbS-Based Urban Resilience\u003c/h2\u003e\u003cp\u003eThe core of this paper's methodology is a novel, four-stage analytical framework designed to systematically translate climate risks into a pipeline of bankable NbS projects. This framework provides a structured pathway for policymakers and project developers, moving logically from problem identification to financial mobilization. Each stage involves specific methods, data inputs, and measurable outputs that collectively build the investment case for NbS. The structure of the framework is detailed in Table\u0026nbsp;\u003cspan refid=\"Tab2\" class=\"InternalRef\"\u003e2\u003c/span\u003e.\u003c/p\u003e\u003cp\u003e\u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"Yes\" id=\"Tab2\" border=\"1\"\u003e\u003ccaption language=\"En\"\u003e\u003cdiv class=\"CaptionNumber\"\u003eTable 2\u003c/div\u003e\u003cdiv class=\"CaptionContent\"\u003e\u003cp\u003eAn Integrated Framework for Financing Nature-Based Solutions in the Nile Delta\u003c/p\u003e\u003c/div\u003e\u003c/caption\u003e\u003ccolgroup cols=\"5\"\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c1\" colnum=\"1\"\u003e\u003c/div\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c2\" colnum=\"2\"\u003e\u003c/div\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c3\" colnum=\"3\"\u003e\u003c/div\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c4\" colnum=\"4\"\u003e\u003c/div\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c5\" colnum=\"5\"\u003e\u003c/div\u003e\u003cthead\u003e\u003ctr\u003e\u003cth align=\"left\" colname=\"c1\"\u003e\u003cp\u003eStage\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c2\"\u003e\u003cp\u003eObjective\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c3\"\u003e\u003cp\u003eMethods\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c4\"\u003e\u003cp\u003eKey Data Inputs\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c5\"\u003e\u003cp\u003eOutputs\u003c/p\u003e\u003c/th\u003e\u003c/tr\u003e\u003c/thead\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e\u003cb\u003eStage 1: Climate Risk \u0026amp; Vulnerability Assessment\u003c/b\u003e\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003eTo quantify and map compound risks to urban systems.\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eGIS-based spatial analysis; Flood modeling (using data from GOW, GOS, GOT databases); Economic valuation of assets at risk.\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c4\"\u003e\u003cp\u003eDigital Elevation Models (DEMs), land use maps, SLR scenarios (RCP8.5), subsidence rates, socioeconomic data (UNDP, 2017; CoRI, 2012).\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c5\"\u003e\u003cp\u003eVulnerability and risk maps; quantitative estimates of potential economic losses (\"cost of inaction\").\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e\u003cb\u003eStage 2: NbS Prioritization \u0026amp; Design\u003c/b\u003e\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003eTo identify and design the most effective and context-appropriate NbS for specific hotspots.\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eMulti-Criteria Assessment (MCA) considering: technical feasibility, cost-effectiveness, resilience benefits, co-benefits (biodiversity, social).\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c4\"\u003e\u003cp\u003eCatalogue of NbS interventions (soft dikes, dune restoration, wetland creation); construction specifications; local ecological conditions (UNDP, 2017; Kumar et al., 2020; IHCantabria, 2017).\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c5\"\u003e\u003cp\u003eA prioritized portfolio of context-specific NbS projects with conceptual designs and technical specifications.\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e\u003cb\u003eStage 3: Resilience Impact \u0026amp; Co-Benefit Quantification\u003c/b\u003e\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003eTo measure the contribution of NbS to urban resilience and monetize their full spectrum of benefits.\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eCost-Benefit Analysis (CBA); Ecosystem service valuation; Resilience metrics (e.g., number of people protected, value of assets safeguarded, reduction in expected annual damages).\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c4\"\u003e\u003cp\u003eEconomic damage data (UNDP, 2017), ecological data (UNDP, 2017), global benefit valuation databases (World Bank, 2023; Ranger \u0026amp; van Raalte, 2023).\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c5\"\u003e\u003cp\u003eInvestment-grade business cases for each prioritized NbS project, including Return on Investment (ROI) and monetized co-benefits.\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e\u003cb\u003eStage 4: Climate Finance Mapping \u0026amp; Structuring\u003c/b\u003e\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003eTo align bankable NbS projects with suitable national and international financial instruments.\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eFinancial instrument analysis; Blended finance structuring; Policy and institutional review.\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c4\"\u003e\u003cp\u003eGCF investment criteria, World Bank programs, private investor requirements, national budgetary processes (Climate Policy Initiative, 2024; World Bank, 2025; World Bank, 2023).\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c5\"\u003e\u003cp\u003eA diversified financing strategy and investment plan for a portfolio of NbS projects.\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/tbody\u003e\u003c/colgroup\u003e\u003c/table\u003e\u003c/div\u003e\u003c/p\u003e\u003c/div\u003e\u003cdiv id=\"Sec5\" class=\"Section2\"\u003e\u003ch2\u003e2.3. Data Extraction and Analytical Methods\u003c/h2\u003e\u003cp\u003eThe research is based on a comprehensive synthesis of data from technical assessments and supplemented with recent peer-reviewed literature. Primary data were drawn from feasibility studies conducted for the Green Climate Fund (GCF) and their annexes, which include detailed flood level assessments, specifications for soft engineering solutions, and economic valuations of flood impacts (UNDP, 2017; IHCantabria, 2017). This is complemented by Integrated Coastal Zone Management (ICZM) scoping studies, which provide extensive information on coastal processes, ecological assessments, and institutional frameworks (IHCantabria, 2017; IHCantabria, 2016). To fill conceptual gaps and ensure the framework aligns with current best practices, secondary data were sourced from scholarly articles (2018\u0026ndash;2025) focusing on climate finance, NbS effectiveness, and urban resilience theory (Cohen-Shacham et al., 2016; Shirley et al., 2025; WWF, 2022; World Bank, 2023; World Bank, 2023).\u003c/p\u003e\u003cp\u003eThe analytical methods applied correspond to the stages of the integrated framework:\u003c/p\u003e\u003cp\u003e\u003cul\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eGIS Spatial Analysis and Vulnerability Modeling (Stage 1)\u003c/b\u003e: The methodology outlined in GCF feasibility studies was replicated and extended to create high-resolution risk maps (UNDP, 2017). This involved layering geospatial data on compound hazards\u0026mdash;including projected SLR under RCP8.5, local subsidence rates, and storm surge inundation levels from the Global Ocean Surges (GOS) database\u0026mdash;onto maps of socioeconomic exposure. Exposure data included population density, land use (urban, agriculture, industrial), and the location of critical infrastructure. This process allowed for the precise identification of high-risk urban areas and the quantification of assets and populations within these zones.\u003c/p\u003e\u003c/li\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eMulti-Criteria Assessment (MCA) (Stage 2)\u003c/b\u003e: To prioritize NbS interventions, a systematic MCA was developed. A catalogue of potential NbS interventions was compiled from technical documentation, including soft dikes, dune restoration, beach nourishment, and managed realignment (UNDP, 2017). Each potential solution was scored against a set of weighted criteria: (1) \u003cb\u003eFlood Risk Reduction Effectiveness\u003c/b\u003e: ability to attenuate wave energy and reduce inundation depth; (2) \u003cb\u003eErosion Control\u003c/b\u003e: capacity to stabilize shorelines and trap sediment; (3) \u003cb\u003eCost-Effectiveness\u003c/b\u003e: estimated lifecycle cost compared to traditional gray infrastructure; (4) \u003cb\u003eImplementation Feasibility\u003c/b\u003e: technical complexity and timeline; and (5) \u003cb\u003eCo-Benefits\u003c/b\u003e: positive impacts on biodiversity, local livelihoods (e.g., fisheries, tourism), and carbon sequestration.\u003c/p\u003e\u003c/li\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eEconomic Valuation (Stage 3)\u003c/b\u003e: The financial viability of prioritized NbS was assessed using a comprehensive Cost-Benefit Analysis (CBA). The \"costs\" included capital expenditure for implementation and ongoing operation and maintenance. The \"benefits\" were quantified in two categories. First, the direct resilience benefits were calculated as the \"avoided costs\" of climate impacts, using the damage cost methodology and asset valuation data from the economic impact assessment (UNDP, 2017). This represents the value of property, infrastructure, and agricultural land protected from flooding and erosion. Second, the economic value of ecosystem service co-benefits was estimated using benefit-transfer methods, drawing on established values from global studies for services such as carbon sequestration in restored wetlands, enhanced fish nursery habitats, and increased tourism revenue from improved coastal aesthetics (World Bank, 2023; Ranger \u0026amp; van Raalte, 2023).\u003c/p\u003e\u003c/li\u003e\u003c/ul\u003e\u003c/p\u003e\u003c/div\u003e\u003cdiv id=\"Sec6\" class=\"Section2\"\u003e\u003ch2\u003e2.4. Validation\u003c/h2\u003e\u003cp\u003eThe methodological framework and its outputs were validated to ensure their robustness and policy relevance. The identified risks and proposed NbS interventions were cross-referenced with the priorities outlined in Egypt's National Strategy for Adaptation to Climate Change and Disaster Risk Reduction (NSACC) and its Third National Communication (TNC) to the UNFCCC, confirming alignment with national policy objectives (UNDP, 2017; IHCantabria, 2017; EEAA, 2016). Furthermore, the proposed financial structuring strategies were benchmarked against the investment criteria and best practice guidelines of key international financial institutions, including the Green Climate Fund and the World Bank, to ensure the \"bankability\" of the resulting project concepts (ACCNDP, 2016; World Bank, 2025; World Bank, 2023). This dual validation process ensures that the framework is both scientifically sound and practically applicable within the current policy and financial landscape.\u003c/p\u003e\u003c/div\u003e"},{"header":"3. Results","content":"\u003cdiv id=\"Sec8\" class=\"Section2\"\u003e\n \u003ch2\u003e3.1. Spatial Analysis of Compound Climate Risks in Nile Delta Hotspots\u003c/h2\u003e\n \u003cp\u003e\u003c/p\u003e\n \u003ctable id=\"Tab3\" border=\"1\"\u003e\n \u003ccaption language=\"En\"\u003e\n \u003cdiv class=\"CaptionNumber\"\u003eTable 3\u003c/div\u003e\n \u003cdiv class=\"CaptionContent\"\u003e\n \u003cp\u003eProjected Inundated Area in Vulnerable Coastal Units\u003c/p\u003e\n \u003c/div\u003e\n \u003c/caption\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eStudy area\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eCoastal Unit\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eProjected Inundated Area (km\u0026sup2;) 2050\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eProjected Inundated Area (km\u0026sup2;) 2100\u003c/p\u003e\n \u003c/th\u003e\n \u003c/tr\u003e\n \u003c/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eKafr El-Sheikh (West Burullus inlet)\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eCU3-SUB2\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"char\"\u003e\n \u003cp\u003e118.2\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e521.9\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003ePort Said (West new Ashtom Elgamil)\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eCU5-SUB1\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"char\"\u003e\n \u003cp\u003e14.7\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e355\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eBeheira (West Rosetta estuary)\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eCU3-SUB1\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"char\"\u003e\n \u003cp\u003e5.06\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e571.8\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eDamietta (East of new Damietta city)\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eCU4-SUB2\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"char\"\u003e\n \u003cp\u003e0.013\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e21.7\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eDakahlia (West of new Gamasa city)\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eCU4-SUB1\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"char\"\u003e\n \u003cp\u003e1.70\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e30.4\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003c/tbody\u003e\n \u003c/table\u003e\n \u003cp\u003e\u003c/p\u003e\n \u003cp\u003eThe application of the Stage 1 framework reveals the acute and spatially concentrated nature of climate risk across the Nile Delta\u0026apos;s coastal hotspots (Table \u003cspan class=\"InternalRef\"\u003e3\u003c/span\u003e), and (Fig. 3). The GIS-based analysis, integrating global SLR projections with local subsidence data, confirms that the region faces a significantly accelerated rate of relative sea-level rise. Under the RCP8.5 scenario, a global SLR of \u003cspan\u003e$\u003c/span\u003e0.84\u003cspan\u003e$\u003c/span\u003e m by 2100 translates into a localized relative SLR exceeding \u003cspan\u003e$\u003c/span\u003e1.2\u003cspan\u003e$\u003c/span\u003e m in Port Said and approaching \u003cspan\u003e$\u003c/span\u003e1.0\u003cspan\u003e$\u003c/span\u003e m in the Burullus region. This amplified threat places vast areas of densely populated and economically vital land at risk of permanent inundation and increased flood frequency.\u003c/p\u003e\n \u003cp\u003eCoastal erosion, driven by the sediment deficit from the Aswan High Dam and exacerbated by rising sea levels, poses a concurrent threat, with the highest rates observed near the Rosetta and Damietta promontories. In unprotected segments, shoreline retreat has been documented at rates exceeding 30 m/year, directly threatening coastal infrastructure and communities (IHCantabria, 2017). The economic implications of inaction are substantial. Applying established valuation methodologies, the projected damage to non-financial assets (including residential, commercial, and industrial infrastructure) from flooding and erosion runs into billions of Egyptian pounds for each key coastal unit. Table \u003cspan class=\"InternalRef\"\u003e4\u003c/span\u003e synthesizes the risk profiles for the three primary hotspots, quantifying the scale of the threat to population, key economic assets, and the estimated financial cost of inaction by 2100.\u003c/p\u003e\n \u003cp\u003e\u003c/p\u003e\n \u003ctable id=\"Tab4\" border=\"1\"\u003e\n \u003ccaption language=\"En\"\u003e\n \u003cdiv class=\"CaptionNumber\"\u003eTable 4\u003c/div\u003e\n \u003cdiv class=\"CaptionContent\"\u003e\n \u003cp\u003eClimate Risk Profile of Nile Delta Hotspots (Projected to 2100, RCP8.5)\u003c/p\u003e\n \u003c/div\u003e\n \u003c/caption\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eHotspot (Governorate)\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eKey Vulnerabilities\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eProjected Relative SLR (m)\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eMax. Erosion Rate (m/yr)\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003ePopulation at Risk\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eKey Economic Assets at Risk\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eEstimated Cost of Inaction (L.E. billion)\u003c/p\u003e\n \u003c/th\u003e\n \u003c/tr\u003e\n \u003c/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eRosetta/Burullus (Kafr El Sheikh)\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eAgriculture, Fisheries, Critical Infrastructure\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"char\"\u003e\n \u003cp\u003e~\u003cspan\u003e$\u003c/span\u003e1.0\u003cspan\u003e$\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e\u0026gt;\u0026thinsp;30\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e~\u0026thinsp;750,000\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eBurullus Power Plant, fertile agricultural lands, fishing ports, international coastal road\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e\u0026gt;\u0026thinsp;150\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eDamietta\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eUrban Centers, Industry, Agriculture, Port\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"char\"\u003e\n \u003cp\u003e~\u003cspan\u003e$\u003c/span\u003e1.1\u003cspan\u003e$\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e15\u0026ndash;25\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e~\u0026thinsp;500,000\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eDamietta Port, furniture industry clusters, urban areas, agricultural lands\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e\u0026gt;\u0026thinsp;120\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003ePort Said\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eMajor Urban Center, Port, Industry, Suez Canal\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"char\"\u003e\n \u003cp\u003e\u0026gt;\u003cspan\u003e$\u003c/span\u003e1.2\u003cspan\u003e$\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e5\u0026ndash;15\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e\u0026gt;\u0026thinsp;1,000,000\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003ePort Said city, Suez Canal access channels, industrial zones, tourism infrastructure\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003e\u0026gt;\u0026thinsp;200\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003c/tbody\u003e\n \u003c/table\u003e\n \u003cp\u003e\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv id=\"Sec9\" class=\"Section2\"\u003e\n \u003ch2\u003e3.2. Prioritization and Design of Nature-Based Solutions\u003c/h2\u003e\n \u003cp\u003eThe Multi-Criteria Assessment (MCA) conducted in Stage 2 of the framework yielded a portfolio of prioritized, context-specific NbS interventions tailored to the unique risk profiles and socio-ecological characteristics of each hotspot. The results, summarized in Table \u003cspan class=\"InternalRef\"\u003e3\u003c/span\u003e, demonstrate a clear rationale for selecting different types of solutions for different areas.\u003c/p\u003e\n \u003cp\u003eFor the \u003cstrong\u003eBurullus region\u003c/strong\u003e, characterized by high wave energy and the presence of critical infrastructure like the Burullus power plant, the MCA ranked \u003cstrong\u003esoft dikes with geotextile cores\u003c/strong\u003e as the highest-priority intervention. This solution offers a high degree of flood protection and moderate erosion control at a reasonable cost. The design is based on successful pilot projects implemented under the ACCNDP, which have proven the technical feasibility of using sand-filled geotextile containers covered with a clay layer and rip-rap revetment to create resilient, yet flexible, coastal defenses (UNDP, 2017).\u003c/p\u003e\n \u003cp\u003eIn contrast, for the tourism-dependent coastal stretches near \u003cstrong\u003eDamietta\u003c/strong\u003e and the planned tourism developments in the \u003cstrong\u003eNorth Sinai (El Arish)\u003c/strong\u003e, the MCA prioritized \u003cstrong\u003edune restoration and stabilization\u003c/strong\u003e. This approach scored highly on cost-effectiveness and co-benefits, as it not only provides moderate flood protection and excellent erosion control by trapping wind-blown sand but also restores the natural landscape, enhancing the aesthetic and recreational value crucial for the tourism sector. The proposed design involves using sand-trapping fences and planting native vegetation to rebuild and stabilize the dune systems, a technique also tested and recommended in previous ICZM scoping analyses (UNDP, 2017; IHCantabria, 2017).\u003c/p\u003e\n \u003cp\u003eFor low-lying agricultural lands situated behind the primary coastline, particularly in the hinterlands of the \u003cstrong\u003eRosetta\u003c/strong\u003e and \u003cstrong\u003eManzala\u003c/strong\u003e lagoons, \u003cstrong\u003ewetland restoration and managed realignment\u003c/strong\u003e were identified as highly effective long-term solutions. These interventions create natural buffer zones that can absorb and retain large volumes of floodwater, reduce nutrient runoff from agricultural fields, and restore critical habitats for fisheries and biodiversity (Table \u003cspan class=\"InternalRef\"\u003e5\u003c/span\u003e), and (Fig.\u0026nbsp;4). While politically complex to implement due to land-use trade-offs, they offer very high co-benefits and long-term resilience at a high level of cost-effectiveness (UNDP, 2017).\u003c/p\u003e\n \u003cp\u003e\u003c/p\u003e\n \u003ctable id=\"Tab5\" border=\"1\"\u003e\n \u003ccaption language=\"En\"\u003e\n \u003cdiv class=\"CaptionNumber\"\u003eTable 5\u003c/div\u003e\n \u003cdiv class=\"CaptionContent\"\u003e\n \u003cp\u003eMulti-Criteria Assessment of Prioritized NbS Interventions\u003c/p\u003e\n \u003c/div\u003e\n \u003c/caption\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eNbS Intervention\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eHotspot Application\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eFlood Risk Reduction\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eErosion Control\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eCost-Effectiveness\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eCo-Benefits (Biodiversity, Social)\u003c/p\u003e\n \u003c/th\u003e\n \u003cth align=\"left\"\u003e\n \u003cp\u003eOverall Priority Score\u003c/p\u003e\n \u003c/th\u003e\n \u003c/tr\u003e\n \u003c/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eSoft Dikes (Geotextile Core)\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eBurullus, Damietta (Industrial)\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eHigh\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eModerate\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eModerate\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eLow\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eHigh\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eDune Restoration \u0026amp; Stabilization\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eDamietta, Port Said (Tourism)\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eModerate\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eHigh\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eHigh\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eHigh\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eHigh\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eWetland Restoration\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eRosetta, Manzala (Hinterland)\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eHigh\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eLow\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eHigh\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eVery High\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eModerate (Long-term)\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eManaged Realignment\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eLow-value agricultural land\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eVery High\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eN/A\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eHigh\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eVery High\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd align=\"left\"\u003e\n \u003cp\u003eLow (Politically Complex)\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003c/tbody\u003e\n \u003c/table\u003e\n \u003cp\u003e\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv id=\"Sec10\" class=\"Section2\"\u003e\n \u003ch2\u003e3.3. Financial Viability and Co-Benefit Analysis\u003c/h2\u003e\n \u003cp\u003eThe Cost-Benefit Analysis (CBA) from Stage 3 of the framework demonstrates a compelling financial case for investing in the prioritized NbS portfolio. When the full spectrum of benefits is quantified, the economic returns of NbS interventions significantly outweigh their implementation and maintenance costs.\u003c/p\u003e\n \u003cp\u003eThe direct resilience benefits, calculated as the avoided damages to assets and economic activity, are substantial. For instance, the \u0026quot;Enhancing Climate Change Adaptation in the North Coast of Egypt\u0026quot; project, with a budget of approximately \u003cspan\u003e$\u003c/span\u003e105\u0026nbsp;million for constructing 70 km of nature-based dikes and other measures, is designed to protect assets and economic activities valued in the billions of Egyptian pounds (GCF, 2017; UNDP, 2017). Global analyses confirm that NbS can be up to 50% more cost-effective than purely gray infrastructure alternatives over their lifecycle, particularly when maintenance costs are considered (UNEP FI, 2023).\u003c/p\u003e\n \u003cp\u003eThe inclusion of monetized co-benefits further strengthens the investment case. For example, the restoration of coastal wetlands near Lake Manzala not only provides flood storage but also enhances fish nursery habitats, which supports the local fishing industry\u0026mdash;a significant contributor to the regional economy. Similarly, dune restoration projects enhance the aesthetic appeal of coastal areas, directly contributing to the sustainability and growth of the tourism sector. Studies have shown that investments in urban NbS, such as green spaces and wetlands, can generate returns on investment of three-to-one or higher when health, recreational, and biodiversity benefits are accounted for (Ranger \u0026amp; van Raalte, 2023). By quantifying these co-benefits\u0026mdash;such as carbon sequestration, improved water quality, and enhanced biodiversity\u0026mdash;the CBA reveals that NbS projects are not merely cost centers for protection but are productive investments that generate multiple, cross-sectoral revenue streams and societal value, making them highly attractive for blended finance models that can capture value for different stakeholders (World Bank, 2023; Saleh, 2018).\u003c/p\u003e\n\u003c/div\u003e"},{"header":"4. Discussion","content":"\u003cdiv id=\"Sec12\" class=\"Section2\"\u003e\u003ch2\u003e4.1. An Integrated Framework to Unlock Climate Finance\u003c/h2\u003e\u003cp\u003eThe primary contribution of this research is the development of an integrated framework that systematically addresses the \"bankability\" problem hindering the large-scale implementation of NbS in Egypt. The framework creates a clear, evidence-based narrative that connects financial investment to measurable resilience outcomes, a critical step for unlocking climate finance. By translating physical risks like erosion and flooding into financial risks\u0026mdash;such as asset loss, business interruption, and impacts on GDP\u0026mdash;it frames the adaptation challenge in a language that resonates with finance ministries and private investors (WWF, 2022). Stage 3 of the framework, which quantifies both the avoided damages and the monetized co-benefits, demonstrates that NbS projects can offer a positive return on investment, directly countering the perception that they are high-risk, low-return ventures. This structured approach provides the analytical rigor needed to develop robust project proposals capable of meeting the stringent criteria of international financial institutions like the GCF and attracting private capital through blended finance instruments, guarantees, and green bonds (Climate Policy Initiative, 2024; Saleh, 2018).\u003c/p\u003e\u003c/div\u003e\u003cdiv id=\"Sec13\" class=\"Section2\"\u003e\u003ch2\u003e4.2. Overcoming Institutional Barriers to Implementation in Egypt\u003c/h2\u003e\u003cp\u003eBeyond its financial utility, the framework serves as a practical tool for overcoming the deep-seated institutional barriers that have stymied effective coastal management in Egypt. The country's coastal governance has long been characterized by fragmentation, with different ministries and authorities operating in silos, leading to uncoordinated and often contradictory actions (UNDP, 2017; IHCantabria, 2017). The framework's integrated, data-driven process acts as a forcing mechanism for collaboration. For example, the GIS modeling in Stage 1 requires data sharing between the Ministry of Water Resources and Irrigation (hydrological data), the Ministry of Environment (ecological data), and local governorates (land use and planning data) (Fig.\u0026nbsp;\u003cspan refid=\"Fig3\" class=\"InternalRef\"\u003e5\u003c/span\u003e). Similarly, the multi-criteria assessment in Stage 2 necessitates a joint prioritization process, compelling different agencies to negotiate trade-offs and align their objectives within a common analytical structure.\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003eThis process directly addresses the barriers identified in national assessments and scoping studies, as detailed in Table\u0026nbsp;\u003cspan refid=\"Tab6\" class=\"InternalRef\"\u003e6\u003c/span\u003e. By providing a common, evidence-based language and a shared set of priorities, the framework can help operationalize Egypt's national ICZM strategy and empower coordinating bodies like the National Committee for ICZM (NCICZM), which have historically struggled to enforce inter-agency cooperation (IHCantabria, 2017; EEAA, 2016). It transforms the abstract goal of \"integration\" into a concrete, step-by-step workflow.\u003c/p\u003e\u003cp\u003e\u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"Yes\" id=\"Tab6\" border=\"1\"\u003e\u003ccaption language=\"En\"\u003e\u003cdiv class=\"CaptionNumber\"\u003eTable 6\u003c/div\u003e\u003cdiv class=\"CaptionContent\"\u003e\u003cp\u003e Policy and Financial Barriers to NbS Implementation in Egypt and Framework-Based Solutions\u003c/p\u003e\u003c/div\u003e\u003c/caption\u003e\u003ccolgroup cols=\"3\"\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c1\" colnum=\"1\"\u003e\u003c/div\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c2\" colnum=\"2\"\u003e\u003c/div\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c3\" colnum=\"3\"\u003e\u003c/div\u003e\u003cthead\u003e\u003ctr\u003e\u003cth align=\"left\" colname=\"c1\"\u003e\u003cp\u003eBarrier\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c2\"\u003e\u003cp\u003eSource\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c3\"\u003e\u003cp\u003eSolution Provided by Integrated Framework\u003c/p\u003e\u003c/th\u003e\u003c/tr\u003e\u003c/thead\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e\u003cb\u003eInstitutional Fragmentation / Lack of Coordination\u003c/b\u003e\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003e(UNDP, 2017; IHCantabria, 2017)\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eStage 1 \u0026amp; 2 require cross-ministerial data sharing and joint prioritization, fostering collaboration around a common analytical platform.\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e\u003cb\u003eLack of Bankable Projects / Weak Financial Case\u003c/b\u003e\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003e(WWF, 2022)\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eStage 3 \u0026amp; 4 are explicitly designed to produce investment-grade business cases and map them to suitable financial instruments.\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e\u003cb\u003eWeak Evidence Base on NbS Effectiveness \u0026amp; Benefits\u003c/b\u003e\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003e(Seddon et al., 2020)\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eStage 3 quantifies both direct resilience benefits (avoided damages) and monetized co-benefits, providing a robust evidence base for decision-making.\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003e\u003cb\u003eDominance of \"Gray\" Path Dependency\u003c/b\u003e\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c2\"\u003e\u003cp\u003e(UNDP, 2017; Seddon et al., 2020)\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"left\" colname=\"c3\"\u003e\u003cp\u003eThe Cost-Benefit Analysis in Stage 3 demonstrates the superior lifecycle cost-effectiveness of NbS and hybrid solutions, creating a strong financial incentive to shift away from purely gray options.\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/tbody\u003e\u003c/colgroup\u003e\u003c/table\u003e\u003c/div\u003e\u003c/p\u003e\u003c/div\u003e\u003cdiv id=\"Sec14\" class=\"Section2\"\u003e\u003ch2\u003e4.3. From Project-Based Interventions to Systemic Coastal Resilience\u003c/h2\u003e\u003cp\u003eA key implication of this framework is its potential to shift Egypt's coastal adaptation strategy from a reactive, project-by-project approach to a proactive, systemic model of resilience-building. The current paradigm, often driven by disaster response, has led to a patchwork of isolated hard engineering projects that fail to address the underlying drivers of vulnerability and can lead to maladaptation. The framework, by contrast, promotes a holistic and long-term perspective consistent with the principles of ICZM (IHCantabria, 2017). It encourages planners to consider the entire coastal system, including the interplay between natural processes and human activities. Furthermore, it explicitly allows for the design and evaluation of hybrid \"green-gray\" infrastructure, where NbS are integrated with existing or new engineered structures to create more resilient and cost-effective systems (Pathak et al., 2024; Shirley et al., 2025). For example, restoring a beach and dune system in front of an existing seawall can dissipate wave energy, reducing stress on the hard structure, extending its lifespan, and lowering maintenance costs, while also restoring ecological and recreational value. By mainstreaming this integrated approach into national and municipal planning cycles, the framework can help break the cycle of maladaptation and foster a more sustainable and resilient coastal governance model.\u003c/p\u003e\u003c/div\u003e\u003cdiv id=\"Sec15\" class=\"Section2\"\u003e\u003ch2\u003e4.4. Global Implications for Vulnerable Delta Cities\u003c/h2\u003e\u003cp\u003eThe challenges confronting the Nile Delta\u0026mdash;compounding risks from SLR and subsidence, rapid urbanization, and institutional barriers to adaptation\u0026mdash;are not unique. They are emblematic of the crises facing other major deltaic systems across the developing world, such as the Mekong Delta in Vietnam and the Ganges-Brahmaputra Delta in Bangladesh (Agrawala et al., 2004; Baker, 2012). These regions share similar vulnerabilities and face comparable difficulties in accessing the climate finance needed to implement large-scale adaptation. The modular and scalable design of the proposed framework makes it highly replicable. Its four-stage process can be adapted to different socio-ecological contexts and data availability levels. As such, it offers a transferable model for other developing countries seeking to build a robust, evidence-based pipeline of bankable NbS projects. By demonstrating a clear pathway to translate adaptation needs into fundable actions, this research contributes to the global discourse on operationalizing climate finance and scaling up NbS to protect the world's most vulnerable coastal communities (World Bank, 2025; World Bank, 2023).\u003c/p\u003e\u003c/div\u003e"},{"header":"5. Conclusion","content":"\u003cp\u003eThe Nile Delta's urban coastal zones are at a critical juncture, facing existential threats from a confluence of climate-driven and anthropogenic pressures. This paper argued that the prevailing adaptation response, characterized by a reliance on localized hard engineering, is insufficient and often maladaptive. A paradigm shift towards the large-scale implementation of Nature-Based Solutions is essential for building long-term, systemic resilience. However, this shift is currently stalled by a critical disconnect between high-level policy ambitions, the availability of international climate finance, and the on-the-ground capacity to develop bankable projects. The integrated analytical framework developed and applied in this research provides a viable pathway to break this deadlock. By systematically linking climate risk assessment, NbS prioritization, economic valuation, and financial structuring, the framework creates a clear, evidence-based methodology for translating adaptation needs into investment-grade opportunities. The findings demonstrate that not only are NbS technically feasible for the Nile Delta's specific challenges, but they are also financially viable, often presenting a more cost-effective solution than traditional infrastructure when their full range of co-benefits is considered.\u003c/p\u003e\u003cp\u003eThe core logic for scaling climate finance for NbS in the Nile Delta, as illuminated by the framework, is to build a compelling and de-risked investment case. This involves several strategic pathways:\u003c/p\u003e\u003cp\u003e\u003col\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eFrom Hazard to Financial Risk\u003c/b\u003e: The first step is to reframe the climate challenge in financial terms. Robust, data-driven vulnerability assessments that quantify the economic value of assets at risk and the potential GDP impacts of inaction are essential for gaining the attention of finance ministries and private investors.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eBuilding the Business Case for Nature\u003c/b\u003e: Comprehensive Cost-Benefit Analyses that monetize the full spectrum of NbS benefits\u0026mdash;including direct protection (avoided damages) and indirect co-benefits (ecosystem services)\u0026mdash;are crucial. This demonstrates that NbS are not simply environmental expenditures but are productive investments that generate tangible economic returns across multiple sectors.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eDeveloping a Portfolio Approach\u003c/b\u003e: Rather than seeking funding for isolated projects, the framework enables the development of a diversified portfolio of NbS interventions. This approach allows for the bundling of projects to achieve the scale necessary to attract institutional investors and allows for the blending of different financial instruments (e.g., concessional loans for infrastructure-like components, grants for capacity building, and private equity for revenue-generating co-benefits).\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eLeveraging Public Finance to Catalyze Private Investment\u003c/b\u003e: The framework helps identify where public funds, including international climate finance, can be used most catalytically. This includes funding for the initial stages of project development (risk assessment, feasibility studies) and using public capital to de-risk investments for the private sector through mechanisms like first-loss guarantees or concessional debt.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003c/ol\u003e\u003c/p\u003e\u003cp\u003eTo operationalize these pathways and accelerate the transition to resilient coastal management, the following policy actions are recommended:\u003c/p\u003e\u003cp\u003e\u003cul\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eFor the Government of Egypt (Ministry of Water Resources and Irrigation, Ministry of Environment)\u003c/b\u003e:\u003c/p\u003e\u003cp\u003e\u003col\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eAdopt the Integrated Framework\u003c/b\u003e: Formally adopt the four-stage framework as a standard methodology for all coastal adaptation planning and project development.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eMandate for ICZM\u003c/b\u003e: Mandate the use of this framework in the development and implementation of the National Integrated Coastal Zone Management (ICZM) plan to ensure it is evidence-based and financially sound.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eEstablish an NbS Project Pipeline Unit\u003c/b\u003e: Create a dedicated inter-ministerial task force, with technical and financial expertise, responsible for using the framework to build and manage a national pipeline of bankable NbS projects ready for domestic and international financing.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003c/ol\u003e\u003c/p\u003e\u003c/li\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eFor International Financial Institutions (Green Climate Fund, World Bank, African Development Bank)\u003c/b\u003e:\u003c/p\u003e\u003cp\u003e\u003col\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eFund Upstream Project Preparation\u003c/b\u003e: Prioritize funding for technical assistance facilities that support developing countries like Egypt in applying such integrated frameworks. This \"upstream\" investment in project preparation is critical for creating a pipeline of high-quality, fundable projects.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eDevelop Tailored Financial Instruments\u003c/b\u003e: Design and deploy financial instruments specifically tailored to the risk-return profile of large-scale NbS. This includes expanding the use of blended finance facilities, offering long-term concessional financing, and providing guarantees to mitigate perceived risks for private investors.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003c/ol\u003e\u003c/p\u003e\u003c/li\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eFor Municipal Authorities (e.g., Governorates of Alexandria, Port Said, Damietta)\u003c/b\u003e:\u003c/p\u003e\u003cp\u003e\u003col\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eIntegrate NbS into Urban Planning\u003c/b\u003e: Mainstream the outputs of the framework's risk assessments and NbS prioritization into local urban master plans, land-use regulations, and infrastructure investment strategies.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eBuild Local Capacity\u003c/b\u003e: Invest in building the technical capacity of municipal planning and engineering departments to design, implement, and maintain NbS and hybrid green-gray infrastructure projects.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003c/ol\u003e\u003c/p\u003e\u003c/li\u003e\u003c/ul\u003e\u003c/p\u003e\u003cp\u003eWhile this paper provides a strategic framework, further research is needed to refine its application and address remaining knowledge gaps. An agenda for future research should include:\u003c/p\u003e\u003cp\u003e\u003col\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eLong-Term Performance Monitoring\u003c/b\u003e: Establishing long-term monitoring programs for implemented NbS projects in the Nile Delta to gather empirical data on their performance, effectiveness, and maintenance costs under real-world environmental conditions.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eInnovative Financial Models\u003c/b\u003e: Investigating the feasibility of more advanced financial instruments for funding coastal resilience in Egypt, such as resilience bonds, debt-for-nature swaps, and dedicated natural capital funds.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eSocio-Political Dynamics\u003c/b\u003e: Conducting in-depth socio-political analysis of the challenges and opportunities associated with implementing large-scale adaptation projects, particularly those involving land-use changes like managed realignment, to develop effective governance and stakeholder engagement strategies.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003cspan\u003e\u003cli\u003e\u003cp\u003e\u003cb\u003eScaling and Replication\u003c/b\u003e: Applying the framework to other vulnerable coastal cities and deltaic regions to test its adaptability and refine its components, thereby contributing to a global knowledge base on financing nature-based urban resilience.\u003c/p\u003e\u003c/li\u003e\u003c/span\u003e\u003c/ol\u003e\u003c/p\u003e"},{"header":"Declarations","content":"\u003ch2\u003eEthical Approval:\u003c/h2\u003e\n\u003cp\u003eNot applicable. This study did not involve human participants or animal experiments.\u003c/p\u003e\n\u003ch2\u003eConsent to Participate:\u003c/h2\u003e\n\u003cp\u003eNot applicable.\u003c/p\u003e\n\u003ch2\u003eConsent to Publish:\u003c/h2\u003e\n\u003cp\u003eAll authors have read and approved the final version of the manuscript and consent to its publication in \u003cem\u003eDiscover Sustainability.\u003c/em\u003e\u003c/p\u003e\n\u003ch2\u003eClinical Trial Number\u003c/h2\u003e\n\u003cp\u003eNot applicable.\u003c/p\u003e\n\u003ch2\u003eCompeting Interests:\u003c/h2\u003e\n\u003cp\u003eThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.\u003c/p\u003e\n\u003ch2\u003eFunding:\u003c/h2\u003e\n\u003cp\u003eThis research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.\u003c/p\u003e\n\u003ch2\u003eAuthor Contribution\u003c/h2\u003e\n\u003cp\u003eT.O conceptualized the study, developed the analytical framework, and led the manuscript writing and revisions. T.O and A.N contributed to data collection, GIS-based analysis, and financial assessment. Both authors read and approved the final manuscript.\u003c/p\u003e\n\u003ch2\u003eData Availability\u003c/h2\u003e\n\u003cp\u003eThe datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.\u003c/p\u003e"},{"header":"References","content":"\u003col\u003e\n\u003cli\u003eAbdrabo, M.A. and Hassaan, M.A. (2015) \u0026apos;An integrated framework for assessing vulnerability of the Nile Delta coastal areas to inundation by sea level rise\u0026apos;, \u003cem\u003eEnvironment, Development and Sustainability\u003c/em\u003e, 17(4), pp. 849\u0026ndash;865.\u003c/li\u003e\n\u003cli\u003eAdaptation to Climate Change in the Nile Delta through Integrated Coastal Zone Management Project (ACCNDP) (2016) \u003cem\u003eThe Integrated Coastal Zone Management (ICZM) in Egypt \u0026ndash; a Scoping Study\u003c/em\u003e. IHCantabria.\u003c/li\u003e\n\u003cli\u003eAgrawala, S., Moehner, A., El Raey, M., Conway, D., van Aalst, M. and Hagenstad, M. (2004) \u003cem\u003eDevelopment and climate change in Egypt: Focus on coastal resources and the Nile\u003c/em\u003e. Paris: Organisation for Economic Co-operation and Development.\u003c/li\u003e\n\u003cli\u003eBaker, J.L. (ed.) (2012) \u003cem\u003eClimate change, disaster risk, and the urban poor: Cities building resilience for a changing world\u003c/em\u003e. Washington, D.C.: The World Bank.\u003c/li\u003e\n\u003cli\u003eBalzan, M.V., et al. (2022) \u0026apos;Overcoming barriers to the implementation of nature-based solutions in the Mediterranean\u0026apos;, \u003cem\u003eEnvironmental Science \u0026amp; Policy\u003c/em\u003e, 136, pp. 146-156.\u003c/li\u003e\n\u003cli\u003eCarnegie Endowment for International Peace (2023) \u003cem\u003eClimate change in Egypt: Opportunities and obstacles\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eClimate Policy Initiative (2024) \u003cem\u003eToolbox on financing nature-based solutions\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eCohen-Shacham, E., Walters, G., Janzen, C. and Maginnis, S. (eds.) (2016) \u003cem\u003eNature-based solutions to address global societal challenges\u003c/em\u003e. Gland, Switzerland: IUCN.\u003c/li\u003e\n\u003cli\u003eCoastal Research Institute (CoRI) (2012) \u003cem\u003eHead master initiative for the Nile Delta coastal hydrodynamics, sediment transport, erosion, and defense schemes in view of climate change and ICZM\u003c/em\u003e. Ministry of Water Resources and Irrigation.\u003c/li\u003e\n\u003cli\u003eCredit Suisse Research Institute (2022) \u003cem\u003eGlobal wealth databook 2022\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eDasgupta, S., Laplante, B., Meisner, C., Wheeler, D. and Yan, J. (2009) \u0026apos;The impact of sea level rise on developing countries: A comparative analysis\u0026apos;, \u003cem\u003eClimatic Change\u003c/em\u003e, 93(3-4), pp. 379\u0026ndash;388.\u003c/li\u003e\n\u003cli\u003eDepsky, N., et al. (2023) \u0026apos;Valuing the costs of managed retreat\u0026apos;, \u003cem\u003eNature Climate Change\u003c/em\u003e, 13, pp. 1172\u0026ndash;1174.\u003c/li\u003e\n\u003cli\u003eDickson, E., et al. (2022) \u003cem\u003eUrban risk assessments: Understanding disaster and climate risk in cities\u003c/em\u003e. Washington, D.C.: World Bank.\u003c/li\u003e\n\u003cli\u003eDorst, H., et al. (2022) \u0026apos;A systemic approach to understanding and overcoming barriers to mainstreaming nature-based solutions in urban planning\u0026apos;, \u003cem\u003eAmbio\u003c/em\u003e, 51(5), pp. 1185-1198.\u003c/li\u003e\n\u003cli\u003eEgyptian Environmental Affairs Agency (EEAA) (2016) \u003cem\u003eEgypt\u0026apos;s third national communication report under the United Nations Framework Convention on Climate Change\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eEl-Raey, M., Dewidar, K. and El-Hattab, M. (1999) \u0026apos;Adaptation to the impacts of sea level rise in Egypt\u0026apos;, \u003cem\u003eMitigation and Adaptation Strategies for Global Change\u003c/em\u003e, 4(3-4), pp. 343\u0026ndash;361.\u003c/li\u003e\n\u003cli\u003eEsteves, L.S. (2014) \u003cem\u003eCoastal management\u003c/em\u003e. John Wiley \u0026amp; Sons.\u003c/li\u003e\n\u003cli\u003eFaivre, N., et al. (2017) \u0026apos;Nature-based solutions in the EU: Innovating with nature to address social, economic and environmental challenges\u0026apos;, \u003cem\u003eEnvironmental Research\u003c/em\u003e, 159, pp. 509-518.\u003c/li\u003e\n\u003cli\u003eFanchette, S. (2025) \u0026apos;Delta vulnerability linked to climate and environmental changes: Metropolization challenges in Asian and Nile deltas\u0026apos;, in **.\u003c/li\u003e\n\u003cli\u003eFrihy, O.E. and El-Sayed, M.K. (2013) \u0026apos;Vulnerability risk assessment and adaptation to climate change induced sea level rise along the Mediterranean coast of Egypt\u0026apos;, \u003cem\u003eMitigation and Adaptation Strategies for Global Change\u003c/em\u003e, 18(8), pp. 1215\u0026ndash;1237.\u003c/li\u003e\n\u003cli\u003eGreen Climate Fund (GCF) (2017) \u003cem\u003eFunding Proposal: Enhancing Climate Change Adaptation in the North Coast and Nile Delta Regions in Egypt (FP053)\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eGriscom, B.W., et al. (2017) \u0026apos;Natural climate solutions\u0026apos;, \u003cem\u003eProceedings of the National Academy of Sciences\u003c/em\u003e, 114(44), pp. 11645\u0026ndash;11650.\u003c/li\u003e\n\u003cli\u003eHaddad, E.A., et al. (2025) \u0026apos;Deluge of costs: Navigating the economic impacts of flooding in Egyptian port cities\u0026apos;, \u003cem\u003eGlobal Challenges \u0026amp; Regional Science\u003c/em\u003e, 3, 100015.\u003c/li\u003e\n\u003cli\u003eHassan, M.A. and Abdrabo, M.A. (2013) \u0026apos;Vulnerability of the Nile Delta coastal areas to inundation by sea level rise\u0026apos;, \u003cem\u003eEnvironmental Monitoring and Assessment\u003c/em\u003e, 185(8), pp. 6607\u0026ndash;6616.\u003c/li\u003e\n\u003cli\u003eHereher, M.E. (2015) \u0026apos;Coastal vulnerability assessment for Egypt\u0026apos;s Mediterranean coast\u0026apos;, \u003cem\u003eGeomatics, Natural Hazards and Risk\u003c/em\u003e, 6(4), pp. 342\u0026ndash;355.\u003c/li\u003e\n\u003cli\u003eIHCantabria (2016) \u003cem\u003eICZM in the Northern Coast of Egypt - A Scoping Study. Technical Evaluation Report\u003c/em\u003e. UNDP.\u003c/li\u003e\n\u003cli\u003eIHCantabria (2017) \u003cem\u003eICZM Scoping Study in the Northern Coast of Egypt: Volume I Final Study Report\u003c/em\u003e. UNDP.\u003c/li\u003e\n\u003cli\u003eIntergovernmental Panel on Climate Change (IPCC) (2019) \u003cem\u003eIPCC special report on the ocean and cryosphere in a changing climate\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eIntergovernmental Panel on Climate Change (IPCC) (2021) \u003cem\u003eClimate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report\u003c/em\u003e. Cambridge: Cambridge University Press.\u003c/li\u003e\n\u003cli\u003eIntergovernmental Panel on Climate Change (IPCC) (2022) \u003cem\u003eClimate Change 2022: Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Sixth Assessment Report\u003c/em\u003e. Cambridge: Cambridge University Press.\u003c/li\u003e\n\u003cli\u003eKibii, C., et al. (2025) \u003cem\u003eNature-based solutions for climate change adaptation and resilience in urban informal settlements: Insights from Kenya and Argentina\u003c/em\u003e. WeAdapt.\u003c/li\u003e\n\u003cli\u003eKumar, P., et al. (2020) \u0026apos;Towards a sustainable and resilient future: A review of nature-based solutions for coastal protection\u0026apos;, \u003cem\u003eJournal of Environmental Management\u003c/em\u003e, 269, 110759.\u003c/li\u003e\n\u003cli\u003eMcBean, E. and Huang, G. (2017) \u0026apos;Sustainability risks of coastal cities from climate change\u0026apos;, \u003cem\u003eThe Global Environmental Engineers\u003c/em\u003e, 4(1), pp. 1-10.\u003c/li\u003e\n\u003cli\u003eMeerow, S., Newell, J.P. and Stults, M. (2016) \u0026apos;Defining urban resilience: A review\u0026apos;, \u003cem\u003eLandscape and Urban Planning\u003c/em\u003e, 147, pp. 38\u0026ndash;49.\u003c/li\u003e\n\u003cli\u003eNarayan, S., et al. (2016) \u0026apos;The effectiveness, costs and coastal protection benefits of natural and nature-based defences\u0026apos;, \u003cem\u003ePloS one\u003c/em\u003e, 11(5), e0154735.\u003c/li\u003e\n\u003cli\u003eNessh\u0026ouml;ver, C., et al. (2017) \u0026apos;The science, policy and practice of nature-based solutions: An interdisciplinary perspective\u0026apos;, \u003cem\u003eScience of the Total Environment\u003c/em\u003e, 579, pp. 1215\u0026ndash;1227.\u003c/li\u003e\n\u003cli\u003ePathak, A., Glick, P., et al. (2024) \u003cem\u003eIncorporating nature-based solutions into community climate adaptation planning\u003c/em\u003e. Climate Resilience Fund.\u003c/li\u003e\n\u003cli\u003eRanger, N. and van Raalte, D. (2023) \u003cem\u003eFinancing nature-based solutions for adaptation\u003c/em\u003e. Global Center on Adaptation \u0026amp; University of Oxford.\u003c/li\u003e\n\u003cli\u003eRanasinghe, P.R. (2025) \u003cem\u003eNature-based solutions for urban climate resilience: Assessment\u003c/em\u003e. University of Texas at Arlington.\u003c/li\u003e\n\u003cli\u003eSaleh, M. (2018) \u003cem\u003eClimate change impacts on Egypt\u0026apos;s coastal cities: The case of Alexandria\u003c/em\u003e. American University in Cairo.\u003c/li\u003e\n\u003cli\u003eSeddon, N., et al. (2020) \u0026apos;Understanding the value and limits of nature-based solutions to climate change and other global challenges\u0026apos;, \u003cem\u003ePhilosophical Transactions of the Royal Society B\u003c/em\u003e, 375(1794), 20190120.\u003c/li\u003e\n\u003cli\u003eShirley, R., Onyango, S., Manyifika, M. and Takele, E. (2025) \u003cem\u003eFinancing urban resilience: Making nature-based solutions central to Africa\u0026apos;s development agenda\u003c/em\u003e. World Resources Institute.\u003c/li\u003e\n\u003cli\u003eStockholm Environment Institute (SEI) (2022) \u003cem\u003eAssessing finance for nature-based solutions\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eTemmerman, S., et al. (2013) \u0026apos;Ecosystem-based coastal defence in the face of global change\u0026apos;, \u003cem\u003eNature\u003c/em\u003e, 504(7478), pp. 79\u0026ndash;83.\u003c/li\u003e\n\u003cli\u003eUnited Nations Development Programme (UNDP) (2017) \u003cem\u003eFeasibility study for integrated climate change adaptation in five vulnerable hotspots in the Nile Delta\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eUnited Nations Environment Programme (UNEP) (2023) \u003cem\u003eState of finance for nature\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eUnited Nations Environment Programme Finance Initiative (UNEP FI) (2023) \u003cem\u003eNature-based solutions in urban areas: A primer for financial institutions\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eWorld Bank (2022) \u003cem\u003eEgypt country climate and development report (CCDR)\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eWorld Bank (2023) \u003cem\u003eAssessing the benefits and costs of nature-based solutions for climate resilience: A guideline for project developers\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eWorld Bank (2025) \u003cem\u003eMobilizing nature-based solutions (NBS) for disaster and climate resilience\u003c/em\u003e.\u003c/li\u003e\n\u003cli\u003eWWF (2022) \u003cem\u003eFinancing nature-based solutions: A guide for practitioners\u003c/em\u003e.\u003c/li\u003e\n\u003c/ol\u003e"}],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":true,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":false,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":false,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"Climate Finance, Nature-Based Solutions (NbS), Urban Resilience, Nile Delta, Coastal Adaptation, Sea-Level Rise, Egypt","lastPublishedDoi":"10.21203/rs.3.rs-7979335/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-7979335/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eThe Nile Delta, a global climate vulnerability hotspot, faces compound risks from sea-level rise (SLR), land subsidence, and coastal erosion, threatening its densely populated urban centers and critical economic assets. A significant disconnect persists between available international climate finance and the on-the-ground implementation of cost-effective Nature-Based Solutions (NbS) for urban resilience in Egypt. This paper develops and applies a novel integrated framework to bridge this gap by systematically linking climate finance mechanisms with prioritized NbS interventions and measurable urban resilience outcomes. The framework integrates GIS-based vulnerability modeling, multi-criteria assessment of NbS, and a review of climate finance instruments. It is applied to vulnerable coastal governorates, including Damietta, Port Said, and the Rosetta/Burullus region. The analysis identifies specific \"hotspots\" and prioritizes context-specific NbS, such as soft dikes for critical infrastructure protection and dune restoration for tourism-dependent areas. A financial viability assessment demonstrates that the co-benefits of NbS (e.g., biodiversity enhancement, tourism revenue) often exceed implementation costs, presenting a strong case for investment. The framework provides a strategic pathway for Egyptian policymakers and international funders to overcome institutional and financial barriers, scale up NbS implementation, and transition from a cycle of maladaptive hard engineering to sustainable, resilient coastal governance.\u003c/p\u003e","manuscriptTitle":"Leveraging Climate Finance to Integrate Nature-Based Solutions for Urban Resilience in Nile Delta Vulnerable Coastal Zones","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-11-19 11:57:14","doi":"10.21203/rs.3.rs-7979335/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"d93f97ca-ce4c-40f5-a26c-814074ff70a2","owner":[],"postedDate":"November 19th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2025-12-11T08:24:36+00:00","versionOfRecord":[],"versionCreatedAt":"2025-11-19 11:57:14","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-7979335","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-7979335","identity":"rs-7979335","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}