Simulation of floods under the influence of effective factors in hydraulic and hydrological models using HEC-RAS and MIKE 21

Simulation of floods under the influence of effective factors in hydraulic and hydrological models using HEC-RAS and MIKE 21 | 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 Case Report Simulation of floods under the influence of effective factors in hydraulic and hydrological models using HEC-RAS and MIKE 21 Sara Ansarifard, Morteza Eyvazi, Mahsa kalantari, behrooz mohseni, and 3 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4863234/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 30 Oct, 2024 Read the published version in Discover Water → Version 1 posted 14 You are reading this latest preprint version Abstract Simulating floods and creating vulnerability maps are essential in urban watershed management systems. The present research aimed to simulate floods and assess floodplain risk in the Khalkai watershed located in Gilan Province, Iran. This river is characterized by extensive agricultural areas and urban areas that become flooded during most rainy seasons. Hence, investigating this topic is important. In this research, a two-dimensional hydrodynamic modeling approach was used to simulate floods with probability return periods of 50, 100, and 500 years, under the influence of GPS topographic mapping compared with DEMs extracted from satellite images. Therefore, MIKE21 and HEC-RAS 6.3 software were utilized to construct flood inundation maps and select the best model for the Khalkai watershed. The following objectives were considered in this study: 1. The impact of the roughness coefficient index and curve number was examined due to increasing simulation accuracy, so the modeling was carried out for both steady and flood flows. By examining the rate of change in the roughness coefficient index and the curve number, it was shown that these two factors vary depending on the type of flow state in the simulation. The main reasons for this difference are the flow velocity, infiltration, and flow regime in the area, which are under critical conditions due to human interventions such as bridge and wall construction, which increase the probability of significant damage. 2. The accuracy of floodplain estimation was evaluated using the abovementioned models with Sentinel satellite images taken during a 25-year flood event. The accuracy of the models used in estimating the floodplain density was subsequently assessed. HEC-RAS MIKE21 flood inundation Hec-Hms manning’s roughness coefficient Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 30 Oct, 2024 Read the published version in Discover Water → Version 1 posted Editorial decision: Revision requested 09 Sep, 2024 Reviewers agreed at journal 05 Sep, 2024 Reviews received at journal 05 Sep, 2024 Reviewers agreed at journal 05 Sep, 2024 Reviewers agreed at journal 05 Sep, 2024 Reviews received at journal 02 Sep, 2024 Reviews received at journal 01 Sep, 2024 Reviewers agreed at journal 28 Aug, 2024 Reviewers agreed at journal 26 Aug, 2024 Reviewers agreed at journal 26 Aug, 2024 Reviewers invited by journal 23 Aug, 2024 Editor assigned by journal 19 Aug, 2024 Submission checks completed at journal 19 Aug, 2024 First submitted to journal 05 Aug, 2024 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. 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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-4863234","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Case Report","associatedPublications":[],"authors":[{"id":351279588,"identity":"0cbe25fe-9012-487e-957d-fb8e11e6162e","order_by":0,"name":"Sara Ansarifard","email":"","orcid":"","institution":"Islamic Azad University","correspondingAuthor":false,"prefix":"","firstName":"Sara","middleName":"","lastName":"Ansarifard","suffix":""},{"id":351279589,"identity":"171658b2-7562-4515-9287-b1892f9c36f7","order_by":1,"name":"Morteza Eyvazi","email":"","orcid":"","institution":"University of 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