Wave Attenuation and Containment Dike Loading at a Marsh-Creation Site in Coastal Louisiana: SWAN-Based Assessment of Bottom-Roughness

Wave Attenuation and Containment Dike Loading at a Marsh-Creation Site in Coastal Louisiana: SWAN-Based Assessment of Bottom-Roughness | 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 Wave Attenuation and Containment Dike Loading at a Marsh-Creation Site in Coastal Louisiana: SWAN-Based Assessment of Bottom-Roughness Abhishek K. Tiwari, Jay Wang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8571090/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 Coastal Louisiana continues to experience rapid wetland loss, reducing the capacity of shallow nearshore areas to dissipate storm-driven waves before they reach engineered containment dikes. This study quantifies offshore-to-nearshore wave transformation and evaluates the resulting wave runup and hydrodynamic loading on a representative containment dike constructed for marsh creation in Plaquemines Parish, Louisiana. A 25-year return-period offshore wave condition was derived from long-term Wave Information Study hindcast data and propagated using the third-generation spectral wave model SWAN. Simulations were performed for two idealized foreshore conditions: a bare-bed scenario and a vegetated shallow-water scenario represented through enhanced bottom friction. Results indicate strong wave attenuation across the Louisiana inner shelf, with inclusion of vegetation-induced dissipation reducing nearshore wave heights and leading to 14–25% reductions in wave runup and 27–44% reductions in total quasi-hydrostatic loading on the containment dike across multiple still-water levels. While absolute response magnitudes depend on modeling assumptions, the relative differences between bare and vegetated foreshore scenarios are robust. The findings highlight the effectiveness of vegetation-induced dissipation in mitigating wave impacts on coastal infrastructure and support the use of nature-based features in marsh creation and coastal protection projects. Coastal wave attenuation SWAN model Vegetation-induced dissipation Marsh creation dikes Wave runup Hydrodynamic loading Nature-based coastal protection Full Text 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. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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Bottom-Roughness","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"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":"Coastal wave attenuation, SWAN model, Vegetation-induced dissipation, Marsh creation dikes, Wave 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This study quantifies offshore-to-nearshore wave transformation and evaluates the resulting wave runup and hydrodynamic loading on a representative containment dike constructed for marsh creation in Plaquemines Parish, Louisiana. A 25-year return-period offshore wave condition was derived from long-term Wave Information Study hindcast data and propagated using the third-generation spectral wave model SWAN. Simulations were performed for two idealized foreshore conditions: a bare-bed scenario and a vegetated shallow-water scenario represented through enhanced bottom friction. Results indicate strong wave attenuation across the Louisiana inner shelf, with inclusion of vegetation-induced dissipation reducing nearshore wave heights and leading to 14\u0026ndash;25% reductions in wave runup and 27\u0026ndash;44% reductions in total quasi-hydrostatic loading on the containment dike across multiple still-water levels. While absolute response magnitudes depend on modeling assumptions, the relative differences between bare and vegetated foreshore scenarios are robust. 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