2026-04-17T04:21:00Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/4563072026-03-09T04:38:34Zcom_2072_1033col_2072_452950

2026-03-09T04:38:34Z urn:hdl:2117/456307 Role of the initial topobathymetry in washover deposit formation during extreme events Carrion Bertran, Nil Calvete Manrique, Daniel Ribas Prats, Francesca Àrees temàtiques de la UPC::Física::Física de fluids Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Oceanografia Àrees temàtiques de la UPC::Matemàtiques i estadística::Matemàtica aplicada a les ciències Washover deposits Morphodynamic modeling Topobathymetric variability Wave group chronology XBeach model Mediterranean beach Low-lying beaches, important ecological and socio-economic assets, are vulnerable to storm erosion and flooding impacts, which are expected to increase due to climate change. This conceptual study uses the 2DH XBeach model to simulate the influence of the initial topobathymetric shape on the washover deposit formation during a beach overwash caused by an extreme storm, including a quantification of the wave chronology uncertainty. The employed initial alongshore-uniform (AU) topobathymetries have different cross-shore profiles, representing the real variability of Mediterranean beaches. The analysis also incorporates the presence of common alongshore-rhythmic morphological patterns, such as megacusps, rhythmic dunes, and crescentic bars, with varying wavelengths. The results in the AU scenarios show that washover deposits are also periodic alongshore, forming through a 2D self-organization process that establishes the natural wavelength of the modeled dry beach. The presence of megacusps in the initial topobathymetry can enhance washover deposit volumes up to a factor 4, especially for large initial wavelengths. Rhythmic dunes also influence the spatial distribution of the deposits, while crescentic bars generally have little direct effect on the deposit formation. These findings highlight the importance of using real and up-to-date topobathymetric data, including the presence of common alongshore-rhythmic morphological patterns, in modeling storm impacts on beaches. Furthermore, modeling studies under future climate change scenarios, must consider the uncertainty associated with the unknown shape of the topobathymetry and wave group chronology. The results could also have implications for developing effective coastal management strategies. Research funding Agencia Estatal de Investigación. Grant Numbers: PID2021-124272OB-C22, TED2021-130321B-I00, PID2024-157818OB-C21 Peer Reviewed Postprint (published version) 2026-03-09T04:38:34Z 2026-03-09T04:38:34Z 2026-02-12 Article https://hdl.handle.net/2117/456307 https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2025JF008755 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-124272OB-C21/ES/RESOLVIENDO CARENCIAS DE CONOCIMIENTO CRITICAS PARA MEJORAR LAS PROYECCIONES MORFODINAMICAS DE COSTAS BAJAS EN EL SIGLO XXI: OBSERVACIONES (MOLLY-OBS)/ info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/TED2021-130321B-I00/ES/Soluciones basadas en la naturaleza para la adaptación al cambio climático de las costas deltaicas: evaluación de las respuestas morfodinámicas info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2024-157818OB-C21/Coastal morphodynamic processes driving tipping points at multiple scales in sedimentary beaches under global changes: modelling approach http://creativecommons.org/licenses/by/4.0/ Open Access Attribution 4.0 International American Geophysical Union (AGU)