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dc.rights.licenseopenen_US
dc.contributor.authorRODRIGUEZ PADILLA, Isaac
dc.contributor.authorCASTELLE, Bruno
IDREF: 087596520
dc.contributor.authorMARIEU, Vincent
dc.contributor.authorMORICHON, Denis
dc.date.accessioned2022-11-08T15:41:36Z
dc.date.available2022-11-08T15:41:36Z
dc.date.issued2022-08-09
dc.identifier.issn2072-4292en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/170236
dc.description.abstractEnAlthough geologically constrained sandy beaches are ubiquitous along wave-exposed coasts, there is still a limited understanding of their morphological response, particularly under storm conditions, which is mainly due to a critical lack of nearshore bathymetry observations. This paper examines the potential to derive bathymetries from video imagery under challenging wave conditions in order to investigate headland control on morphological beach response. For this purpose, a video-based linear depth inversion algorithm is applied to three consecutive weeks of frames collected during daylight hours from a single fixed camera located at La Petite Chambre d’Amour beach (Anglet, SW France). Video-derived bathymetries are compared against in situ topo-bathymetric surveys carried out at the beginning and end of the field experiment in order to assess the performance of the bathymetric estimates. The results show that the rates of accretion/erosion within the surf zone are strongly influenced by the headland, whereas the beach morphological response can be classified into three main regimes depending on the angle of wave incidence θp: (1) under deflection configuration (θp>0°), the alongshore sediment transport was trapped at the updrift side of the headland, promoting sand accretion. (2) Under shadowed configuration (θp<0°), the interruption of the longshore current drove a deficit of sand supply at the downdrift side of the headland, leading to an overall erosion in the surf zone. (3) Under shore-normal configuration (θp=0°), rip channels developed, and up-state beach transition was observed. A comparison between video-derived bathymetries and surveys shows an overall root mean square error (RMSE) around 0.49 to 0.57 m with a bias ranging between −0.36 and −0.29 m. The results show that video-derived bathymetries can provide new insight into the morphological change driven by storm events. The combination of such inferred bathymetry with video-derived surface current data is discussed, showing great potential to address the coupled morphodynamics system under time-varying wave conditions.
dc.description.sponsorshipComprendre et prévoir l'évolution contemporaine du traite de côte dans un contexte de changement climatique par assimilation de données satellite dans les modèles hybrides - ANR-21-CE01-0015en_US
dc.language.isoENen_US
dc.rightsAttribution 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/*
dc.subject.enbeach morphodynamics
dc.subject.encBathy
dc.subject.endepth inversion
dc.subject.engeological control
dc.subject.envideo monitoring
dc.title.enVideo-Based Nearshore Bathymetric Inversion on a Geologically Constrained Mesotidal Beach during Storm Events
dc.typeArticle de revueen_US
dc.identifier.doi10.3390/rs14163850en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalRemote Sensingen_US
bordeaux.volume14en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue16en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
hal.identifierhal-03830551
hal.version1
hal.exportfalse
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Remote%20Sensing&amp;rft.date=2022-08-09&amp;rft.volume=14&amp;rft.issue=16&amp;rft.eissn=2072-4292&amp;rft.issn=2072-4292&amp;rft.au=RODRIGUEZ%20PADILLA,%20Isaac&amp;CASTELLE,%20Bruno&amp;MARIEU,%20Vincent&amp;MORICHON,%20Denis&amp;rft.genre=article


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