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Morphodynamics of nearshore rhythmic sandbars in a mixed-energy environment (SW France): 2. Physical forcing analysis

hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorLAFON, V.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
hal.structure.identifierService d'urologie [Rouen]
dc.contributor.authorDUPUIS, H.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorBUTEL, Rémi
dc.contributor.authorCASTELLE, Bruno
IDREF: 087596520
hal.structure.identifierLaboratoire d'aérologie [LAERO]
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
hal.structure.identifierLaboratory for lasers energetics - LLE (New-York, USA)
hal.structure.identifierInstitut Français du Pétrole
hal.structure.identifierService d'Hématologie [CHRU Nancy]
hal.structure.identifierCentre Hospitalier Universitaire de Nantes = Nantes University Hospital [CHU Nantes]
hal.structure.identifierLaboratoire de Génie Informatique, de Production et de Maintenance [LGIPM]
hal.structure.identifierInstitut de Transplantation et de Recherche en Transplantation [CHU Nantes] [ITERT]
dc.contributor.authorMICHEL, D.
dc.contributor.authorHOWA, H.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorDE MELO APOLUCENO, D.
dc.date.accessioned2022-05-05T09:24:13Z
dc.date.available2022-05-05T09:24:13Z
dc.date.issued2005-01-01
dc.identifier.issn0272-7714
dc.identifier.uriorcid:0000-0003-1740-7395:10.1016/j.ecss.2005.06.011
dc.identifier.urioai:crossref.org:10.1016/j.ecss.2005.06.011
dc.identifier.uriftgriffithuniv:oai:www98.griffith.edu.au:10072/24448
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/139982
dc.description.abstractEnThe morphology and migration of rhythmic intertidal ridge and runnel systems, and subtidal crescentic bars that border the southwest coast of France were characterized using in situ surveys and maps obtained by remote-sensing methods. The period from 1986 to 2000 was investigated. A total of 35 km of coast was mapped. This data set shows several specificities, the origin of which are examined in the present report using hydrodynamic data. A complete analysis of the influence of wave climate on both the shape and the movements of these rhythmic sedimentary patterns was performed. In addition, SWAN and MORPHODYN-coupled numerical models were used to provide quantification of both wave breaking and longshore currents for wave parameters that were representative of the mean values and of the energetic conditions. This study demonstrated the short time response of intertidal systems to the wave forcing. When the offshore significant wave height (Hs) was lower than 2.5 m, regular coastal ridge and runnel systems developed in the intertidal zone and migrated in the longshore-drift direction at a rate of 1.7-3.1 mday-1. By contrast, the ridge and runnel system morphology abruptly changed when the Hs exceeded 2.5 m, and after the storm, the typical ridge and runnel rhythmic topography was recovered within 5e9 days. The crescentic bars, which had a convex seaward shape, were affected by waves withHs values greater than 3 m (slightly less for short waves). Depending on the wave orientation, the crescentic bars moved in the longshore-drift direction at a rate that reached 1 m day-1. The data suggested a slight negative correlation between the mean alongshore length of the crescentic bar and the mean Hs. Finally, it seemed that increasing the wave obliquity with respect to the coast resulted in the flattening of the crescentic bars. Thus, coupling Spot and in situ mapping to hydrodynamic records allow the characterization of coastal morphology and dynamics, with time and space samplings that are particularly well adapted to the little studied alongshore morphodynamics. This approach should improve the difficult parameterization of morphodynamic models in high-energy environments.
dc.publisherElsevier BV
dc.sourceorcid
dc.sourcecrossref
dc.sourcebase
dc.title.enMorphodynamics of nearshore rhythmic sandbars in a mixed-energy environment (SW France): 2. Physical forcing analysis
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.ecss.2005.06.011
dc.subject.halSciences de l'environnement
bordeaux.journalEstuarine, Coastal and Shelf Scienceen_US
bordeaux.page449-462
bordeaux.volume65
bordeaux.issue3
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionCNRS
bordeaux.import.sourcedissemin
hal.identifierinsu-03619084
hal.version1
hal.date.transferred2022-09-06T10:21:42Z
hal.exporttrue
workflow.import.sourcedissemin
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Estuarine,%20Coastal%20and%20Shelf%20Science&rft.date=2005-01-01&rft.volume=65&rft.issue=3&rft.spage=449-462&rft.epage=449-462&rft.eissn=0272-7714&rft.issn=0272-7714&rft.au=LAFON,%20V.&DUPUIS,%20H.&BUTEL,%20R%C3%A9mi&CASTELLE,%20Bruno&MICHEL,%20D.&rft.genre=article


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