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dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMAZIERES, Alais
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorGILLET, Herve
hal.structure.identifierBureau de Recherches Géologiques et Minières [BRGM]
dc.contributor.authorIDIER, Déborah
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMULDER, Thierry
hal.structure.identifierService Hydrographique et Océanographique de la Marine [SHOM]
dc.contributor.authorGARLAN, Thierry
hal.structure.identifierBureau de Recherches Géologiques et Minières [BRGM]
dc.contributor.authorMALLET, Cyrill
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMARIEU, Vincent
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorHANQUIEZ, Vincent
dc.date.accessioned2024-05-30T12:52:47Z
dc.date.available2024-05-30T12:52:47Z
dc.date.issued2015-01-01
dc.identifier.issn0278-4343en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/200162
dc.description.abstractEnThis paper aims to investigate the seabed morphodynamics of the south Aquitaine inner shelf in the area known as “La Salie” (150 km2, Atlantic ocean, west coast of France), through a descriptive and comparative analysis (time lapse of 29 years) of geophysical and sedimentological datasets.At a water depth of 24–50 m, four orders of sedimentary body types were observed at different scales. The first order are large cross-shore “morphological ridges,” corresponding with the properties of very large sorted bedforms. The second order consisted in patchy sorted bedforms, composed of alternately medium to fine sand patches (0.5–2 m in thickness), cut by smaller, elongated coarse sediment depressions. In particular, the data from the sub-bottom profiler revealed that sand patches predominantly overlayed the coarse-grained blankets on the eastern (shoreward) extremities, while coarse-grained blanket wedges were found in front of the sand patches (southwestward) or locally overlying them on the southwestern extremities. The third order of bedforms involved groups of dune-like features (fine/medium sand), lying in wide areas of coarse-grained sediment. Finally, in the fouth order, the entire inner shelf was covered with wave-generated ripples, oriented N15°, that were larger where sediments were coarse (wavelengths of 2.2 m) than where sediments were fine (wavelengths of 0.3 m). Over the past 29 years, at a large scale of observation, patchy sorted bedforms have remained remarkably persistent, as has their overall appearance. However, at a smaller scale, weak but constant movements were observed. The coarse depressions have become elongated at their extremities (by a maximum of 300 m over 15 years), and certain coarse/fine sediment boundaries have moved toward the northeast and southeast (by a maximum of 75 m over 12 years). The general movement has been shoreward as has the migration of third-order submarine dune-like features. The persistence of sorted bedforms thus appears to be the consequence of sediment sorting feedback and recurrent storm events.
dc.language.isoENen_US
dc.subject.enSorted bedforms
dc.subject.enInner shelf
dc.subject.enAquitaine coast
dc.subject.enShoreward
dc.subject.enSand patches
dc.subject.enTime lapse survey
dc.title.enDynamics of inner-shelf, multi-scale bedforms off the south Aquitaine coast over three decades (Southeast Bay of Biscay, France)
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.csr.2014.11.002en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Océanographieen_US
bordeaux.journalContinental Shelf Researchen_US
bordeaux.pagepp. 23-36en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue92en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamGEOLSEDen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-01100289
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Continental%20Shelf%20Research&rft.date=2015-01-01&rft.issue=92&rft.spage=pp.%2023-36&rft.epage=pp.%2023-36&rft.eissn=0278-4343&rft.issn=0278-4343&rft.au=MAZIERES,%20Alais&GILLET,%20Herve&IDIER,%20D%C3%A9borah&MULDER,%20Thierry&GARLAN,%20Thierry&rft.genre=article


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