Dynamics of inner-shelf, multi-scale bedforms off the south Aquitaine coast over three decades (Southeast Bay of Biscay, France)
| dc.rights.license | open | en_US |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | MAZIERES, Alais | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | GILLET, Herve | |
| hal.structure.identifier | Bureau de Recherches Géologiques et Minières [BRGM] | |
| dc.contributor.author | IDIER, Déborah | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | MULDER, Thierry | |
| hal.structure.identifier | Service Hydrographique et Océanographique de la Marine [SHOM] | |
| dc.contributor.author | GARLAN, Thierry | |
| hal.structure.identifier | Bureau de Recherches Géologiques et Minières [BRGM] | |
| dc.contributor.author | MALLET, Cyrill | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | MARIEU, Vincent | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | HANQUIEZ, Vincent | |
| dc.date.accessioned | 2024-05-30T12:52:47Z | |
| dc.date.available | 2024-05-30T12:52:47Z | |
| dc.date.issued | 2015-01-01 | |
| dc.identifier.issn | 0278-4343 | en_US |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/200162 | |
| dc.description.abstractEn | This 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.iso | EN | en_US |
| dc.subject.en | Sorted bedforms | |
| dc.subject.en | Inner shelf | |
| dc.subject.en | Aquitaine coast | |
| dc.subject.en | Shoreward | |
| dc.subject.en | Sand patches | |
| dc.subject.en | Time lapse survey | |
| dc.title.en | Dynamics of inner-shelf, multi-scale bedforms off the south Aquitaine coast over three decades (Southeast Bay of Biscay, France) | |
| dc.type | Article de revue | en_US |
| dc.identifier.doi | 10.1016/j.csr.2014.11.002 | en_US |
| dc.subject.hal | Planète et Univers [physics]/Sciences de la Terre/Océanographie | en_US |
| bordeaux.journal | Continental Shelf Research | en_US |
| bordeaux.page | pp. 23-36 | en_US |
| bordeaux.hal.laboratories | EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805 | en_US |
| bordeaux.issue | 92 | en_US |
| bordeaux.institution | Université de Bordeaux | en_US |
| bordeaux.institution | CNRS | en_US |
| bordeaux.team | GEOLSED | en_US |
| bordeaux.peerReviewed | oui | en_US |
| bordeaux.inpress | non | en_US |
| bordeaux.import.source | hal | |
| hal.identifier | hal-01100289 | |
| hal.version | 1 | |
| hal.popular | non | en_US |
| hal.audience | Internationale | en_US |
| hal.export | false | |
| workflow.import.source | hal | |
| dc.rights.cc | Pas de Licence CC | en_US |
| bordeaux.COinS | ctx_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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