| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
High-Resolution Morphobathymetric Analysis and Evolution of Capbreton Submarine Canyon Head (Southeast Bay of Biscay—French Atlantic Coast) over the Last Decade Using Descriptive and Numerical Modeling
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| Autores: |
Mazieres, Alais
Gillet, Herve
Castelle, Bruno
Mulder, Thierry
Guyot, Corentin
Garlan, Thierry
Mallet, Cyril
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| Data: |
2014-05
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| Ano: |
2014
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| Palavras-chave: |
Longshore drift
Submarine canyon
Capbreton
Hydrodynamic modeling
Sediment transport
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| Resumo: |
In this study, the Capbreton canyon head, just off the coast, is investigated using high-resolution multibeam bathymetry datasets, sediment samples and numerical modeling. The HR bathymetry analysis reveals a morphological connection between the longshore trough and the head of the canyon. The analysis of recent sediment samples shows a clear correlation between the sediment of the canyon head and that of the nearshore. Hydrodynamic modeling (a coupled wave-flow model) shows that for high-energy waves, the rotational nature of surf-zone circulation reverses and wave-induced currents have the potential to transport large quantities of nearshore sands toward the canyon head. All these arguments support the assumption that the canyon head captures a part of the sand transported by longshore drift. Over the 15 years of observation (1998–2013), time-lapse bathymetry shows that the floor of the canyon head and one lateral gully network experienced significant morphological reworking. In terms of hazards, despite this strong activity, the position of the canyon head and the profile of its longitudinal slope remained stable and appears as a comforting factor. However, the activity of unusual lateral erosions needs to be monitored.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00180/29118/27524.pdf
DOI:10.1016/j.margeo2014.03.001
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| Editor: |
Elsevier Science Bv
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| Relação: |
http://archimer.ifremer.fr/doc/00180/29118/
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| Formato: |
application/pdf
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| Fonte: |
Marine Geology (0025-3227) (Elsevier Science Bv), 2014-05 , Vol. 351 , P. 1-12
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| Direitos: |
2014 Elsevier B.V. All rights reserved.
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