Data/hora: 07/06/2024 11:04:22

Provedor de dados: | 5
País: | France
Título: | Influence of storms on tidal dune mobility in the Strait of Dover
Autores: | Le Bot, Sophie; Trentesaux, Alain; Garlan, Thierry; Berne, Serge; Chamley, Hervé.
Data: | 2000-03
Ano: | 2000
Palavras-chave: | Tempêtes; Dunes tidales; Dynamique sédimentaire; Détroit du Pas de Calais; Storms; Tidal dunes; Sedimentary dynamics; Strait of Dover.
Resumo: | The present paper deals with dune dynamics in a zone of the Strait of Dover located in the sea lane running into the North Sea. The dunes, widespread in this 35-m depth area, are mobile sedimentary structures (up to 40 m.yr(-1)) that culminate at a maximum of 22 m depth and endanger navigation as well as submarine man-made structures (cables, pipelines). Single- and multibeam bathymetric data, coupled with seismic data, allow us to follow dune displacements over different time scales. A net bedload parting zone has been displayed and divides the area into two parts, SE and NW. However, according to the considered time-scale, dune movements present Variations in intensity and direction. Over a long-term period (decades), sedimentary dynamics fit the regional scheme of the residual tidal currents that induce transport toward the SW and the NE in the respective SE and NW parts of the studied area. Over a medium-term period (several years), meteorological data show that a high frequency of storm winds alters the residual sand transport characteristics by strengthening, slowing or reversing the effect of the tidal currents and can lead to the reversal of dune asymetry.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/2000/publication-519.pdf

DOI:10.1016/S0399-1784(00)00115-8

https://archimer.ifremer.fr/doc/00000/519/

Editor: | Elsevier
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Elsevier), 2000-03 , Vol. 23 , N. 2 , P. 129-141

Fonte:

2000 Ifremer/CNRS/IRD/Éditions scientifiques et médicales Elsevier SAS. All rights reserved.

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