Arrêt de service programmé du vendredi 10 juin 16h jusqu’au lundi 13 juin 9h. Pour en savoir plus
Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Longshore sediment flux hindcast: spatio-temporal variability along the SW Atlantic coast of France

Abstract : The Aquitanian coast (SW France) is exposed to high-energy waves, and subject to an overall shoreline erosion of 1 to 3 m/year. Engineering practices in this area requires the knowledge of longshore sediment fluxes. The reference values of direction and variability have been estimated 33 years ago with data available at that time. More recent estimations have been done on limited area and time span. The present study aims at: (1) updating and discussing the longshore sediment flux on this coast, (2) comparing the longshore drift spatial variability with measured shoreline evolution, (3) analyzing the interannual variability, in comparison with NAO indexes. Using a recent wave hindcast spanning the period 1958–2001, and the Kamphuis (1991) formula, the obtained gradients in longshore drift appear roughly consistent with the shoreline evolution and previous estimations of residual sediment fluxes. However, the estimated northward oriented fluxes are smaller in the present study than in the 33 year old reference study. The analysis shows a strong interannual variability, slightly smaller than the longshore variability. The interannual variability is not uniform along the coast. The northern section seems to be correlated with NAO indexes. Further analyses are required to better understand the temporal variability of the longshore sediment fluxes.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-brgm.archives-ouvertes.fr/hal-03652504
Contributeur : Frédérique Couffignal Connectez-vous pour contacter le contributeur
Soumis le : mardi 26 avril 2022 - 16:47:13
Dernière modification le : mercredi 27 avril 2022 - 03:37:06

Identifiants

Collections

Citation

Déborah Idier, Bruno Castelle, Elodie Charles, Cyril Mallet. Longshore sediment flux hindcast: spatio-temporal variability along the SW Atlantic coast of France. Journal of Coastal Research, Coastal Education and Research Foundation, 2013, 165, pp.1785-1790. ⟨10.2112/SI65-302.1⟩. ⟨hal-03652504⟩

Partager

Métriques

Consultations de la notice

4