On The Impact of a Series of Severe Storms on a Double-Barred Sandy Coast: Dune Erosion and Megacups Embayments

Bruno Castelle 1 Vincent Marieu 1 Stephane Bujan 1 Kristen D. Splinter 2 Arthur Robinet 3, 1 Nadia Senechal 1 Sophie Ferreira 4
1 EPOC - Environnements et Paléoenvironnements OCéaniques
2 WRL - Water Research Laboratory
3 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
4 OASU - Observatoire aquitain des sciences de l'univers
Abstract : The winter of 2013/2014 was outstanding in terms of the available energy to move sediment and caused large-scale unprecedented erosion of the Gironde coast (France), comprising the onset of megacusp embayments cutting the dune with a typical alongshore and cross-shore lengthscale of O (100 m) and O(10 m), and a dune erosion scarp height often exceeding 10 m. Megacusps are found to be coupled to the outer crescentic sandbar and triggered by the outstandingly high-energy, long-period and normally-incident storm wave event Hercules on January 6-7. Our observations indicate that both the antecedent outer sandbar morphology and storm wave characteristics, including period and angle of incidence, govern patterns of beach and dune erosion along open multiple-barred sandy coasts during severe storms.
Type de document :
Communication dans un congrès
Coastal Sediments 2015, May 2015, San Diego, United States
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https://hal-brgm.archives-ouvertes.fr/hal-01147629
Contributeur : Arthur Robinet <>
Soumis le : jeudi 30 avril 2015 - 17:07:16
Dernière modification le : lundi 15 janvier 2018 - 12:20:02

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  • HAL Id : hal-01147629, version 1

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Bruno Castelle, Vincent Marieu, Stephane Bujan, Kristen D. Splinter, Arthur Robinet, et al.. On The Impact of a Series of Severe Storms on a Double-Barred Sandy Coast: Dune Erosion and Megacups Embayments. Coastal Sediments 2015, May 2015, San Diego, United States. 〈hal-01147629〉

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