ROBIN, Nicolas; BILLY, Julie; CASTELLE, Bruno; HESP, Patrick; LAPORTE FAURET, Quentin; LERMA, Alexandre Nicolae; MARIEU, Vincent; ROSEBERY, David; BUJAN, Stephane; DESTRIBATS, Benoit; MICHALET, Richard

doi:10.2112/SI95-115.1

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Licence d’utilisation du document

ROBIN, Nicolas
Adaptation, Climat Tropical, Exercice et Santé [URp5_4] [ACTES]
Centre de Formation et de Recherche sur les Environnements Méditérranéens [CEFREM]

BILLY, Julie
Bureau de Recherches Géologiques et Minières [BRGM]

CASTELLE, Bruno

Environnements et Paléoenvironnements OCéaniques [EPOC]

Langue

Article de revue

Ce document a été publié dans

Journal of Coastal Research. 2020-05-01, vol. 95, n° sp1, p. 588

Résumé en anglais

Foredunes are efficient natural coastal defenses acting as protective barriers during storm events. A striking example is the response of coastal dunes along the Aquitaine Coast (SW France) to the 2013-2014 winter, which was the most energetic winter since at least the mid-20th century in most of the NE Atlantic. The aim of this study is to analyze the (partial) foredune recovery from the 2013-2014 winter at Truc Vert beach using ground-penetrating radar (GPR) and through the coastal dune internal structure. Geophysical data was compared with semi-monthly DGPS topographic data of the beach, UAV-photogrammetry and Airborne LiDAR surveys of the coastal dune. Three main recovery phases were identified from the 2013-2014 winter: (i) aggradation of the upper-beach and dune front-crest during the post-storm summer; (ii) distinct phases of incipient dune-foot development with dune-crest stability during the following year, and (iii) since 2016, aggradation of both dune-foot and dune front-crest tending towards an equilibrium profile. This study shows that GPR surveys, combined with chronological topographic data, is an efficient tool to provide comprehensive understanding of the beach-dune system evolution at a decadal scale. This approach opens new perspectives to document foredune recovery timing and magnitude along sandy coasts.< Réduire

Mots clés en anglais

natural coastal defenses

beach-dune interaction

foredune

GPR

Post-storm recovery

LiDAR

URI

https://oskar-bordeaux.fr/handle/20.500.12278/189162

DOI

http://dx.doi.org/10.2112/SI95-115.1

Project ANR

Marier les objectifs de défense côtière avec ceux de la protection du milieu naturel grâce aux dunes sableuses - ANR-17-CE01-0014

Unités de recherche

EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805