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High-resolution onshore–offshore morpho-bathymetric records of modern chalk and granitic shore platforms in NW France

par Duperret, Anne;Raimbault, Céline;Le Gall, Bernard;Authemayou, Christine;van Vliet-Lanoë, Brigitte;Regard, Vincent;Dromelet, Elsa;Vandycke, Sara
Référence Comptes rendus. Géoscience, 348, 6, page (422-431)
Publication Publié, 2016-07

Article révisé par les pairs

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Résumé :

Modern shore platforms developed on rocky coasts are key areas for understanding coastal erosion processes during the Holocene. This contribution offers a detailed picture of two contrasted shore-platform systems, based on new high-resolution shallow-water bathymetry, further coupled with aerial LiDAR topography. Merged land-sea digital elevation models were achieved on two distinct types of rocky coasts along the eastern English Channel in France (Picardy and Upper-Normandy: PUN) and in a NE Atlantic area (SW Brittany: SWB) in NW France. About the PUN case, submarine steps, identified as paleo-shorelines, parallel the actual coastline. Coastal erosive processes appear to be continuous and regular through time, since mid-Holocene at least. In SWB, there is a discrepancy between contemporary coastline orientation and a continuous step extending from inland to offshore, identified as a paleo-shoreline. This illustrates a polyphased and inherited shore platform edification, mainly controlled by tectonic processes.