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

Abstract : 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.
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Anne Duperret, Céline Raimbault, Bernard Le Gall, Christine Authemayou, Brigitte van Vliet-Lanoë, et al.. High-resolution onshore–offshore morpho-bathymetric records of modern chalk and granitic shore platforms in NW France. Comptes Rendus Géoscience, Elsevier Masson, 2016, 348, pp.422-431. ⟨10.1016/j.crte.2015.06.005⟩. ⟨insu-01185350⟩

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