High-resolution onshore-offshore morpho-bathymetric records of modern chalk and granitic shore platforms in NW France
Duperret, A.; Raimbault, C.; Le Gall, B.; Authemayou, C.; Van Vliet-Lanoë, B.; Regard, V.; Dromelet, E.; Vandycke, S. (2016). High-resolution onshore-offshore morpho-bathymetric records of modern chalk and granitic shore platforms in NW France. C. r. Géosci. 348(6): 422-431. https://dx.doi.org/10.1016/j.crte.2015.06.005
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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