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

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• 作者：Anne Duperret^a ; ^b ; ^{anne.duperret@univ-lehavre.fr" class="auth_mail" title="E-mail the corresponding author} ; Cé ; line Raimbault^a ; Bernard Le Gall^b ; Christine Authemayou^b ; Brigitte van Vliet-Lanoë ; ^b ; Vincent Regard^c ; Elsa Dromelet^d ; Sara Vandycke^e
• 关键词：Rocky coast ; Shore platform ; Shoreline ; Land-sea DEM ; Holocene ; Bathymetry ; Tectonics
• 刊名：Comptes Rendus Geoscience
• 出版年：2016
• 出版时间：July-August 2016
• 年：2016
• 卷：348
• 期：6
• 页码：422-431
• 全文大小：4476 K

文摘

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.