Upper beach reconstruction patternsafter moderate storm events

Abstract : The wave-dominated beach barrier of Villeneuve-Lès-Maguelone extends between Palavas and Frontignan (Gul f of Lions, northernmost Me diterranean Sea), along a slightly natural sandy protected area char acterized by typical and well-expressed morphologies. In the nearshore, the sea bottom shows one or two approximately rectilinear sand bars. In 2010-2011, we pe rformed a 6 month-long monitoring (autumn 2010/late spring 2011) of a 500 meter-long se gment along this sand barrier. We used RTK D-GPS offering centimeter resolution to acquire sets of elevation data on the beach and the upper shoreface. The study is innovative because a full morphologic monitoring was performed each time the wave/ wind conditions changed significantly. These changes were tracked in real-time thanks to a set of hydrodynamic equipments deployed at sea, including well-known DREAL buoys. We identify from well- documented data: (1) a beach reconstruction cycle at the shorelin e after a moderate storm event (wave height at 3-4 m) and (2) how a sand bar in the nearshore migrates to the shoreline and drives the shoreline shift.
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Lucie Campmas, Frederic Bouchette, Jying Li Liou, Elena Brambilla, Samuel Meulé, et al.. Upper beach reconstruction patternsafter moderate storm events. Revue Paralia, Editions Paralia CFL, 2012, XII emes Journées Nationales Génie Cotier - Génie (Cherbourg, 12-14 juin 2012), pp.233-240. ⟨10.5150/jngcgc.2012.023-C⟩. ⟨hal-00854402⟩



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