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Holocene formation and evolution of coastal dunes ridges, Brittany (France)

Abstract : Holocene coastal dune formation under a continuously rising sea level (SL) is an abnormal response to increasing storm frequency. The aim of this work is to understand the coastal sedimentary budget and the present-day sand starvation, controlled by climate and man. Dating in Brittany shows that Aeolian deposition initiated from ca. 4000 cal BP, with the slowing down of the SL rise. Pre-historical dunes appeared here from ca. 3000 cal BP, without SL regression. After, further building phases recycled the same stock of sands. Historical dunes I developed from ca. 350 AD. Major storms between 900 and 1200 AD resulted in the construction of washover coastal ridges, the Historical dunes II. A part of the sand was evacuated offshore. From ca. 1350 AD, the pre-existing ridges are reworked forming the Historical dunes III, leading to rapid coastal erosion and inland drift. Holocene dunes with a rising SL constitute a temporary anomaly, mostly forced by man, soon erased by storms in Brittany.
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Brigitte van Vliet-Lanoë, Jérôme Goslin, Alain Hénaff, Bernard Hallégouet, Christophe Delacourt, et al.. Holocene formation and evolution of coastal dunes ridges, Brittany (France). Comptes Rendus Géoscience, 2015, 348 (6), in press. ⟨10.1016/j.crte.2015.01.001⟩. ⟨insu-01142371⟩



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