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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, Elsevier Masson, 2015, 348 (6), in press. ⟨10.1016/j.crte.2015.01.001⟩. ⟨insu-01142371⟩

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