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

Type Article
Date 2016-07
Language English
Author(s) Van Vliet-Lanoe Brigitte1, Goslin JeromeORCID2, Henaff Alain2, Hallegouet Bernard2, Delacourt Christophe1, Le Cornec Erwan3, Meurisse-Fort Murielle4
Affiliation(s) 1 : Brest Univ, CNRS Domaines Ocean, UMR 6538, IUEM, Rue Dumont Urville, F-29280 Plouzane, France.
2 : Brest Univ, UMR 6554, CNRS LETG Geomer IUEM, Rue Dumont Urville, F-29280 Plouzane, France.
3 : GEOS AEL, 12 Rue Marechal Foch, F-56410 Etel, France.
4 : Conseil Gen Pas de Calais, Serv Dept Archeol, 7 Rue 19 Mars 1962, F-62000 Dainvillefd, France.
Meeting 14th Congress of the French-Association-of-Sedimentologists, Paris, FRANCE, NOV 05-07, 2013
Source Comptes Rendus Geoscience (1631-0713) (Elsevier France-editions Scientifiques Medicales Elsevier), 2016-07 , Vol. 348 , N. 6 , P. 462-470
DOI 10.1016/j.crte.2015.01.001
WOS© Times Cited 13
Keyword(s) Dunes, Holocene, Climate, Sand starvation, Anthropic perturbation
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. (C) 2015 Academie des sciences. Published by Elsevier Masson SAS.

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