气候变化领域集成服务门户(CCPortal): The depositional record of the French Flemish Coastal plain since antiquity: Impacts of land reclamation in a tide-dominated estuary

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DOI	10.1002/dep2.279
	The depositional record of the French Flemish Coastal plain since antiquity: Impacts of land reclamation in a tide-dominated estuary
	Ouchaou, Rachid; Reynaud, Jean-Yves; Besse, Youn; Tilehghouatine, Anissa; du Chatelet, Eric Armynot; Trentesaux, Alain; Abraham, Romain; Deschodt, Laurent; Hulin, Guillaume; Desoutter, Samuel; Fores, Benjamin; Simon, Francois-Xavier; Lancon, Mathieu
发表日期	2024
EISSN	2055-4877
英文摘要	The French Flemish Coastal Plain, which extends from Denmark to France, is characterised by a topography close to sea level and protected by a system of coastal dunes. Quaternary sediments, comprised of marine, estuarine and continental deposits, accumulated by infilling and then prograding above a network of incised valleys. This study focusses on the Holocene infill of the Denna palaeoestuary, south-west to Dunkerque. Surface geophysics (electrical conductivity and ground-penetrating radar) and vibrocore data are used to reconstruct the landscape evolution during the last stages of sedimentation. The conductivity map highlights the last network of tidal channels, ditches and dikes of the eastern side of the palaeoestuary. Over the upper 4 m of the infill, the ground-penetrating radar profiles show two superimposed units. The bottom unit is composed of meandering channel bars and the top unit of flat strata intersected by sparse channels, mostly infilled in place. The sediment analysis of the vibrocores shows a predominantly sandy filling of marine to estuarine origin, evidenced by sponge spicules and a fauna of bivalves and foraminifera adapted to brackish settings. The uppermost deposit exhibits an oxidation profile which marks the groundwater zone transition. Clayey sediments are also present, infilling the uppermost channels and ditches dug during reclamation, in increasing proportions towards the axis of the estuarine palaeovalley. The tidal signature of sedimentary dynamics is evidenced by heterolithic facies in some channel fills and tidal rhythmites infilling scour depressions linked to dike breaching. The abrupt decrease in channel dynamics across the unit boundary, although sedimentation remained sandy in the upper unit, coincides with the development of embankment of the estuarine border and is tentatively interpreted as a result of reclamation. The French part of the Flemish coastal plain, Southern North Sea, has estuaries that vanished in the Middle Age through progressive embankment. Surface geophysics and cores show increased sand/mud partitioning during land reclamation, with channels becoming mud-filled while emerging flats remained sandy. This could be the result of ingression of sheet flows in the polders caused by catastrophic floods breaching the dikes.image
英文关键词	dike breaching; Flemish plain; France; geoarchaeology; ground-penetrating radar; Holocene; North Sea; reclamation; tidal rhythmites; vibrocores
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:001190395500001
来源期刊	DEPOSITIONAL RECORD
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305500
作者单位	Centre National de la Recherche Scientifique (CNRS); Universite du Littoral-Cote-d'Opale; Institut de Recherche pour le Developpement (IRD); Universite de Lille; Universite Paris-Est-Creteil-Val-de-Marne (UPEC); Centre National de la Recherche Scientifique (CNRS); CNRS - Institute of Ecology & Environment (INEE); Sorbonne Universite; Universite de Lille; Universite de Franche-Comte; Centre National de la Recherche Scientifique (CNRS)
推荐引用方式 GB/T 7714	Ouchaou, Rachid,Reynaud, Jean-Yves,Besse, Youn,et al. The depositional record of the French Flemish Coastal plain since antiquity: Impacts of land reclamation in a tide-dominated estuary[J],2024.
APA	Ouchaou, Rachid.,Reynaud, Jean-Yves.,Besse, Youn.,Tilehghouatine, Anissa.,du Chatelet, Eric Armynot.,...&Lancon, Mathieu.(2024).The depositional record of the French Flemish Coastal plain since antiquity: Impacts of land reclamation in a tide-dominated estuary.DEPOSITIONAL RECORD.
MLA	Ouchaou, Rachid,et al."The depositional record of the French Flemish Coastal plain since antiquity: Impacts of land reclamation in a tide-dominated estuary".DEPOSITIONAL RECORD (2024).