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Le recul des falaises de craie de Normandie à l’échelle du Quaternaire, par approche terre-mer

Abstract : The chalky cliff coastline of Normandy is characterized by a vertical cliff at the foot of which develops an intertidal coastal platform, which is subject to strong erosion, illustrated by the rapid retreat of its cliffs. This thesis deals with the qualification of the '' short-term (annual) and long-term (multi-millennium) erosion of the Normandy chalk cliffs by the use of various methodologies: 1) A first quantitative approach by photogrammetry was carried out on the Senneville-sur Fécamp cliff with the aim of quantify the erosion of the cliff face over a period of one and a half years, and identify the main factors responsible for this erosion. 2) The acquisition of bathymetric data in coastal areas has made it possible to identify specific morphologies of rocky platforms underwater, indicative of the past erosive dynamics of the cliffs. 3) A morphometric analysis by numerical method of worm basins sants de Seine-Maritime was built on the hanging valleys of the chalky coast. It made it possible to locate the cliff paleo-position on the eroded platform by projection of the slope profile. Thus, long-term recoil speeds of the coast have been extended to the whole of the Seine-Maritime coast. 4) Cosmogenic dating using the 10Be isotope was carried out on flint relics of the stripped platform made it possible to validate the rates erosion determined over the period of several millennia.
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Submitted on : Tuesday, February 25, 2020 - 11:10:11 AM
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  • HAL Id : tel-02490264, version 2


Timothée Duguet. Le recul des falaises de craie de Normandie à l’échelle du Quaternaire, par approche terre-mer. Sciences de la Terre. Normandie Université, 2019. Français. ⟨NNT : 2019NORMLH29⟩. ⟨tel-02490264v2⟩



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