Dynamiques morpho-sédimentaires des avant-plages et impact sur les stocks sableux : vers une meilleure stratégie de gestion des risques côtiers

Marie Jabbar 1, 2
1 LETG - Brest - Littoral, Environnement, Télédétection, Géomatique
LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
Abstract : The global phenomenon of coastal erosion, occurring especially on sandy coasts, tends to increase coastal risks in areas with key issues and concerns. In this context, stocks management strategies within sandy hydro-sedimentary coastal cells have appeared to be potential solutions to the local management of coastal erosion and their associated risks. However, despite their importance to determine management strategies, the dynamics of nearshore (submerged part of the cell) geomorphology remain poorly studied and partially understood. This PhD thesis aims to provide a better understanding of nearshore geomorphology in some specific sites and to contribute to the development of coastal risk management strategies.The study of multi-temporal bathymetric surveys at century-scale and annual-scale highlights significant evolution of the Brittany nearshore morphology from the beginning of the 20th century until today.In particular, a striking result is the reversal of the morphological evolution tendency in the mid-20th century. During the first half-century, the situation is steady, though nearshore morphology has a slight tendency toward accumulation. During the second half-century, we measured a net erosion tendency for all the survey sites. Interpretation and discussion of these results allow to determine the forcing of the nearshore morphodynamics, among which are climatic (coupled ocean-atmosphere) events, anthropogenic impacts and structural constraints.
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Marie Jabbar. Dynamiques morpho-sédimentaires des avant-plages et impact sur les stocks sableux : vers une meilleure stratégie de gestion des risques côtiers. Géographie. Université de Bretagne occidentale - Brest, 2016. Français. ⟨NNT : 2016BRES0108⟩. ⟨tel-01532463⟩

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