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Évolution morphologique actuelle d'une flèche littorale holocène : le Cap Ferret, à l'embouchure du Bassin d'Arcachon

Abstract : Low rates of global sea level rise have allowed the Cap Ferret coastal barrier-spit to develop since about 3 000 years ago. Over the last 250 years, navigation charts attest of a significant instability of the distal end of the spit, to which the present study aims to provide a physical explanation. First, the crossing of cartographic data with meteoceanic data reveals a strong relationship of the spit-end behaviour with, on the one hand, the North Atlantic Oscillation (NAO), and, on the other hand, decadal to multidecadal variations in the rate of sea level rise in the Northeast Atlantic. Underlying processes were then investigated using a numerical model for sediment transport. Finally, the chronic erosion of the spit between 1986 and 2016, as well as the evolution mechanisms of the oceanic beach of the spit-end are described and quantified by means of topographic data. Locally, these results support the role of climate in the ongoing erosion of the spit-end. From a wider perspective, this study brings new insigths on the processes controling the evolution of Holocene barrier systems, in the present context of an accelerating sea level rise.
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Submitted on : Tuesday, November 27, 2018 - 1:12:11 PM
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Alphonse Nahon. Évolution morphologique actuelle d'une flèche littorale holocène : le Cap Ferret, à l'embouchure du Bassin d'Arcachon. Sciences de la Terre. Université de Bordeaux, 2018. Français. ⟨NNT : 2018BORD0182⟩. ⟨tel-01936327⟩

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