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Cartographie et analyse économique de la vulnérabilité du littoral atlantique français face au risque de submersion marine

Axel Creach 1
1 LETG - Nantes - Littoral, Environnement, Télédétection, Géomatique
CNRS - Centre National de la Recherche Scientifique : UMR6554, EPHE - École pratique des hautes études, UNICAEN - Université de Caen Normandie, UBO - Université de Brest, UR2 - Université de Rennes 2, IGARUN - Institut de Géographie et d'Aménagement Régional de l'Université de Nantes
Abstract : Xynthia (2010) led to an important coastal flood which was responsible for the death by drowning of 41 people. Reviews of the storm show that the consequences of Xynthia were the result of: the aging population of coastal towns, urbanisation of low-lying areas, and architectural inadequacy of houses to coastal flood risk. In consequence, French State Faced implements a resettlement scheme, destroying 1628 buildings considered too dangerous (black zones). The aim of the thesis is (i) to identify danger areas for the population through characteristics of houses, and (ii) to make an economic appraisal of different measures to reduce vulnerability. An index is created to identify areas where the characteristics of houses can present a life-threatening exposure to occupants. Vulnérabilité Intrinsèque Extrême index (VIE) is based on four criteria: (i) potential water depth per house, (ii) distance between dikes and houses, (ii) architectural typology and (iv) the closeness to rescue point. The index is useful to make an initial assessment of the vulnerability of seven cities on French Atlantic coast. It allows confirming the high exposure of Xynthia’s affected territories. Then, an economic appraisal is conducted to compare different strategies to reduce vulnerability: (i) protection, (ii) adaptation of houses, (iii) prevention and warning, (iv) resettlement. Through the use of Cost-Efficiency Analysis (CEA), the relevance of each of the measures is evaluated through the number of human lives protected. This analysis is a good assessment of the efficiency of “black zones” as well it recommends focusing on prevention and warning measures.
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Submitted on : Friday, February 19, 2016 - 11:53:38 AM
Last modification on : Wednesday, November 17, 2021 - 12:30:27 PM

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  • HAL Id : tel-01275600, version 1

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Axel Creach. Cartographie et analyse économique de la vulnérabilité du littoral atlantique français face au risque de submersion marine. Géographie. Université de Nantes, 2015. Français. ⟨tel-01275600⟩

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