Approche multidisciplinaire pour la caractérisation d’inondations remarquables : enseignements tirés de neuf évènements en France (1910-2010)

Abstract : The occurrence of a 100 year flood in the Paris area like the January 1910 flood event is a major issue of concern as its potential economic impacts are today estimated around 30 billion euros. This shows the interest of studying exceptional past flood events for flood risk management. It has recently been confirmed by the European Flood Directive 2007/60/CE, in which article 4 recommends describing the floods that had “significant adverse impacts”. This aspect raises some questions. What does significant adverse impact mean? What is the interest to describe those events? This PhD thesis is focussing on a multidisciplinary approach for characterizing remarkable flood events, term used to qualify the 176 flood events selected during the Preliminary Risk Assessment of 2011 into the French National Historical Flood database (BDHI).An evaluation grid, based on the hydrometeorological aspects of the flood hazard as well as the socio-economic and politic consequences of the flood event, was applied to the set of 176 floods. The results conducted to select 9 remarkable flood events from 1910 to 2010. Monograph studies are presented on each of these case studies and are used to deal with three questions on the interest of studying past flood events: 1/ what are the factors involved in the hazard process leading to a remarkable flood event? ; 2/ does a retrospective analysis helps to understand the main explicative factors of flood mortality? ; 3/ how does the society manage a remarkable flood event?The analysis is especially supplied by the use of mapping which offers some issues to better understanding the different spatio-temporal dynamics and the main factors involved in a remarkable flood event.
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Martin Boudou. Approche multidisciplinaire pour la caractérisation d’inondations remarquables : enseignements tirés de neuf évènements en France (1910-2010). Géographie. Université Paul Valéry - Montpellier III, 2015. Français. ⟨NNT : 2015MON30057⟩. ⟨tel-01305937⟩

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