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Croissance urbaine et risque inondation en Bretagne

Janique Valy 1 
1 LETG - Rennes - Littoral, Environnement, Télédétection, Géomatique
LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
Abstract : The end of the XX° century is characterised by an increase of the long standing phenomena consisting of settling down and building sites on plains liable to inundation. Flooded french plains do not except this evolution, in spite of the establishment of administrative regulations. For the last twenty years, Brittany has experienced several hydroclimatic events which have impacted numerous urban areas, especially Rennes outlying urban districts as well as the Vilaine catchment and coastal fringe urban centres. These successive hydroclimatic events have lead to the emergence of scientific discussions about the risk of flooding over a regional scale. They have contributed to put forward the vulnerability of some urban areas, hence questioning regional planning logics, especially in the areas close to highly developping urban centres. These phd researches focus on the study, on different scale, of these urban extensions. They are characterised by their initial degree of vulnerability and assessed in regards to both french administration regulations and climatic constraints. Areas under study include Quimper and some districts belonging to Rennes urban centre. The method developped is based on two main steps. First, the flooded areas limits are defined and secondly, urban districts developments are assessed. Urban districts developments analyses rely upon an historical approach taking into account the settling and evolution of former city centres as well as on a recent analysis of urban extension prevailing during the XX° and XXI° centuries. This approach permits to determine the spatial trajectories of districts land uses especially in flooded plains. The analysis permits to put forward the main logics which control the urban development as well as ascertain the increase of flooding risk. It aims at both accurately comprend stakes resulting from urban development and at increase the understanding of the stakeholders attitudes (especially local elected) when facing a flood event. Flood events taken into consideration can be former as well as current ones. Main results put forward that risk adaptation strategies often rely on an a minima risk consideration: It is poorly considered when management projects are elaborated or applied
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Submitted on : Monday, September 19, 2011 - 1:20:55 PM
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  • HAL Id : tel-00624646, version 1

Citation

Janique Valy. Croissance urbaine et risque inondation en Bretagne. Géographie. Université Rennes 2; Université Européenne de Bretagne, 2010. Français. ⟨NNT : 2010REN20021⟩. ⟨tel-00624646⟩

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