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UNESCO-IHE Institute for Water Education, Delft (2010)

Urban development, climate change and flood risk management : a case study of Saint-Louis, Senegal

Seck, A

Titre : Urban development, climate change and flood risk management : a case study of Saint-Louis, Senegal

Auteur : Seck, A

Etablissement de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2010

Urban floods cannot be managed in isolation at the city scale and responses to potential flood impacts are complicated by interlinked political, socio-economic and environmental changes state (Zevenbergen et al 2008). The city of Saint-Louis in Senegal, situated at the confines of the Senegalese river mouth, between the Atlantic Ocean and the low estuary zone of a 1750 km long drained river, has already experienced many dramatic floods along its history. Many low lying areas determine the geo-physical aspects of the city. Very rapid population growth, uncontrolled urban expansion, very weak flood defense development and lack of implementing a coherent flood governance system etc. makes it for authorities and decision makers difficult to ensure a save environment to flood related issues. Many efforts are being made to control the actual situation. Since 1999, the local scientist community and local authorities are trying to make good progress in addressing the existing flood threats in the area. However, the added effects of climate change variability (sea level rise) and socio-economic changes will certainly call more serious problems. This research tries to investigate the question of climate variability impacts on floods in Saint-Louis by using scenarios based to map the flood extension and thus to identify area and populations which are touched or which are in danger. GIS seems to be a powerful tool for combining important information (DTM, DEM & water level) for a better comprehension of the floods and the characterization of surface qualities in the city and to get an understanding of future threatened areas of the urban extension trend, by climate changes variability. This research reflects an idea that contributes in a project cooperation between Dordrecht (the Netherlands) and Saint-Louis. The establishment of this project provided a beginning of coordinated approach to urban flood management strategy. It also adds value to the constitution of a tool of decision-making aid and makes it possible to have information relating to the limits reached by the flood, the magnitudes of flooded surfaces and to detect the more exposed zones in order to establish a hierarchical map according to the percentage of exposure to the risks of future climate change.

Sujets  : urban development ; flood risk management ; climate change ; Senegal ; case studies


Page publiée le 2 janvier 2017, mise à jour le 18 octobre 2018