Abstract
Abstract. This paper presents an appraisal of the temporal evolution of flood vulnerability of two French cities, Besançon and Moissac, which were largely impacted by floods in January 1910 and March 1930, respectively. Both flood events figure among the most significant events recorded in France during the 20th century, in terms of certain parameters such as the intensity and severity of the flood and spatial extension of the damage. An analysis of historical sources allows the mapping of land use and occupation within the areas affected by the two floods, both in past and present contexts, providing an insight of the complexity of flood risk evolution at a local scale.
Highlights
Directive 2007/60/EC on the assessment and management of flood risks draws up a new framework for the promotion of historical information
Subsequent steps would involve drawing up flood risk maps by 2013 and establishing flood risk management plans focused on prevention, protection and preparedness by 2015
Boudou et al.: Assessing changes in urban flood vulnerability through mapping land use listing the elements at risk and, secondly, by evaluating the susceptibility of the elements at risk (Merz et al, 2007)
Summary
Directive 2007/60/EC on the assessment and management of flood risks draws up a new framework for the promotion of historical information. To mention just a few, these indicators include the number of inhabitants affected, the number of single-storey buildings, the number of employed persons, the number of nuclear power stations, and the area of remarkable built heritage Following this approach, flood risk assessment leads to a contrasted overview of the actual flood risk. Boudou et al.: Assessing changes in urban flood vulnerability through mapping land use listing the elements at risk and, secondly, by evaluating the susceptibility of the elements at risk (Merz et al, 2007) To carry out these two steps, we identify a series of indicators adapted for a retrospective analysis. It helps to shed light on the actual state of vulnerability within a territory This vulnerability (especially visible through the exposure of assets) should be seen as the result of a complex historical evolution, partly related to the occurrence of damaging flood events in the past (Barrera et al, 2006). Some key points are given (Sect. 5) concerning the importance of historical information for assessing vulnerability changes during the 20th century
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