Abstract
Ile de Ré is a low-lying island located on the western edge of France. The extreme storm Xynthia (February 2010), was one of the most destructive natural disasters in this area, causing severe damages and breaches on coastal protections and one third of the total area of the island was flooded. Storm impact feedback showed that wave overtopping and/or overflow was responsible for more than 60 failures or breaches. From this major event, an important work was undertaken to improve the 100 km of coastal structures. This paper describes the development of a tool, partly based on numerical modelling, that will prioritise coastal structure monitoring by forecasting overtopping discharges and volumes on the different exposed dikes on Ile de Ré, regarding different storm parameters and structure characteristics. This tool will supply helpful information to manage the maintenance operations and improvements of this important linear of heterogeneous and sometimes old coastal protections.
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