Storm extreme levels and coastal flood hazards: A parametric approach on the French coast of Languedoc (district of Leucate) |
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| Authors: | Brice Anselme Paul Durand Yves-François Thomas Alexandre Nicolae-Lerma |
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| Institution: | aUMR 8586, PRODIG, université Paris 1, 2, rue Valette, 75005 Paris, France;bUMR 8591, laboratoire de géographie physique, université Paris 1, 1, place Aristide-Briand, 92195 Meudon, France |
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| Abstract: | Coastal flooding is a significant risk on the shores of Languedoc-Roussillon. The storms that periodically hit the coast can generate strong swells and storm surges. Most beach resorts, built on a low elevation dune ridge, are periodically flooded during major storms. Although risks zoning regulations take into consideration coastal flood hazards, the delineation of vulnerable areas is still insufficient and the commonly accepted threshold is regularly exceeded during most severe storms. This paper presents a method to improve the assessment of extreme storm-related water levels. It relies on fieldwork carried out in the Leucate commune (Aude), which is particularly exposed to the risk of sea level rise. It considers both storm surges and wave phenomena that occur within the surf zone (set-up and swash), calculated from the Simulating WAves Nearshore (SWAN®) numerical wave model and the Stockdon formula. Water levels reached during several recent storm events have been reconstructed and simulations of submerged areas were carried out by numerical modelling. |
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| Keywords: | Coastal flooding Storm extreme levels Numerical modelling Set-up Swash Leucate district France |
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