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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Coastal flooding and dune breaching in the central part of the bay of biscay
Coastal flooding and dune breaching in the central part of the bay of biscay
Author : XAVIER BERTIN (1) & GAEL ARNAUD(1)
ABSTRACT
The central part of the Bay of Biscay is exposed to extra-tropical storms that can induce large surges, rough sea states
and significant damages and human losses. This study presents a synthesis of results obtained in our Lab over the last 5
years in the scope of several research projects fostered by Xynthia, a mid-latitude storm that severely hit this area in
February 2010. The large surge induced by Xynthia was explained by a particular sea-state that strongly increased the
ocean roughness and the surface stress. This particular sea state was explained by the unusual track of Xynthia from SW
to NE, which restricted the fetch to a few hundred km only. The flooding associated with Xynthia was accurately hindcast
and the analysis of modeling results revealed that massive flooding could limit water levels in estuaries. This phenomenon
was shown to have major implications for engineering practices and coastal defense strategies. The combination of
historical archives and simplified numerical simulations revealed that 6 flooding similar to that induced by Xynthia occurred
over the last century, which highlight the relevance of historical data and questions the available estimations for the return
periods of extreme sea levels. Finally, the winter 2013-2014 was characterized by an exceptionally energetic wave climate
in the Bay of Biscay that caused severe erosion along the coast and the local development of overwash. Field
measurements were performed at La Faute-sur-Mer during one of these events and are being combined with numerical
modeling to better understand the mechanisms controlling overwash development.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 18/08/2015
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