Vers la caractérisation des phénomènes météo-marins responsables des inondations par la mer des côtes basses en Manche orientale

Pauline Letortu 1 Stéphane Costa 1 Olivier Cantat 1 Olivier Planchon 2
1 LETG - Caen - Littoral, Environnement, Télédétection, Géomatique
LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
2 LETG - Rennes - Littoral, Environnement, Télédétection, Géomatique
LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
Abstract : Coastal flooding due to storm is the result of a combination of factors: a low air pressure, a strong wind with a direction perpendicular to the coast at the time of spring high tide (the average coefficient of spring tide is about 95). Characterization of coastal floods leading to damages has received attention and many studies have been carried out along the coast of the eastern English Channel. Thanks to our inventory of coastal flooding events from 1949 to 2010, the identification of the meteorological parameters such as the north-west pressure gradient or the passage of an atmospheric cold front during the storm has been possible. This identification leads to a better warning of numerous coastal flooding events. However, some of them cannot be explained by these parameters. To understand them, it is necessary to integrate another factor: the meteorological and marine conditions before coastal flooding. For a few days or weeks before a coastal flooding event, the beach can adapt to stronger hydro-dynamic conditions. This adaptation can be a lowering of the beach profile. Lowering can lead to flood and damages. The aim of the study is to improve prediction/warning of these events that can end in major damages on these coastal areas.
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https://hal.archives-ouvertes.fr/hal-00709672
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Submitted on : Tuesday, June 19, 2012 - 11:10:09 AM
Last modification on : Tuesday, August 27, 2019 - 11:02:09 AM

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Pauline Letortu, Stéphane Costa, Olivier Cantat, Olivier Planchon. Vers la caractérisation des phénomènes météo-marins responsables des inondations par la mer des côtes basses en Manche orientale. Congrès de la SHF (Société Hydrotechnique de France) : événements extrêmes fluviaux et maritimes, Feb 2012, Paris, France. 8 p. ⟨hal-00709672⟩

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