Recent evolution of extreme sea surge-related meteorological conditions and assessment of coastal flooding risk on the gulf of Lions
This paper analyses sea surges measured at three tide gauge stations almost evenly located around the Gulf of Lions (from west to east, Port-Vendres, Sete and Grau-de-la-Dent) for the 1986-1995 period. Sea surges are spatially consistent at hourly and daily time scales. The barometric patterns assoc...
Wedi'i Gadw mewn:
| Cyhoeddwyd yn: | URI:https://journals.openedition.org/mediterranee, |
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| Prif Awduron: | , |
| Fformat: | Article ou chapitre numérique |
| Iaith: | Anglais |
| Cyhoeddwyd: |
Méditerranée
2009
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| Mynediad Ar-lein: | Accès Université d'Orléans et IFPM Accès Université d'Orléans et IFPM |
| Crynodeb: | This paper analyses sea surges measured at three tide gauge stations almost evenly located around the Gulf of Lions (from west to east, Port-Vendres, Sete and Grau-de-la-Dent) for the 1986-1995 period. Sea surges are spatially consistent at hourly and daily time scales. The barometric patterns associated with extreme sea surges are consistent for the three stations and show a stationary low pressure system near the Bay of Biscay associated with high pressure over central Europe from 48 hours before the maximum surge. The relationship between sea surges on the one hand and local-scale 3-hourly winds is analysed. Extreme sea surge ≥ 60 cm are mostly associated with regional-scale southerly winds over the NW Mediterranean Sea. These onshore winds drag the water towards the coast of the Gulf of Lions. Port-Vendres is also reactive to northerly winds due to the local orientation of the coast and location of the tide gauge. The frequency and length of southerly winds associated with regional-scale sea surges significantly increases everywhere from the middle of the 20th century. Sea surges ≥ 60h, active in erosion processes in the Gulf of Lions, occurs at least one hour per season and sea surge levels for return periods of 10 years are > 80 cm for positive extremes at each station. |
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