Digues et polders littoraux : réflexions après la tempête Xynthia

Physio-Géo. Géographie physique et environnement

Verger, Fernand¹ 

关键词: inondation;    France;    Vendée;    Xynthia;    polders;    digues;    digues de mer;    schorres;    valeur foncière;    valeur écosystémique;    politique d'aménagement;    dikes;    sea dikes;    tidal marshes;    land value;    ecosystem value;    flood;    management policy;   

DOI  :  10.4000/physio-geo.1740

学科分类：自然科学（综合）

来源: Revues.org

【 摘 要 】

Polder dikes coasts include several categories: sea dikes, sleeper dikes and devastated levees. In Marais Poitevin, during the storm Xynthia, the entire network of dikes has been flooded due to the exceptional level of the sea at that time. This situation has raised awareness of the status network of the current network of levees and of the lack of a continuous line of sleeper levees at a sufficient level to limit the extent of the flooding.Solutions adopted elsewhere in Europe, such as processing of the polders in summer polders or depolderization have not been considered. The decision has been taken to repair at the same and to reinforce the previous defences. In a more general way, the elaboration of indexes has been done to improve the management of coastal polders. These indexes should reflect the ecosystem value of salt marshes whose biodiversity and productivity are outstanding. Although it may be difficult, the necessity to assess the different issues is necessary indeed because the rising of the sea level may force to maintain rigid coastline at a disproportionate investment in the long term.

【 授权许可】

Unknown