Mazas F.,SOGREAH Maritime |
Hamm L.,SOGREAH Maritime
Houille Blanche | Year: 2011
This paper presents a review of research works recently published in the literature related to the estimation of the 1-in-100-year extreme sea levels along French metropolitan coasts. Firstly, the different statistical methods used for these studies are summarized, with a clear distinction between the direct and indirect approaches combining storm surge and astronomical tidal levels. Secondly, available results are gathered and compared for the main three maritime frontages of France: North Sea/English Channel, Atlantic Ocean and Mediterranean Sea. Finally, two research topics are outlined for improving the current methodologies: namely the regional analysis approach and a special attention to data homogenization. © 2011 Société Hydrotechnique de France.
Hamm L.,SOGREAH Maritime |
Mazas F.,ParisTech National School of Bridges and Roads |
Garcia N.,SOGREAH Maritime |
Bailly B.,SOGREAH Maritime
European Journal of Environmental and Civil Engineering | Year: 2010
This article aims to improve the current statistical methods for the determination of extreme wave heights. It proposes both theoretically justified and user-friendly solutions and insists on the necessity for practitioners to build reliable wave databases. Use of the POT method is advocated and objective tools for threshold determination are presented. The choice of the statistical law is discussed; the GPD law is stressed and a multi-law approach is justified. The adjustment by the likelihood maximum estimator is strongly recommended. Tests were conducted on the site of Haltenbanken to illustrate the proposed improvements. Finally, a practical application in the Gibraltar straight is described in details. © 2010 Lavoisier, Paris.