La Jument lighthouse: a real-scale laboratory for the study of giant waves and their loading on marine structures

Type Article
Date 2019-10
Language English
Author(s) Filipot Jean-Francois1, Guimaraes P.2, Leckler Fabien2, Hortsmann J.3, Carrasco R.3, Leroy Elodie4, Fady N.4, Accensi MickaelORCID5, Prevosto MarcORCID5, Duarte Rui1, Roeber V.6, Benetazzo A.7, Raoult C.2, Franzetti M.8, Varing Audrey1, Le Dantec N.4
Affiliation(s) 1 : France Energies Marines, Plouzane, Bretagne, France.
2 : Serv Hydrog & Oceanograph Marine, Brest, Bretagne, France.
3 : Helmholtz Zentrum Geesthacht HZG Campus Teltow, Geesthacht, Germany.
4 : CEREMA Direct Terr Ouest, Plouzane, Bretagne, France.
5 : IFREMER, Plouzane, Bretagne, France.
6 : Univ Pau & Pays Adour, Bidart, France.
7 : CNR ISMAR, Venice, Italy.
8 : IUEM LGO, Plouzane, Bretagne, France.
Source Philosophical Transactions Of The Royal Society A-mathematical Physical And Engineering Sciences (1364-503X) (Royal Soc), 2019-10 , Vol. 377 , N. 2155 , P. 20190008 (21p.)
DOI 10.1098/rsta.2019.0008
WOS© Times Cited 12
Keyword(s) extreme wave, wave breaking, wave loading
Abstract

This paper presents results from an experiment designed to improve the understanding of the relationship between extreme breaking waves and their mechanical loading on heritage offshore lighthouses. The experiment, conducted at La Jument, an iconic French offshore lighthouse, featured several records of wave, current and structure accelerations acquired during severe storm conditions, with individual waves as high as 24 m. Data analysis focuses on a storm event marked by a strong peak in the horizontal accelerations measured inside La Jument. Thanks to stereo-video wave measurements synchronized to the acceleration record we were able to identify and describe the breaking wave responsible for this intense loading. Our observations suggest that this giant wave (19 m high) had a crest elevation high enough to directly hit the lighthouse tower, above the substructure. This paper reveals the potential for conducting ambitious field experiments from offshore lighthouses in order to collect valuable storm waves and wave loading observations. This offers a possible second service life for these heritage structures as in situ laboratories dedicated to the study of the coastal hydrodynamics and its interaction with marine structures. This article is part of the theme issue 'Environmental loading of heritage structures'.

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Filipot Jean-Francois, Guimaraes P., Leckler Fabien, Hortsmann J., Carrasco R., Leroy Elodie, Fady N., Accensi Mickael, Prevosto Marc, Duarte Rui, Roeber V., Benetazzo A., Raoult C., Franzetti M., Varing Audrey, Le Dantec N. (2019). La Jument lighthouse: a real-scale laboratory for the study of giant waves and their loading on marine structures. Philosophical Transactions Of The Royal Society A-mathematical Physical And Engineering Sciences, 377(2155), 20190008 (21p.). Publisher's official version : https://doi.org/10.1098/rsta.2019.0008 , Open Access version : https://archimer.ifremer.fr/doc/00513/62480/