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Unprecedented experimentation at the lighthouse of the Jument


Launch of the 3rd winter measurement campaign

A collaborative R&D project

At the moment, the third measurement campaign is taking place at the lighthouse of the Jument, as part of the DIME collaborative R&D project. This project aimed at improving knowledge of sea states in the event of storms in order to optimize the design of renewable energy recovery systems such as floating wind turbines. Indeed, such machines are exposed to extreme waves can endanger their mechanical structure. If these extreme waves are brought to break, the danger for the machines is even greater. It is therefore essential to better understand and characterize these phenomena.

An experimental system on a scale of 1:1

DIME, includes a groundbreaking operation that began in December 2017 near the Ile d'Ouessant, with the support of Cerema, Ifremer, Shom and Helmholtz-Zentrum Geesthacht (HZG), a German materials and coastal research centre. The principle? Using the lighthouse of the Jument as an experimental device on a scale of 1:1 and studying the waves of an area representative of the future locations of floating wind farms (water depth between 50 and 80 m). Two current profilers and three wave buoys located nearby provide in situ information on the waves and surrounding currents. State-of-the-art equipment has also been installed at the top of the lighthouse: a camera system allows the waves to be reconstructed in three dimensions, and a radar is used to map the wave field on a larger scale. Accelerometers quantify the building's movements under the influence of waves.  Three pressure sensors have been installed on the front of the lighthouse to determine wave forces. For the first time, 3D strain measurement systems developed by Morphosense are also used.

Winter campaigns

After two campaigns conducted during winters of 2017 and 2018, a new one is taking place at the moment. This will be repeated over the next winter. After exploitation and analysis, the latter will improve the predictability of extreme and breaking waves, an essential element for optimising renewable energy recovery systems and thus their cost competitiveness. The knowledge gained will also be very useful in the current context of intensifying storms and exposing populations to the risk of increased marine flooding. The Mare's lighthouse will not be forgotten because the data will be used to refine the estimate of its lifespan and to recommend consolidation measures to extend it.

Partners with complementary contributions

The DIME project is funded by France Energies Marines and the State managed by the Agence Nationale de la Recherche under the programme Investissements d'Avenir (ANR-10-IEED-0006-14). The experiment on the lighthouse of the Jument was also supported by the Filière Mer of the Crédit agricole. Coordinated and scientifically managed by France Energies Marines, the project brings together a consortium of 17 academic and private partners with complementary skills and contributions, guaranteeing quality scientific work.