MODELING MACRO ROUGHNESS WITH A POROUS MEDIA, EXAMPLE OF THE ARTHA BREAKWATER

Regarding the wave climate and urbanisation in bask country, several coastal structure that area are submitted to extreme conditions can be destructive. While transformation over low mild sloping beaches have been widely studied, shoaling, breaking, reflection dissipation steep very rough slopes much less documented, Van der Meer (1992) Dodet et al. (2018). With slightly different values some coral reef present similar roughness object of insitu numerical studies Buckley(2015), Sous (2020). During fall 2018 a measurement campaign was conducted close Artha breakwater. Offshore spectral parameters were measured at directional buoy 20 m water depth. A currentmeter installed foot block armor unit 15m deep while five pressure sensors attached directly on concrete blocks obtain complete cross-shore survey armor. In addition, high frequency impact measurements carried out dike wall together with punctual video recordings impacts. The whole setup therefore provides unique comprehensive in-situ dataset