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Impact de brise-lames détachés poreux émergeants sur l'énergie de la houle à la côte

Abstract : Detached breakwaters are a classical solution for beach management and protection. When they are regularly disposed along the coast, they constitute barriers to wave propagation, and attenuate wave effects on the coast by reflection and diffraction between two successive structures, thanks to a suitable choice of the size of the structures and their spacing. The area sheltered by the breakwater is often filled with sand, forming a tombolo. Porous structures are increasingly considered, presenting from an environmental point of view the advantages of promoting the development of biodiversity and maintaining a circulation of water masses for better water quality. The work presented here is dedicated to the study of a porous breakwater, consisting of a dense array of emergent vertical cylinders. Experiments about hydrodynamic were carried out in 3D in the SeaTech test basin, and compared to numerical models based on integral formulations of velocity potentials. The symmetry associated with the basin width allows to consider the study case as that of a set of regularly spaced breakwaters along the coast. Due to the porosity of the breakwater, part of the waves continues to propagate with dissipation through the structure, changing significantly the agitation conditions downwave the structure. The wave energy is more homogeneous along the coast, the diffraction, less important, being compensated by a flow through the structure. For particular wave conditions, interference may occur not only depending on the distance between two successive breakwaters, as for conventional impervious structures, but also on the porous structure, increasing the dissipation wave energy.
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G. Arnaud, Vincent Rey, Julien Touboul, Damien Sous. Impact de brise-lames détachés poreux émergeants sur l'énergie de la houle à la côte. Digues 2019, Mar 2019, Aix-en-Provence, France. ⟨10.5281/zenodo.2348986⟩. ⟨hal-02082184⟩

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