Submerged dual buoy/porous-membrane breakwaters
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This paper outlines the numerical and experimental investigation of wave interactions with fully submerged and floating dual buoy/vertical membrane breakwaters. To assess the efficiency of this dual system with non-porous or porous membranes, two-dimensional multi-domain hydro-elastic formulation was carried out in the context of linear wave-body interaction theory and Darcy's law. The developed theory is validated through 2-D wave tank experiments for several limited cases. It is found that transmission and reflection characteristics are sensitive to design parameters of breakwater system; size of buoy, membrane tension and spacing, submergence depth, gaps between seafloor and end of membranes, and mooring type and stiffness. These parameters offer the opportunity to tune the breakwater system, for archiving mutual cancellation to the coming waves, and to reflect incident waves over a wide range of wave frequency. The energy dissipations through fine pores on membranes attenuate the transmitted and reflected waves simultaneously, and reduce dramatically the displacement of buoy and membranes at resonance frequencies. Copyright 2004 by The International Society of Offshore and Polar Engineers.
