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The interaction of obliquely incident surface gravity waves with a verticalflexible permeable membrane wave barrier is investigated in the context ofthree-dimensional linear wave-structure interaction theory. A generalformulation for wave interaction with permeable submerged vertical membrane isgiven. The analytic solution of the physical problem is obtained by usingeigenfunction expansion method, and boundary element method has been used toget the numerical solution. In the boundary element method, since the boundarycondition on the membrane is not known in advance, membrane motions andvelocity potentials are solved simultaneously. From the general formulation ofthe submerged membrane barrier, the performance of bottom-standing,surface-piercing and fully extended membrane wave barriers are analyzed forvarious wave and structural parameters. It is found that the efficiency of thesubmerged, surface-piercing and bottom-standing membrane wave barriers can beenhanced in waves for certain design conditions. From the analysis of variousmembrane configurations and parameters, it can be concluded that permeablemembrane wave barrier can function as a very effective breakwater if it isproperly designed.

Scattering of oblique waves by permeable vertical flexible membrane wave barriers