Dual boundary element model coupled with the dual reciprocity method to determine wave scattering by a concentric cylindrical system mounted on a conical shoal

In this study, the dual boundary element method (DBEM) is coupled with the dual reciprocity method (DRM) to investigate wave scattering by a concentric porous cylinder system, which consists of a circular inner cylinder and semicircular porous outer cylinder mounted on a conical shoal. The complex porous-effect parameter proposed by Yu and Chwang [2] is used to describe the permeability of the porous outer cylinder. The effect of topography has been considered by applying the extended mild-slope equation (EMSE) which was proposed by Chandrasekera and Cheung [10] to the entire fluid domain. The wave force, wave amplification, and increased performance configuration are illustrated through examples.