In this paper, a composite boundary element method (Composite BEM) is formulated and applied to study the reflection coefficient of a submerged vertical plate-type breakwater, which is modeled as a thin or non-thickness structure. In the theory, two-dimensional motion with the wave crests parallel to the submerged breakwater and the linearized irrotational flow are assumed. The accuracy of the solution obtained using the numerical technique is demonstrated by comparing the numerical values with those obtained from experiments and with other analytical solutions. In addition, numerical results of wave reflection for both a submerged rectangular dike and a vertical plate-type breakwater are presented and discussed. -
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