中文摘要：

采用典型的海工结构物——大直径垂直圆柱研究层化海洋中波浪对透空结构物的绕射作用。通过分析二层海洋条件下边值的匹配问题，利用特征函数法提出内、外流场流体绕射势解析解，并在二层海况下计算透空圆柱所受水平波浪力及柱内、外的自由波面波浪爬高。计算结果分别与均匀海中透空桩柱和二层海中非透空桩柱的相应结果加以比较，分析得出在层化海洋中结构物的透空性对减弱波浪力和波浪爬高有很大影响。

英文摘要：

To study the wave hydrodynamic characteristics on porous bodies, a large diameter vertical circular cylinder is studied in a two-layer fluid. Fitting in with boundary qualification, the analytic solution for the diffraction problem about the interior and exterior region of the cylinder is obtained by the Eigen-Function Expansion. The water wave forces and wave run-up on a porous vertical circular cylinder in two-layer ocean are computed. To make the result comparisons between porous cylinder in uniform ocean and impermeable cylinder in two-layer ocean, it is found that the permeability of the cylinders may have a significant influence on weakening the wave force and wave run-up.