斜入射水波对直立防波堤的波浪渗流作用

Oblique water wave-induced seepage effects on vertical breakwater resting on permeable seabed

基于Biot渗流固结理论和水波绕射理论,应用特征函数展开法,推导了对应直立防波堤的绕射波势和波浪引起的海床内渗流压力分布的解析式,由此计算了作用于直立防波堤底部上由波浪渗流压力所导致的浮托力和倾覆力矩,并与水平波浪力和力矩进行了相应比较。计算结果表明,在一定条件下,波浪渗流作用与水平波浪作用可以具有相同的量级。波浪入射角,防波堤前侧透空及海况条件防波堤几何尺寸等因素的相对变化对波浪渗流作用均存在一定的影响,其中对渗流倾覆力矩的影响更为明显。

Based on Biot seepage consolidation theory and wave diffraction theory, the analytical solutions to the diffracted water wave potentials and the wave-induced seepage pressures referring to vertical breakwater resting on permeable elastic seabed are derived by applying the eigenfunction expansion approach, and then the wave- induced lift force and overturning moment caused by the seepage pressure on the bottom of vertical breakwater are accordingly evaluated and compared with the direct wave force and moment. The numerical results demonstrate that in certain condition, the wave-induced seepage loads may have the same order of magnitude as the direct wave loads. The variation of incident wave angle, porous on the front surface of breakwater and structure geometry under ocean condition may have some influences on wave-induced seepage loads, especially on the wave-induced seepage overturning moment.