波浪在可渗海床上传播时的衰减

Wave Damping due to Porous Seabed Effect

在以往的波浪理论研究中,通常假定海床是不可渗的.但在浅水区,海床的可渗性对波浪的传播有一定影响,它能引起波高的衰减,同时波浪也能够引起海床的变形、滑动、甚至液化.当海床的弹性小、渗透性大时,波浪与可渗海床的这种相互作用更为明显.本文通过对波浪场控制方程——拉普拉斯方程和弹性海床的控制方程——比奥方程联合解析求解,给出了海床土体响应、孔隙水压变化规律,以及波高在传播过程中的衰减.

In the past wave propagation research it was usually assumed that the seabed is impervious. But in the shallow water area seepage phenomenon in a porous seabed has a certain effect on wave propagation. It can cause wave damping. Wave seepage can also induce seabed deformation, sliding, and even liquefaction. When the elasticity of seabed is small and the porosity is large, the interaction between wave and seabed is more significant. In this paper, seabed response , porous water pressure and wave damping are given by analytically solving the governingequation of wave field——Laplacian equation and the governing equation for seabed response——Biot equation simultaneously.