A semi‐analytical method for the wave‐induced seabed response

A general semi‐analytical method is presented for the analysis of seabed response under wave action during a storm. The seabed is idealized as a poro‐elastic medium filled with a single compressible fluid with anisotropic flow. The coupled process of fluid flow and deformation of soil skeleton is formulated in the framework of Biot's theory. The analysis for the response of homogeneous seabed of finite thickness under a plane progressive wave is developed first, followed by an extension for the case of a layered seabed. A generalization for three‐dimensional response of seabed is also developed for a general wave field which provides the analyses for seabed response under short‐crested or standing waves in the vicinity of a structure. Some numerical examples illustrating the proposed analyses are also presented.