A SEMIANALYTICAL METHOD FOR THE WAVE-INDUCED SEABED RESPONSE

A general semi-analytical method is presented for the analysis of seab ed 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 an alysis for the response of homogeneous seabed of finite thickness unde r a plane progressive wave is developed first, followed by an extensio n for the case of a layered seabed. A generalization for three-dimensi onal response of seabed is also developed for a general wave field whi ch provides the analyses for seabed response under short-crested or st anding waves in the vicinity of a structure. Some nuumerical examples illustrating the proposed analyses are also presented.