Abstract
A combined BEM-FEM model has been developed to simulate the dynamic interaction between non-linear waves and an impermeable seawall with a submerged rubble toe over a sand seabed. A poro-elastic finite element model has been developed and used under the surface pressure computed by the BEM-FEM model. Modified Navier-Stokes equations are used to solve the flow inside the porous media and Biot's equations for the solid particles' displacement. The wave deformation and its induced pore-water flow are studied for different hydraulic properties and sizes of the toe. The effects of the seabed shear modulus and thickness on the solid particle displacement, pore-water pressure and dynamic stresses are investigated.