Abstract: Dynamic interaction between waves and poroelastic seabedis investigated in relation to the boundary layer near the seabed. Potentialtheory is applied to describe the wave field and a boundary layermodification is considered. The deformation of the seabed is governed byBiot's consolidation theory. Stress and velocity continuity at the interfacewill be coupled with the wave motion and the relevant seabed response. Underthe assumptions of small amplitude waves and small deformation of theseabed, an analytical solution is obtained and shown to be in good agreementwith field data. The conditions under which wave-seabed interaction becomessignificant are also discussed.