Theoretical Analysis of Wave Action with Perforated Caissons on Porous Seabed

The analytical solutions of wave induced horizontal and vertical forces on perforated caissons resting on porous elastic seabed have been established. The solution in the seabed is divided into a symmetric part and an anti-symmetric part. A numerical experiment has been carried out to examine the effects on horizontal forces, vertical forces and phase lags between them due to the relative wave chamber width (ratio of the width of wave chamber and perforated caisson), the front plate porosity and the seabed combined factor. The numerical results show that the vertical forces can reach minimum with suitable relative wave chamber width. The phase lags of horizontal and vertical forces increase with the increase of seabed combined factor and have peaks at the range of wave number kd = 0.5~1.0.