Abstract
Macroscopic laws of unsteady fluid motions through a porous media yields a nonlinear complex valued differential equation, whose coefficients can be determined from the experiment of oscillatory flows using U-shaped channel, incorpolating the phase shift between the pressure gradient and the averaged velocity. Using present equation, the reflection and the amplitudee decay of waves through the breakwater with a vertical wall are calculated and compared with experiments. Then, it is shown that the energy loss of an inlet of breakwater and the phase shift at the boundary should be considered as the boundary effects of porous media.
