| Wave force and stability of tetrapod for block mound seawalls were examined for steep foreshore conditions by two-dimensional hydraulic model tests. The damage mechanism was disclosed based on the time series of wave force acting on tetrapod by three-componet dynamometer. For the condition of h/L=0.021 and h/Ho=0.5、 the necessary mass of tetrapod becomes larger than the calculated mass by Hudson type design formula、 and the modification methods were proposed. Furthermore、 foot protection blocks with high density concrete were proved to be effective to stabilize tetrapods of block mound seawalls.block mound seawall |
