In a beach or a shallow area, there are a few cases that coastal dikes were destroyed directly by strong wave force. On the other hand, a lot of field cases show that scour and suction caused by the continuing action of waves bring their destruction gradually. Therefore, it is important for us to establish prediction methods of suction rate from within the coastal dikes. In this paper, we improve Ioroi et al.'s formula so that the suction rate is gotten with high accuracy by using the settling velocity of Rubey. Then, we reveal the influence of coefficient of uniformity and dry density to the suction rate using experimental data. Moreover, we examine how to get the suitable values of the flow velocity and the excess pore pressure using CADMAS-SURF, and confirm that the calculated values agreed with experimental values.
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