A CALCULATION OF OVERTOPPING FOR IRREGULAR WAVES UNDER SEVERE WAVE CONDITIONS BY CADMAS-SURF

A seawall has to prevent a hinterland from incoming waves. The design of such maritime structure had been performed by hydraulic model tests or diagram conducted from experimental results. In recent years, precise numerical methods have been applied to the design of maritime structure. CADMAS-SURF is one of highly precise numerical models, and its applicability has been verified for various coastal phenomena. Although one of the authors proposed a method for generating irregular waves in the CADMAS-SURF, there is a problem awaiting for solution that a total mass variation of fluid in the model becomes greater with time step for H1/3/L1/3>0.02.In the present study, a modified method for generating irregular waves is proposed and verified by results of a hydraulic test. In the result, 1) a total mass variation of fluid is reduced to less than 1% for severe wave steepness, H1/3/L1/3 is about 0.06, 2) the calculated value shows good agreement with experimental data for over topping.