WAVE OVERTOPPING ESTIMATION THROUGH CADMAS-SURF: A FOCUS ON DUPUIT-FORCHHEIMER LAW

This paper estimated the wave overtopping discharge rate of sloping breakwaters armored with wave dissipating blocks using CADMAS-SURF/3D, with a focus on Dupuit-Forchheimer law. Numerical simulations were first performed using the empirical coefficient values (𝛼0 and 𝛽0) provided by previous researches (required for the Dupuit-Forchheimer law). The numerical results were then compared with the experimental data of Watanabe et al. (2021)1), and both minimal and significant deviations were found out. Consequently, a sensitivity analysis was conducted to examine the influence of the 𝛼0 and 𝛽0 values on wave overtopping. The influence of 𝛼0 on wave overtopping was found to be quite minor compared to that of 𝛽0, and lower values of 𝛽0 appeared to correspond with increasing wave overtopping discharge rate. Afterwards, through a comparison of the experimental and numerical results, the coefficients were optimized, particularly for the wave dissipating blocks. The 𝛽0 values that well-aligned with the experimental values were observed to be dependent on porosity and surf similarity parameter.