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

Abstract

 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.