2024 Volume 80 Issue 17 Article ID: 24-17178
To evaluate the hydraulic functions of the wave dissipating work, the resistance law was investigated by numerical calculations. First, as basic hydraulic functions, the reflection and transmission coefficients were measured by carrying out regular wave experiments. The model of wave dissipating work was set up as a rectangular cross-section with square timbers arranged in a regular pattern. Numerical calculations were performed using the numerical wave flume CADMAS-SURF. The linear and nonlinear resistive material coefficients α0 and β0 of the Dupuit-Forchheimer law (DF law), which is one of the resistive laws, were determined so that the experimental values are reproduced well. Calculations were also conducted with the square timbers of the wave dissipating work set up as a structure cell.
Both calculations using the DF law and with square timbers as the structure cell were reasonally confirmed to reproduce the experimental values of the reflection and transmission coefficients. The effect of α0 on the reflection and transmission coefficients was small, while the effect of β0 was large. This indicates that the resistance of the wave dissipating works is dominated by the drag force proportional to the square of flow velocity.
