REAL-SCALE NUMERICAL ASSESSMENT OF ARTIFICIAL REEF IN IDA BEACH

In this study, to evaluate the effectiveness of the FS3M for assessing the countermeasures of beach erosion, the model was applied to the real-scale domain. We used the FS3M, which is a computational fluid dynamic model using the Navier-Stokes equation, and the survey data provided by Mie Prefecture. To address the problem of calculation cost, the numerical method called long-term estimation was used to calculate the evolution of the beach profile on the gravel beach. The validity of FS3M was investigated by applying the parameters used in the reflective type beach to the step type beach. The model reproduced well the position of the berm but shows a problem in the profile change under the water. However, in the process of wave propagation to the rear of the artificial reef, the reduction of the wave energy decreases the wave steepness, and the beach profile change for reflective type occurs predominantly. This fact shows that FS3M can be used to reproduce the beach profile change and evaluate the effects of artificial reef.