抄録
Recently, it is found that the bottom sediments of many harbors of Japan are contaminated with the dioxin. Extremely fine material such as clay and silt adsorbs the dioxin, and has a tendency to quickly go into suspension during the dredging process. Therefore, sediment resuspension largely depends on the dredging technique adopted. In the grab dredging, the operation of a bucket controls the dispersion of dredged material.
The purpose of this research is to make the numerical model that is considered the resuspension mechanism, and to reduce the sediment resuspension of the grab dredging. As the first step, the flow of the bucket was reproduced by using the moving boundary model.
