岸壁に作用する局所流による三次元洗掘予測手法の開発と対策工に関する研究

抄録

Local scour in front of a quay wall due to a jet flow is investigated using a three-dimensional two-way coupled fluid-sediment interaction model (FSM). Numerical results computed using FSM are analyzed and compared with experimental data measured in hydraulic tests. A model parameter involving the sediment transport and the boundary condition of the wall are determined in such a way that the root mean square error of the final seabed profile is minimized for a reference case. The predictive capability of FSM is validated against experimental data in terms of average flow velocity along the jet flow, excess pore-water pressure in the seabed, and final seabed profiles. The effectiveness of filter units against local scour and resulting instability of the wall is demonstrated in terms of excess pore-water pressure predicted using FSM.