バウスラスターによる岸壁前面の局所洗掘と袋型被覆材による対策に関する研究

抄録

Strong flow generated by bow thruster may cause a severe local scour on the seabed in front of a quay and its countermeasure is required for effective use of port facilities. This study is intended to investigate local scour and its generation mechanism by conducting hydraulic model experiments. Also, countermeasures against local scour using armor stones and filter units are investigated. In the experiments, pore pressure inside seabed is measured as well as flow velocity and bed deformations. Time variation of pore pressure indicates the generation of liquefaction due to strong flow, and this may encourage the local scour. Experimental results clearly show that armoring by filter units is effective to reduce the local scour.