急流礫床河川における低水路護岸沿いの深掘れ流路形成とその特性

抄録

The low water revetment is installed for the purpose of mitigation of scour depth along the riverbank and bank erosion. However, if low water revetment is installed, the sand supply from bank erosion stops, moreover, the velocity along the low water revetment will increase the situation where the river bed along the riverbank is made to scour further as a result. Furthermore, the channel made along the riverbank is fixed and there is a possibility of bringing more flood discharge together along the riverbank. Furthermore, since the comparable height difference with the channel also increases in the flood plain and flow channel, the erosion width at the time of bank erosion occurring becomes larger, and the danger that erosion will reach even to the bank increases. This study investigates the relationships between the installation of low water revetment and the secular change of channel change in the Joganji River. And, we consider the measure of bank erosion by the bed material without using the low water revetment.