標津川の蛇行試験区間の河道変遷とその維持機構の物理的な解釈

抄録

The re-meandering project in the experimental section where straightened channel was connected to horseshoes laker as 2-way channel have been conducted in the Shibetsu river in the east-northern part of Hokkaido since 2002. A maintenance method of the 2-way channel with distributary weir have not been established because a process of channel change doesn’t well understood. In this study, discharge-variations to responses of channel change were investigated with cross section profiles, orthogonalized aerial photographs and hydrological data such as water level and discharge. It was found from the results that, a dependence of the weir under summer flood discharge condition is smaller than usual discharge conditions. It is important to keep discharge to generate satisfying tractive force in order to maintain the re-meandering section.