2Way河道の自律的な維持を可能にする適切な流量配分比の推定手法の提案

抄録

On the Shibetsu River, there has been a project to reconnect previous meandering channel remaining as oxbow lakes with the current river channel. In this project, the two-way channel method which allows straightened parts and previous meanders to co-exist was adopted for restoring the rich natural environment had been lost by straightening while maintaining the function to flow flood water safely. A variety of surveys on the test site profiles were conducted over seven years in the site. In this study, the consideration of the discharge ratio of a two-way channel was conducted with the focus on bed deformation of the channel. Also verification of measurement data via non-uniform flow calculations was conducted. The water levels of meandering and straight parts were calculated. The flow distribution ratio was found to be estimable from the difference in cross-sectional areas of flow at the diverging points.