標津川蛇行復元試験地における砂州の形成と樹木の生育特性

抄録

It is said that the formation of sandbars in river channels is closely related to the growth of trees invading onto them, and is also controlled by the flow rate. The purpose of this study is therefore to clarify how sandbar development is related to factors such as flow fluctuations and tree growth. At the Shibetsu River meander restoration test site, detailed studies of sandbar formation and the invasion of vegetation onto them are being conducted in a rectangular channel. A vegetation survey was conducted by setting three survey sections (A, B and C) from the sides to the center of the channel in the transversal direction on a sandbar formed on a curve at the test site. The sediment accumulation height was compared with temporal changes in the flow rate and water level to study the relationships between them. Most of the trees here were Japanese fantail willow and Salix kinuyanagi.