河道内樹木の流失限界に関する水理実験及び河床変動解析モデルの適用

抄録

Fine sediment tends to deposit in and around trees on bars during small and medium scale floods. On the other hand, trees are flowed away by large scale floods and the deposited fine sediment in and around trees are transported again. The transported fine sediment deposits at water intakes, weirs, river mouth and so on. In order to manage trees in river considering disaster prevention, water utilization and environmental conservation, the spatiotemporal change of sediment transport characteristics due to invasion, growth and removal of trees should be clarified. In this study, uprooting of a tree is introduced in horizontal two dimensional bed deformation analysis model and reproduce the sediment transport characteristics during large scale floods. Furthermore, the management method of trees in rivers is discussed with focusing on sediment transport characteristics.