蛇行低水路の土砂堆積に及ぼす樹木群の影響

抄録

In the place where the low water channel of compound channels meanders, it is made clear that the velocity becomes slow and sediments tend to deposit on the river bed. However, it is not yet clatified about the effects of vegetation along meandering low water channel on bed variation. In the Tokoro river, sedimentation on the low water channel bed seems to yield effects on the flood control, since the low water channel is meandering and vegetation is growing thick along the low water channel. The objectives of this paper is to clarify effects of vegetation along meandering low water channel on sedimentation, by observed flow and sedimentation data and unsteady two-dimensional analysis. As the result, we showed that sediment deposition is remarkable in the meandering low water channel with vegetation, although there is a little sediment deposition in the straight low water channel.