天竜川下流河道における植生域の拡大・破壊と土砂捕捉に関する長期予測モデルの開発

抄録

A numerical simulation model was presented to predict the long term change of vegetated area and the resulting deposition of fine sediment at the down stream reach of the Tenryu river. In constructing the model, the river cross-section was divided into three areas, main flow area, bare bar area and vegetated area, in which the flow velocity at three areas and the deposition of fine sediment at vegetated area were calculated by using mass and momentum balances of each area and the cross-sectional transport of suspended sediment. It was found that the present simulation model can roughly estimated the transition of vegetated area and total amount of sediment deposition. The long-term change of vegetated area and sediment deposition was investigated by using the model.