豪雨時の斜面崩壊過程を考慮した分布型降雨土砂流出モデルに関する研究
キーワード:
distributed sediment runoff model,
mixed grain size,
slope failure process,
large-scale flood event,
Yahagi Dam catchment
2009 年 15 巻 p. 429-434
詳細
2009 年 15 巻 p. 429-434
The objective of this research is to improve the accuracy of a distributed rainfall and sediment runoff model for better reservoir sediment management. This paper describes an advanced distributed-parameter rainfall and sediment runoff model, which considers sediment materials with mixed grain sizes in riverbeds and slope-failure processes on hill slopes. Applied to the Tokai severe storm event in September 2000, the model constructed here shows very good prediction results of slope failures at 382 grid-cells and yielded sediment of 1,528,000 m3,which is in good agreement with the observed slope failures at 405 locations and sediment of 1,620,000 m3 in the Yahagi Dam catchment(504.5 km2) in Chubu, Japan, during the event.
