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|標題:||An Experiment for the Debris Flow Screening Efficiency by the Screening Bar Length of the Plain Screen Device
chih, Lin yen
|關鍵字:||debris flow;土石流;plain screen device;screening ratio;平面柵;篩分比||出版社:||水土保持學系||摘要:||
The plain screens can make debris flow dehydration and debris depositing. They can avoid the damage made by direct impaction of the debris flow and improve the problem of insufficient sand-trapping capacity. And the improved plain screens has channels to separate flow at downstream so that the water and fine particles can flow through by-pass to downstream. Then, the coarse cobbles can move along the main channel to the predicted deposit places.
With the coming of debris flow, water and slope are the key factors of moving power. For the debris flow moving along the plain screen device, this device will screen out water and fine gravel. Coarse cobbles will block the plain screen device because the cobbles is bigger than the gap of the screening bar. For the bigger debris flow moving along the plain screen device makes the screening time and screening ratio lower. When the screening bar length increase, screening ratio and screening space will become more and more and it can extend the screening time. If we can control the debris flow discharge, we can analyze the tendency of screening ratio with the factor of screening bar length in different channel slope and screening bar length. We can disscuss the change of the tendency when the channel slope changes.
Keyword: debris flow, plain screen device, screening ratio
|Appears in Collections:||水土保持學系|
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