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標題: 平面柵對土石流篩分功效之試驗研究
An Experiment for the Debris Flow Screening Efficiency by the Plain Screen Device
作者: 謝宗憲
Hsieh, Tsung-Hsien
關鍵字: 土石流;debris flow;透水柵;平面柵;bottom infiltration screens;plain screen device
出版社: 水土保持學系
The plain screen has the common advantages of the open dam. Besides, they can avoid the damage made by direct impaction of the debris flow and improve the problem of insufficient sand-trapping capacity. We place by-pass beside main channel in the 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 leave coarse cobbles. Furthermore, the movement of this debris only depends on inertial force and gravitation. The gravitation is related to slopes. If we can control the I-beam angles and find the effects under different angles, we can solve the problem of blockade by coarse cobbles. There are four kinds of screen angles designed with the channel slope. Four angles of the screen devices are parallel to the slope of original channel bed, 50% steeper than the original channel bed, buffered 50 % and 100 %. By adjusting slopes of plain screen device, we can realize what influences will cause debris flow to stop or deposit under different slopes of device.

Appears in Collections:水土保持學系

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