The Debris Flow Screening Efficiency of the Screen Device with the Large Inclination

• Main Authors: Kuo-Kai Hung, 洪國凱
• Other Authors: 段錦浩
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/48100700839728364108

碩士 === 國立中興大學 === 水土保持學系所 === 94 === The main function of the infiltration screens is to separate debris flow and transform to general sand flow. This device can adjust the outflow of the debris and avoid the direct impaction from the debris flow. And some sand-trapping capacity can shift to the downstream. In the past researches, we can find that the debris flow affected by the plain screening device. There is a repeated phenomenon of move and stop of the debris flow. And, at last, it stops. The debris flow passes over the dam. This study improves the plug of the screen device and designs five models of 31°- 39° inclination bottom infiltration screens. The coarse cobbles can move along the main channel to the predicted deposit places. This experiment observes debris flow to stop or deposit by changing the height difference of two check dams and the railing bar length. We obtain the dimension less formula for length of rails in bottom infiltration screen(L/d60) angles of the screen device(θ) screening ratio and separating flow ratio(W). As follows： S = -0.2959 + 0.016θ+ 0.0675(L/d60) R2 = 0.7525 W = -72.9217 + 3.675θ+ 0.586(L/d60) R2 = 0.537