Potential Analysis and Deposition Characteristics of Hillslope Debris Flows

• Main Authors: Chen Bor-Long, 陳柏龍
• Other Authors: Chen Tien-Chien
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/66885761352367398169

碩士 === 國立屏東科技大學 === 水土保持系所 === 101 === This study proposals a potential analysis model for the hillslope debris flow. 44 hillslope debris flows and 44 non-debris flow in Kao-ping River induced by Typhoon Morakot are employed in the analysis model. 14 factor were selected, included the index of landslide area ratio that predicted by SHLASTAB model. The result of the discriminant analysis shows the classification rate reached 81.8% in which the catchment indicators, watershed area, area percentage of prediction landslide, effective watershed area, watershed average slope, and effective watershed average slope are the most effective indexes to the analysis. The area percentage of prediction landslide is the maximum impact factor in all of factors meaning that a good prediction to the landslide potential does increase the prediction of hillslope debris flow. The potential model is proposal as well which also classified the hillslope debris flow into low, medium, and high potential. Last, this thesis proposal the evaluation model on deposition volume. Two evaluation formulas are composed from the deposition volume data form field in two circumstances, the extreme weather heavy rain and strong earthquake conditions. First, the formula V=107812A0.75 is proposal on the extreme weather heavy rain case. Nest formula V=5409A0.44 is used for the case of the deposition volume of hillslope debris flow after strong earthquake shortly. Furthermore, the deposition length for a hillslope debris flow is proposed as VL=40.61V0.166.