本文研究坡面型土石流之潛勢分析方法,並驗證其判釋結果。採用莫拉克颱風風災後之高屏溪流域坡面型土石流與未發生土石流之坡面資料各30處,萃取出判釋率最高之特性因子,配合修正過後之SHALSTAB淺層崩塌預測模式,利用區別分析方法進行坡面型土石流發生潛勢分析,區別分析結果以形狀係數比、坡面平均坡度比、有效集水指標、發生區平均寬度、流動段平均坡度、流動段深寬比、崩塌潛感面積、q/t值百分比等8項因子為預測變數時正判率最佳,整體正判率為90%。驗證樣本同為莫拉克颱風風災後高屏溪流域之坡面型土石流與一般坡面資料各10處,驗證結果分類良好,代入區別函數得到結果之正判率為85%,表示此坡面型土石流潛勢分析模式於高屏溪流域有良好分類效果,並依據前人潛勢分級方法,擬訂坡面型土石流致災危險潛勢分級,可供日後坡面型災害潛勢預估使用。
This study proposals a potential analysis model for the hillslope debris flow and verify the model results. 30 hillslope debris flows and 30 non-debris flow in Kao-ping River induced by Typhoon Morakot are employed in the analysis model. 20 factor were selected, included the index of landslide area ratio that predicted by SHALSTAB model. The result of the discriminant analysis shows the classification rate reached 90% in which the catchment indicators, form factor ratio, q/t area percentage of prediction landslide, landslide susceptibility area, average width of effective watershed, hillslope aspect ratio of flow, average slope of flow, and hillslope average slope ratio are the most effective indexes to the analysis. The verification result of HDF potential analysis model which correctly distinguish between HDF and NDF are reached 85%. The potential model is proposal as well which also classified the hillslope debris flow into low, medium, and high potential.
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