Quantitative Study of the Landslide Risk of Reservoir Watersheds in Taiwan

臺灣水庫集水區崩塌危險度定量化之研究

李錦育(Ching Yuh Lee)

《臺灣省立博物館半年刊》 45卷1期 (1992/06) Pp. 19-27

https://doi.org/10.6532/JTM.199206_45(1).0003

摘要

The purpose of this study was to quantify the landslide risk of reservoir watershed in Taiwan. Analysis of the estimative parameters are as follows: watershed area (A), average slope (S), average relief (R), annual rainfall (P), maximum one-day rainfall (M), ratio of forests (F), ratio of landslide area (DL), and geologic index of sediment yield (SGI). As the result of calculation, which used the step-wise regression analysis by means of the LOTUS 1 2 3 and STATGRAPHICS packages, the regression equation is: Log (Y) 2.76 + 1.485 Log(R) +3.831 Log (M) -9.405 Log(F). The effect of sediment yield (Y) could be arranged as M＞F＞R. The application of the result will be to offer the prediction of landslide risk in different return periods of reservoir watersheds and use the parameters are also discussed.

關鍵字

Step-wise regression ； landslide risk ； geologic index of sediment yield (SGI)

並列摘要

本研究之主要目的，乃在定量水庫集水區之崩塌危險度；因此，選擇集水區面積（A），平均坡度（S），平均起伏量（R），年雨量（P），年最大日雨量（M），森林面積率（F），崩塌面積率（DL）和淤砂地質指數（SGI）等作爲評估參數，根據逐步迴歸分析法，求得下式：Log(Y) = 2.76 + 1.485Log(R)+3.831 Log(M)-9.405 Log(F)而對淤砂量（Y）之影響力，依序爲M＞ F＞ R。本研究對於不同迴歸週期之崩塌危險度預測上，具有良好的結果；且可利用此指標，以減少類似災害之發生及確保該區域居民之生命財產的安全。

並列關鍵字

逐步迴歸 ； 崩塌危險度 ； 淤砂地質指數