Potential Analysis of Debris Flow Torrents Considering Spatial and Rainfall Variations
Date Issued
2012
Date
2012
Author(s)
Chuang, Han-Hsin
Abstract
Taiwan is situated in the junction of tectonic plates, which causes fragile and complex geological condition. In recent years, mountainous areas have been overdevelopment, and slope failures often occur. Moreover, typhoons carrying torrential rainfalls often cause debris flow. Recently, there are two typhoons causing severe debris flow in the Kaohsiung area: Typhoon Kalmaegi in 2008 and Typhoon Morakot in 2009. Therefore, this study focused on the debris flow potential analysis in order to understand the predisposing factors and environmental factors, which affect the occurrence of debris flow.
In our study, debris flow information and disaster events in the Kaohsiung area were collected, based on the 1578 debris flow streams in Taiwan published by Soil and water Conservation Bureau (2011). We investigate torrents of predisposing factors and environmental factors for potential debris flow. Potential torrents analysis of debris flow selected important environmental factors was performed, using Fisher discriminant analysis to analyze potential debris flow. Then the discriminant model based on Kaohsiung is used for prediction of Tainan and Chiayi counties. We used hot spot analysis for investigating the relationship of disaster points and their rainfall parameters. Explore the relationship between predisposing factors and environmental factors on the occurrence of debris flow.
Our study found that the occurrence of debris flow mainly influenced by the predisposing factors, and environmental factors. The rainfall threshold conditions for inducing decreased as debris flow potential increased. Predisposing factors are important conditions for causing debris flow.
Subjects
debris flow
typhoon
Fisher discriminant analysis
hot spot analysis
potential analysis
Type
thesis
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