Potential Analysis of Debris Flow Torrents in Nantou Area
Date Issued
2007
Date
2007
Author(s)
Hsieh, Yu-Hua
DOI
zh-TW
Abstract
Every year typhoons cause ground disaster in Taiwan, and the debris flow is one of the most serious ground disasters in Taiwan. With grading the of debris flows torrents and understanding of the most main influence factor, it will provide information for disaster reduction management.
This research collects debris flow related data in Nantou and the debris flow major disaster affairs. The debris flow torrents potential analysis was performed based on the 1420 debris flow torrents by Soil-and-Water Conservation-Bureau (2003). Select eight suitable debris flow influence factors that includes basin area, streams length, form factor, hypsometric integral, stream mean slope, slope distribution, slope aspect and geology category etc. were selected Principle Component Analysis was used to extract category item factors, such as slope distribution, slope aspect and geology category, and Discrimination Analysis was conducted for the potential of debris flow torrents in Nantou county.
In this research, three potential analytical mode were proposed as " potential analytical mode one", " potential analytical mode two" and" potential analytical mode three". Given altogether the 199 debris flow torrents in Nantou ratings for high, medium, low. 70 debris flow torrents were classified as the high potential, 79 debris flow torrents as medium potential, and 50 debris flow torrents as low potential, respectively. From the result of the potential analyzes, it appeared that most significant influence factors of debris flow in Nantou region are hypsometric integral and geology category Mj. Results of discriminate analysis of debris flow torrents were improved by taking into account the different geology divisions. Principle Analysis extracted category item factors effectively and made discrimination analysis more convenient.
Subjects
南投
土石流
區別分析
影響因子
潛勢
debris flow
Nantou
potential analysis
discrimination analysis
influence factor
Type
thesis
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