Establishing hillslope failure susceptibility model based on the Soil Water Index and Frequency Ratio Method
碩士 === 國立中興大學 === 水土保持學系所 === 105 === In the face of the threat of the landslide disaster, establishing warning systems and evacuating inhabitants are recognized as effective approaches for disaster risk reduction. The study used the collected 79 disaster cases in the Kaoping River Basin from 2006 t...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2017
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| Online Access: | http://ndltd.ncl.edu.tw/handle/32529188559609007848 |
| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 105 === In the face of the threat of the landslide disaster, establishing warning systems and evacuating inhabitants are recognized as effective approaches for disaster risk reduction. The study used the collected 79 disaster cases in the Kaoping River Basin from 2006 to 2016 to establish Soil Water Index (SWI) threshold value for warning sediment-related disasters. The results show that landslide disaster cases mainly occur when the SWI>160mm and SWI has a linear relationship with the depth in the second tank. Two alert types of the SWI were derived, yellow alert value of 160mm and red alert value of corresponding to the intersection of the critical line of disaster cases of 70% coverage and the regression line. Furthermore, this study builds the landslide susceptibility models based on the landslide inventory caused by 2009 Typhoon Morakot in Kaoping River Basin by using frequency ratio methods. Seven geomorphological factors highly correlated with the distribution of landslides were involved in the landslide susceptibility model. The precision of this model was verified by classification error matrix and the correct ratio is 72.1%. Finally, the study established hillslope failure susceptibility value of sediment-related disasters combining the hazard level and landslide susceptibility analysis to be the basis of warning release.
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