| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 99 === This study investigates the landslide susceptibility analysis in Aowanda area. This study applied TRIGRS code to simulate the rainfall-induced seepage influence of the roadside slopes stability of Aowanda area under heavy rainfall attack of Typhoon Sinlaku in 2008. To increase the reliability of the simulations, this study adopted topography index and Rosenblueth point estimate method. Also, zonation was made according to the field investigation and remote sensing data for better assuming the simulation parameters relating to in-situ condition. The permeability is high in the weathered slate formation of Aowanda. Roadside slope stability is less influenced by scattering rainfalls. The cumulated rainfall and the landslide area is not necessary proportional. For steep slopes, the failure probability will increase even only with an average rainfall amount. In contrast, for gentle slopes, the failure probability will gradually increase only after significant amount of rainfall. The comparison between the calculated and actual landslide area is satisfied using TRIGRS for the landslide source areas of Aowanda. In the analysis, the TRIGRS model was used for slope stability analysis, and the result was compared by carefully validations of predicting landslides. The area under the receiver operating characteristic (ROC) curves for TRIGRS model was 92%.
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