| Summary: | 碩士 === 國立屏東科技大學 === 水土保持系所 === 105 === Taiwan terrain was changed by large geological crushing, frequent earthquakes and typhoons haves the results of landslide, siltation and water and soil resource flows. In this study, the Cengwen reservoir watershed was studied and the satellite images were used in 2009 to 2013. The geographical information system was used to analyze the factors of slope, aspect, geology, soil, elevation and vegetation. The potential collapsing position of the catchment area is analyzed, and the potential of the potential collapse index and the weight value of each index are calculated by the instability index method. The analysis results show that the main collapse factors were affected by geology, elevation and vegetation. Finally, the potential collapse of these influencing factors are plotted as a landslide susceptibility map to assess the potential collapse probability.
Based on the research, the conclusions are described as : (a) based on the potential analysis to compare different factors affect the collapse grading difference, the results show instability index method to predict the collapse of the accuracy of the results forecast accuracy reach 70% for each year, the actual collapse in 2010 in the high potential area and high latent sensing area of 74.910%. (b) The failure potential of this study includes the slope, aspect, soil, elevation, geology, among which the probability of collapse of geological, elevation and vegetation is the highest, located in the platform and the elevation is 500 to 500 meters. The area of the ruler has a higher chance of collapse in each year. The potential of the scope of assessment (c) research division, in order to collapse susceptibility of the 2010 high and high latent sense region accounted for 81.97% , its collapse area of distribution of the three Gorges are based on the layer up to the total collapse area of 81.80 percent, the collapse area on the percentage of the third level slope are accounting for 51.12% of the collapse of the area, and the southeast slope to the total collapse area of 20.57%.
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