Using statistical approach to discuss landslide susceptibility analysis based on different triggering events
Presenter: Huang Chih-Chieh
Abstract
Landslide susceptibility analysis (LSA) is different to slope stability analysis, which is capable be used on predicting shallow landslides without requiring the use of geotechnical, groundwater or failure depth data.
At early stage, the LSA was constructed by expert decision of scoring the values of landslide susceptibility factors and the weighting of relation between factors. These value of factors are used to calculate the landslide susceptibility index. In recent years, it is most common to use multivariate statistical methods to discuss the value of causative and triggering factors.
By using a geographic information system and a statistical method to integrate geomorphic, geologic and other relevant data, it is able to analyze the basic properties contributing to each landslide potential factor and the triggering factor. Three landslide susceptibility maps with different trigger factors were made and then were checked against actual landslides associated with the event, and the result showed similar patterns and values.
The study area is located in central Taiwan, at Kuohsing, as an example to demonstrate recent development in the LSA of Taiwan.
Reference
Lee, C. T., Huang, C. C., Lee, J. F., Pan, K. L., Lin, M. L., Dong, J. J.: Statistical Approach to Earthquake-Induced Landslide Susceptibility, Engineering Geology 100, 43-58, 2008
Lee, C. T., Huang, C. C., Lee, C. F., Pan, K.L., Lin, M. L., Liao, C. W., Lin, P. S., Lin, Y. S., Chang, C. W.: Landslide Susceptibility Analysis Based on Three Different Triggering Events and Result Comparison, Proceeding of International Symposium on Landslide and debris Flow Hazard Assessment, 6-1 ~ 6-18, 2004