Landslides susceptibility mapping based on geographical information system,GuiZhou, south-west China |
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Authors: | Wei Dong Wang Cui Ming Xie Xiang Gang Du |
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Institution: | (1) School of Civil Engineering and Architecture, Central South University, 22 Shaoshan South Rd, 410075 Changsha, China;(2) Present address: Virginia Tech Transportation Institute, Virginia Polytechnic Institute and State University, 3500 Transportation Research Plaza, Blacksburg, 24061, USA |
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Abstract: | The purpose of this study is to assess the susceptibility of landslides around the area of Guizhou province, in south-west
of China, using a geographical information system (GIS). The base map is prepared by visiting the field area and mapping individual
landslide at a scale of 1:500,000 topographic maps. In the study, slope, lithology, landslide inventory, tectonic activity,
drainage distribution and annual precipitation were taken as independent causal factors. Therefore, six causal factors maps
are prepared by collecting information from various authorized sources and converting them in to GIS maps. The susceptibility
assessment is based on the qualitative map combination model and trapezoidal fuzzy number weighting (TFNW) approach. Using
a predicted map of probability, the study area was classified into four categories of landslide susceptibility: low, moderate,
high and very high. In addition, the weighting procedure showed that the TFNW is an efficient method for landslide causal
factors weighting. |
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Keywords: | Landslides susceptibility mapping Geological information system Landslide Fuzzy number Weighting methodology |
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