Relationship between landslides and lithology in the Three Gorges Reservoir area based on GIS and information value model

Abstract

Landslides, which develop in the Three Gorges Reservoir area, are related to many factors. Lithology is one of the indispensable internal factors, besides relative height differences, slope gradients and slope profiles. We used an information value model with geographical information system (GIS) technology to study how lithology contributes to the development of landslides from the Yunyang to Wushan segment in the Three Gorges Reservoir area and we quantify the relationship between lithology and development of landslides. Via an investigation of 205 examples of past landslides, we found that the lithology of J_3s, J_3p and T_2b contributes most. Our research results can provide a valid basis for future construction in the Three Gorges Reservoir area.

Key words： Three Gorges Reservoir area; landslide; lithology; geographical information system (GIS); information value model

Acknowledgements

This work was supported by the Fund for Youth Ph. D of Southwest University of Science and Technology (No. 07ZX7131), the Third Term Key Innovation Item of the Chinese Academy of Sciences (No. KJCX3-SW-L1-6), the National Science Project of the Ministry of Science and Technology of China (No. 2006BACO4B05) and the Item of International Co-operation of the Ministry of Science and Technology of China (No. 2007DFA21150).

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