|
Abstract Geographic information system(GIS) and the third theory of quantification are used to analyze the influential factors of landslide development and the coupling intensity of the factors，and to discuss the geological environment factors of landslide development in the study area of Langxian in Tibet. The results show that rainfall，lithology，average slope and the distance from the slope forward to the river are the leading factors of landslide development. The height of slope，outside force，human engineering activities and seismic intensity play important roles in landslide. The land use affects the landslide slightly. Average annual rainfall，the landslide lithology with residual slope wash and sericite phyllite，the distance within 200 m from the slope forward to the river，the average slope of 35°–45°，seismic intensity and the height of slope higher than 200 m can be taken as the controlling factors which can provide reference for the assessment of landslide. The coupling intensity of influential factors of 29 landslides in the study area can be divided into 3 levels as strong，medium and weak which are bounded by ±0.01. The higher the coupling intensity is，the higher the risk of landslide and the degree of landslide development are. The above-mentioned conclusions are important to the disaster prevention and mitigation. The analytical results have been verified by site investigation which certifies the feasibility and the adaptation of third theory of quantification and they can provide new idea for analyzing the factors of landslides.
|
|
Received: 25 February 2010
|
|
|
|
