Application and Research of GIS-based Wushan County Slope Stability Evaluation Information System

Evaluate and study Wushan County slope stability to provide decision-making basis for urban planning and design. Supported by MAPGIS software, Wushan County slope stability evaluation information system was researched and developed to achieve the automated process of slope stability evaluation from input of basic data to the output of evaluation results. Functions provided by the system include data input and output, data query, evaluation database generation, evaluation model parameter calculation, evaluation model calculation, and evaluation result mapping. The paper analyzed the factors affecting Wushan County slope stability, and concluded several affecting factors including lithology, geological structure, groundwater and topography. The study area was divided into 14,450 units by 10m x 10m grid, and a Logistic regression model was built with factors affecting landslide as independent variables, and information of landslide sections as dependent variable. Cluster analysis was conducted on the P value in Logistic regression results of the 14,450 grid units to achieve site stability evaluation. Evaluation results were: the stability zone accounts for 9.51% of the site area, potentially stable zone for 61.11%, potentially unstable zone for 17.52%, and unstable zone for 11.86%. Evaluation results are in line with the actual situation of the study area, which can provide geological basis for the decision-making of relevant departments. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Harbin University of Science and Technology