Development Technology Research On Landslide Hazard Mapping In Guizhou Province And Slope Stability Analysis System

Varieties of geological hazards distributed in the mountainous area in western China, especially the landslides, which seriously threaten the lives and property of local people. Landslide susceptibility mapping is a branch of the spacial early warning and forecasting technology, which could evaluate the landslide susceptibility quantitatively or semi-quantitatively in the study area, establishing the landslide susceptibility map. So, applying this technology to the infrastructure planning and construction is meaningful for disaster prevention and reduction of the project.As to one certain slope, to analyze mechanically is the most direct and reliable way to judge its stability. And result of the stability analysis could be the guidance to the protection and treatment to the certain slope.This paper combine the macroscopic mapping and specific slope analyzing, the main contents are summarized as follows:1) According to the historical data of landslides in the study area, entropy based weighting model was built to calculate objective weights of causal factors. Trapezoidal fuzzy number weighting method was used to evaluate the importance of subclasses of a causal factor. The landslide susceptibility mapping theoretical model was built based on the subjective and objective weighting.2) By using the system geoprocessing tool and Python scripting, which based on the geoprocessing framework of ArcGIS, the subjective and objective weighting model was built, and achieved the automatically landslide susceptibility mapping in Guizhou province.3) The landslide susceptibility mapping model was packaged and published as geoprocessing service to the ArcGIS Server, making the remote sharing and secondary development become possible.4) According to Fuzzy evaluation theory, Sarma method and Imbalance thrust force method, three model were built to analyze the stability of slope, from both certain and uncertain aspects.5) Based on rich internet application (RIA) technology and WebGIS technology, the landslide hazard mapping and slope stability analysis system was constructed, realizing the internetization of landslide susceptibility mapping and slope stability analysis.