GIS-based Risk Evaluation For Landslide In Mianxian County

Due to a variety of factors, geological disasters occurred frequently in recent years, giving people a huge loss of life, had cause for concern. Shaanxi is the southern region of geological disasters are more serious, especially landslide hazards.In this paper, the research scope of Mianxian County, Shaanxi, landslides in mountainous areas to focus the study, on the basis of extensive field investigation work, first of landslide disaster in this region have been classified,and analysis of the distribution and development regularity of landslide hazards, explore the causes of landslide geological environmental conditions and the main influence factors.In the analysis of influencing factors on the basis of landslide, screening indexes of landslide hazard evaluation,then creating a landslide hazard evaluation index system, select geological lithology, geological structure, topography, slope, elevation, rainfall, peak ground acceleration, land use types and human engineering activities as a major development impact indicators landslide hazard.In the work, based on the use of gis, fuzzy comprehensive evaluation of quantitative evaluation model, using AHP to determine the rights of the evaluation index weight of landslide hazards in the study area were risk evaluation, to achieve a landslide disaster hazard zonation. Final papers will be in accordance with the degree of risk of landslides in the study area is divided into four levels, namely that is a very low risk of landslide disaster area, the low risk of landslide hazard areas, landslide hazard areas and the risk of landslide hazards in high-risk areas. High risk of landslide disaster which mainly distributed in the hilly area of north-south, northwest of low Zhongshan region landslide disaster risk areas are mainly located in the north-south border Mianxian low Zhongshan region, as well as low in the middle of the mountains, and landslide disaster-prone areas with high o low risk of landslide disaster area mainly in the northern low in the mountains, in the junction-prone areas very low risk of landslide disaster area is mainly basin area, the region is mainly inhabited areas, flat, easy landslide disasters.