Research On Landslide Hazard Zonation Of Hanyuan County In Sichuan Province

Landslide is one of the most important types of natural disasters, with the characteristic of wide geographical distribution, high frequency, fast movement and serious losses. It is not only a threat to people’s lives and property, but also destructive of resources and the environment. It is imminent to enhance the risk of landslide hazard zonation study of theory and technology. This paper summarizes and analyzes regional landslide hazard assessment based on previous research, establishes the regional landslide hazard zonation model of Hanyuan County in Sichuan Province relying on the project of Geological Survey and analysis the study the area. The main conclusions of the paper are as follows.(1) Based on a wealth of actual data, The paper studys the geological environment of Hanyuan County in Sichuan Province, landslide hazard distribution and development law, establishes Hanyuan landslide hazard zonation Spatial Database, Sample points by analyzing the properties of landslide data obtained Hanyuan the distribution of landslides as well as the correlation between factors. Establish Hanyuan landslide hazard evaluation index system.(2) Select the regular grid as the evaluation unit, use the weight data-driven model to calculate the weight of impact factor of various different types of landslides. Compared with the expert knowledge model, determination the weights is more scientific and reliable, avoiding the subjectivity of the experts brought uncertainty.(3) Construct the information model of the weight of evidence model and the logistic regression model. Use the Mapgis platform and professional statistical analysis software for data exchange and zone the landslide hazard areas in Hanyuan County. Divide landslide hazard in Hanyuan into four grades, namely highly unstable, unstable, potentially unstable and stable. Three evaluation methods are verified mutually and the results coincide with the actual distribution of landslide.