Risk Assessment And Division Of Geological Disasters In Zhaojue Based On GIS

This paper takes the geological disasters in Zhaojue County as the research object,and on the basis of comprehensively collecting the geological environment background and existing geological disaster data in the study area,analyzes the influencing factors,development characteristics and distribution rules of geological disasters in the study area,and selects the study area.Geological hazard risk evaluation index and evaluation model,based on GIS platform to carry out geological hazard risk evaluation in the study area.The main results are as follows:(1)Based on the field survey and remote sensing interpretation data analysis in Zhaojue County,the disaster-pregnancy environment and conditions of geological disasters in the region were identified,and the distribution,development characteristics and influencing factors of geological disasters in the region were analyzed,and 8 were selected.A hazard factor affecting the development of geological disasters in the study area was established,and a risk assessment index system for geological disasters in Zhaojue County was constructed.(2)Based on Arc GIS platform and SPSS software,the weight of evidence model,logistic regression model and the weight of evidence-logistic regression coupled model were used to evaluate the risk of the study area.The results of the three evaluation models were compared,and the ROC curve and AUC value were used to evaluate the accuracy.After verification,the model with the best accuracy was selected for geological hazard hazard zoning in Zhaojue County.(3)The comparison results show that the model with the highest accuracy among the three models of risk assessment in Zhaojue County is the weight of evidence-logistic regression coupled model,and its AUC value is 0.846.According to the results of the weight of evidence-logistic regression coupling model,the geological disaster risk zoning in Zhaojue County is divided into five levels from high to low: high,high,medium,low and low risk areas.Among them,there are 112 geological disasters in high,high and medium-risk areas,accounting for 81.75%,mainly distributed in Xincheng Town,Chengbei Township,Guqu Township and other areas,while the lower and lower risk areas have fewer geological disasters and are more threatening is small,consistent with the actual situation,the zoning results are ideal.