A Study On Risk Assessment About Geological Disasters And Hazard Prevention And Mitigation Measures Of FengJie In ChongQing

Geological disaster risks include the activity itself and the potential loss of human damage. It reflects the possible occurrence of geological disasters and the extent of the loss and destruction, Geological disasters are comprehensive reflection of natural attributes and the socio-economic attributes. This thesis according to the natural and human environment as well as the characteristics of geological disasters forming geological disasters in FengJie County, constructs a geological disasters model about the risk assessment, ArcGIS spatial analysis function is used in FengJie County's geological disaster risk evaluation results, and the actual distribution of geological disasters is used in the comparative analysis of testing results and the evaluation is proved reasonable. The full text includes six parts:The first part: The introduction. Introducing the significant background of this paper, the status quo in domestic and abroad as well as the major research studies couple with research methods.Next: The regional environment of FengJie. There are two aspects: the natural environment (geographical location, lithology, topography, climate, hydrology, hydrogeology, human activities, etc.) and socio-economic environment (agriculture, industry, transport, financial services, etc.).Subsequently: The main features of geological disasters divided in Feng jie. Including landslides, the collapse, Mud-rock flow and ground subsidence's disasters overview, distribution characteristics, and activities Features.Then: The risk assessment of geological disasters in FengJie . On the basis of risk assessment principles, it constructs the risk assessment model, including hazard assessment, vulnerability assessment and comprehensive risk assessment. Hazard assessment select the disaster points density, the scale of disaster, engineering rock-group, gradient, annual rainfall, vegetation coverage, distance of river the seven indicators and evaluation of its classification and quantified; Put several factors 'vector layer and the polygon as the basic evaluation unit of the assessment. Use AHP to determine the weight for every factor; According to H = W₁X₁ + W₂X₂ +…+ W_mX_m model, realize the hazard assessment in the ArcGIS (that is, attribute data integrated stack). Vulnerability assessment select the loss of life module, per capita income, the importance of regional and the infrastructure density as evaluation factors, put township administrative unit as a basic evaluation unit, use AHP to determine the weight for every factor; According to P = V₁Y₁ + V₂Y₂ +…+ V_nY_n model, realize the vulnerability assessment in the ArcGIS. On these basis, combined the results of the hazard and vulnerability assessment with the model R = 0.5×H+0.5×P to achieve risk assessment, then the actual distribution of geological disasters is used in the comparative analysis of testing results and the evaluation is proved reasonable.The fifth part: The disaster prevention and mitigation of geological disasters for FengJie. It provides the basic principles and the corresponding measures.The last part: The conclusions and discussion. This paper outlines the findings of this study and put forward the existing problems and shortcomings.