Study On The Application Of Spatial Analysis Process In The Evaluation Of Geological Hazards Of Changxing Islang

With frequenting and severing geological disasters,how to effective forecasting and prevention of geological disasters become an urgent problem to minimize geological work of geological disasters.In recent years,geological disaster-prone evaluation is a core element of geological hazard assessment of planning research to geological disasters.In this paper,on the basis of Changxing Island of geological disaster investigation and division project and using spatial analysis methods of geological disaster prone to evaluate which based on a GIS(MAPGIS)platform technology.Firstly,it were comprehensive analysis on the geologic environment of the study area.Constructing the evaluation system of geological hazards,through the research on the actual materials and the factors to select the contribution of the geological disasters.Selection of grid cell as the evaluation unit,which collapse evaluation factors are topography,lithology,structure,human activities and geological disasters in the status,the landslide evaluation factors for topography,slope type,lithology,structure,rainfall,human activities and disaster situation.Secondly,using MAPGIS and establishing the mathematical model of the combined.And the two schemes are compared and analyzed,which actual case conditions selected information model and based on AHP and entropy value method,the fuzzy comprehensive evaluation model as the Changxing Island geological hazard assessment model.For evaluation index weights are determined by AHP and entropy value method combining subjective and objective weight determination method,which is using efficacy coefficient change the subjective weight value combined with objective weight values,expert subjective judgment and experience with the objective information combined with better scientific rationality.Finally,according to the evaluation results of the zoning map in study area and geological disasters in the study area were prone area;based on have been investigated that the distribution of geological disasters in the study area,comparison of the results of the above two methods of income,in with the actual situation is the most fit method is derived and the situation of study area evaluation and puts forward the reasonable disaster prevention and control measures.