The Study Of Hazard Evaluation And Prevention About Geohazards For County Based On GIS

With the rapid development of human being's exploitation on mountainous basin areas, the geohazards in these areas have the much more influence on the existence and development of our society than ever. Therefore, it becomes more and more important to perform analysis and evaluation for these geohazards from the regional point of view, and to attempt to control and manage them to reduce their risk to our society. Take the project of the investigation and evaluation in Jiulong of Sichuan province for example, this paper has discussed the methods of evaluation the geohazards fatalness and the system of prevention and cure of the geohazards. Firstly, the nature conditions and general geological situations are introduced. The theory and methods of evaluation the geohazards fatalness are concluded briefly. Then, the general thought way for regional geohazards evaluation based on GIS is presented. The need of evaluation and the practical situations for the area being considered, the selection of evaluation factors needed in evaluation and the quantification methods for them are discussed. Then the evaluation layers for the need of the statistic and information content method were managed , then gave a adding analysis to the evaluation factors and reclassified the evaluation results. At last the evaluation map of the area's geohazards fatalness were gained.The prevention area map of the research area was gained at the basis of the evaluation map of the area's geohazards fatalness. Then prevention system of the geohazards was constructed.