Research On Geo-hazard Risk Zoning Of Zhongyuan City Group

Zhongyuan City Group are situated in geo-hazards prone areas. In light of the geo-environment, the dominant features concerning the geo-hazards there, such as their distribution pattern, intensity of occurrence and activity, degree of threatening and sabotage ,etc., four kinds of geo-hazards( collapse ,landslide ,debris flow and subsidence ) are chosen in this geo-hazards risk zoning research.Based on geological and geographical data obtained by means of field investigation and RS technology, analyze the constitution of geo-hazards, determine the hierarchy and logical order of congregate; based on the risk evaluation system developed on the platform of GIS, and division of evaluation units, use various evaluation models(fuzzy synthetic discrimination, analytic hierarchy process, extensible comprehensive evaluation model, artificial neural network) for comparison research, in order to find out the suitable model which can adequately describe the various relationships among them.Taking into account related factors, such as population ,housing and building ,life line engineering ,distribution of land resources, etc., the index system and model concerning vulnerability evaluation has been established.By overlapping the risk zoning results concerning the above four kinds of geo-hazards, a comprehensive risk zoning was carried out. dividing the area into five categories, ranging from zero risk to super high risk. Moreover ,some suggestions were put forward for the harness of geo-hazards in Zhongyuan City Group . the main innovation points include:1. It is the first time to conduct geo-hazard risk zoning research in such a large area of Zhongyuan City Group, some exploration and innovations were made in aspects like profundity, precision, zoning theory and techniques. In light of the domestic and abroad research achievements and techniques, and in accordance with the regional features concerning geo-hazard occurrence and threatening, social, economical conditions, a comprehensive geo-hzard evaluation system was established in conjunction with hazard and vulnerability for the first time, with the completing of geo-hazard risk evaluation zoning with high precision in such a large area. Therefore, the research further develop the geo-hazard risk zoning theory and techniques, enriched the geo-hazard assessment and zoning system consisting of hazard and vulnerability evaluation, and risk assessment, can serve as an model for other similar work.2. Produce an overall evaluation index system and evaluation model for the first time , instead of just overlapping risk values of single type geo-hazard one other simply. Then carry out the risk zoning of geo-hazards in Zhongyuan City Group.3.By applying GIS, Excel data base and RS successfully to the digitalization of evaluation maps(concerning hazard, vulnerability and risk), the overlapping of map vectors, calculation of attributes and map edition ,realize the digitalization ,modeling and dynamism of risk analysis and evaluation, ensuring the precision of risk research and shows an important breakthrough and development compared to traditional zoning work.