| As the core factor of geological hazards, susceptibility evaluation have become the focus of the investigation of geological hazards in recent years.This time, taking the recognition of geological hazards of Jinning as a basispoint,and taking the susceptibility evaluation of geological hazards as the research baseline,advances to optimize popular susceptibility evaluation method of geological hazards further, and relies on MAPGIS software to build a fast stack-integration-evaluation system of geological hazards susceptibility, finally by comparing its results with the amount of information method' and fuzzy comprehensive evaluation method', come to accurate evaluation of the results and achieved on the rapid assessment and the traceabilityof geological hazards.Through this study, yielding the following results and understanding:(1) The survey verifies ninety five potentially geological hazards. Of these, sixty landslides, one collapse, two surface collapses, four debris blows and twenty eight unstable slopes in Jinning County.(2) Through systematic field investigation and laboratory research and analysis, it's known that geological hazards in Jinning is more growth, and the mainl geological hazards are landslides, unstable slopes,mud-rock flow, which has the character of the grouped and zonal distribution.(3) The lithology, rock composition and geologic structure in the region is the critical factors to affect the geological hazards growing extent, but atmospheric precipitation, human activities are a major induced factors of geological hazards, the roles of each factor in the process of occurrence of different geological hazards are different.(4) This sums up a evaluation system of geological hazards whose character is faster without losing accuracy-stack-integration-evaluation system of geological hazards. The specific evaluation process is as follows:①Select the key evaluation indicators; ②Using expert-delphi-technique to endow corresponding weight;To evaluate each index' susceptibility of the geological hazards, and to indicate the geological hazards'susceptibility by using three different colors, that eventually come to the zoning map of each index'susceptibility of the geological hazards;④Using MAPGIS spatial analysis to analyze the integration of overlay district map, and then to draw the total district map of geological hazard susceptibility;⑤Analysis of the results of the evaluation.(5) Tthe results of this evaluation system and the amount of information system's and the fuzzy evaluation system's of evaluation results were compared, the results are basically same, indicating that the evaluation system is reasonable, feasible, practical, operational and application value.(6) This method setted up in this evaluation system avoids effectively unexpectedness from dividing district, the expression from fusing color overlay has some gradual transition of the susceptibility of geological hazards.(7) This evaluation system, which simplifies the evaluation process of the traditional evaluation method, makes the evaluation process more directviewing and succinct, easier to operate, saves a lot of manpower, money and time for the evaluation of geological hazards, achieves better follow-up evaluation of geological hazards, and provides a scientific basis for disaster prevention and mitigation.(8) The evaluation results show that high-susceptibility regions of geological hazards in Jinning are mainly concentrated in the Xiyang town' western (Ⅰ1), Erjie river basin and Kunyang Phosphate peripheral (Ⅰ2), between the Liujie big river and the big river (Ⅰ3); mid-susceptibility regions center on the central region in Jinning (Ⅱ); This provides a direct basis for the prevention and cure planning of geological hazards in Jinning County. |
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