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县城的快速发展日益受到地质灾害的显著制约,进行地质灾害危险性评价是县城可持续发展的客观需要。以甘肃省榆中县为例,建立了地质灾害危险性评价的3级模糊数学模型和全面详细的评价指标体系,查明了存在的主要地质灾害类型有滑坡、崩塌、泥石流及不稳定斜坡等,进行了地质灾害危险性3级模糊综合评价。结果表明,按照不易发、低易发、中易发和高易发4个级别,榆中县为地质灾害高易发区,该结果与实际情况较为一致。说明多级模糊综合法是实现地质灾害危险性评价由单因子定性评判过渡为多因子定量综合评判的有效途径。
The rapid development of the county seat is increasingly restricted by the geological disasters, and the assessment of the risk of geological disasters is an objective need for the sustainable development of the county. Taking Yuzhong County, Gansu Province as an example, a 3-level fuzzy mathematics model and a detailed evaluation index system for geohazard risk assessment are established. It is found that there are landslide, collapse, debris flow and unstable slope etc. , Conducted a three-level fuzzy comprehensive evaluation of geological hazard risk. The results showed that Yuzhong County is a high prone area with high geological disasters, which is not easy to be affected, low susceptible, moderate prone and high prone. The result is in good agreement with the actual situation. It shows that multi-level fuzzy synthesis method is an effective way to realize the transition from single-factor qualitative evaluation to multi-factor quantitative comprehensive evaluation for geological hazard risk assessment.