Assessment of susceptibility to karst collapse in the Qixia Zhongqiao district of Yantai based on fuzzy comprehensive method
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摘要: 在分析烟台市栖霞中桥区地质条件及岩溶塌陷产生条件的基础上,选择岩溶发育条件、构造条件、覆盖层条件、水文条件和人类活动条件共5个因子,构建层次型指标体系。同时为增加评价结果的客观性和准确性,选择采用模糊数学法构建各指标的隶属函数,并借助ArcGIS软件,最终实现对研究区岩溶塌陷灾害的易发性评价。分区评价结果表明:已发生岩溶塌陷点分布在岩溶塌陷的极易发生区和易发生区,说明本次评价分区具有合理性;对岩溶塌陷灾害极易发区和易发区应严格控制地下水的开采,以防止岩溶塌陷灾害的发生。Abstract: This work builds on investigations of geology and the conditions of karst collapse of the Qixia Zhongqiao District of Yantai. A hierarchical index system is established using 5 evaluation factors including karst development, structure, overburden bed, hydrogeology and human activities. In order to improve objectivity and accuracy of the evaluation, the memberships functions of every index are constructed to calculate the weight of the evaluation factors using fuzzy mathematical theory. In terms of ArcGIS, assessment of karst collapse susceptibility in the study area is achieved. The results show that all of existing collapses are located in the areas extremely susceptible and susceptible to karst collapse, indicating that the assessment is reasonable. To control the possibility of karst collapse in these areas, it is necessary to strictly control the exploitation of groundwater.
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Key words:
- karst collapse /
- index system /
- fuzzy mathematical method /
- susceptibility assessment
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