贵阳市阅山湖地下水污染成因分析--以金牛泉为例

Genesis Analysis of Groundwater Pollution in Yueshan Lake of Guiyang,Taking the Jinliu Spring as an Example

阅山湖东南岸金牛泉自2019年4月以来曾发生多次污染事件,通过分析泉域范围内水文地质条件及对潜在污染源的排查,发现万达广场1号、3号排污管网存在污水渗漏现象,为明确金牛泉污染成因及污染物来源,采用高密度电法对万达广场与金牛泉之间碳酸盐岩地层中岩溶发育情况及富水状况进行探测,并采用地下水示踪试验对万达广场排污管网中污水的渗流去向加以验证,最终得知万达广场位于地下水径流带上,其下伏地层溶蚀裂隙、构造裂隙、溶洞等较为发育,为地下水向金牛泉径流提供了有利途径,1号、3号排污管网污水渗漏后,沿着溶蚀裂隙、构造裂隙等向金牛泉方向径流,最终造成了金牛泉地下水污染。

Jinniu Spring on the southeast bank of Yueshan Lake has suffered multiple pollution events since April 2019.Through the analysis of hydrogeological conditions within the spring area and the investigation of potential pollution sources,it is found that there is sewage leakage phenomenon in the No.1 and No.3 sewage pipe network of Wanda Square.In order to clarify the causes of pollution and the sources of pollutants of Jinniu Spring,the karst development and water-rich condition in carbonate strata between Wanda Square and Jinniu Spring were detected by high-density electrical method,and the seepage direction of sewage in the drainage pipe network of Wanda Square was verified by underground water tracing test.The results show that Wanda Square is located in the groundwater runoff belt,and the dissolution cracks,structural cracks and karst caves in the ground layer under it are relatively developed,which provides a favorable way for groundwater runoff to Jinniu Spring.After the sewage leakage of No.1 and No.3 sewage pipe network,the runoff along the dissolution fissure and structural fissure to the direction of Jinniu Spring,and finally caused the groundwater pollution of Jinniu Spring.