Investigation and pollution cause analysis of underground river pipeline in Zishuiquan,Guiyang City
Zishui spring is a natural dewpoint of karst groundwater and an important source of groundwater recharge in Yueshan Lake,Guiyang City,the water chemical quality of spring and the characteristics of underground river pipeline have a great impact on the water quality and ecological environment of Yueshan Lake.Based on the project"Yueshan Lake Groundw-ater Pollution and Hydro-geological survey",the development and hydro-chemical composition of underground river pipe-line in Zishui Spring were investigated in detail by means of tracer test,geophysical exploration and water quality test.The connection between the Zishui spring and the two upstream karst sinkholes was confirmed by the tracer test.According to the groundwater flow rate reflected by the tracer data and the karst morphology and scale investigation,the underground river in the northeast sinkhole(K02)was determined to be the main pipeline,with the fastest groundwater flow rate of 13.79m/h and the average flow rate of 7.21 m/h.The underground river where the north sinkhole(K03)is located is a branch pipeline,and the fastest flow rate of the groundwater is 5.12m/h,and the average flow rate is 4.65m/h.The extension direction of the main pipeline and the intensity of karst development nearby are further verified by high-density electrophysical exploration.Through the water quality test,it was found that the organic components dichloromethane exceeded the standard in Zishui spring,and trichloromethane,1,2-dichloroethane and 1,2-dichloropropane were detected.The contents of dichlorometh-ane,1,2-dichloroethane and trichloromethane,1,2-dichloropropane were significantly increased after the groundwater in Luoshui Hole(K02)was imported into the sewage of automobile 4S shop.It can be concluded that the pollution of the Zishui spring is caused by the leakage of production sewage from the automobile 4S shop into the underground river pipeline through the sinkhole(K02).It can provide some reference for investigation of organic pollution of underground river pipeline and groundwater in karst area.
Zishui springunderground river pipelinetracer testcause of pollution
NETL
NSTL
万方数据
