Application Research Of Resistivity Characteristic Method In Groundwater Resources Pollution And Prevention

Groundwater resources are the material basis for maintaining ecological balance and ensuring human survival.Compared with surface water,groundwater is protected by soil,rock formations,etc.,and can basically maintain good water quality.In recent years,due to the influence of human activities,the chemical composition,physical properties and biological characteristics of groundwater have changed,leading to groundwater pollution.As an interdisciplinary subject,geophysical technology has a wider range of applications due to its speed and accuracy.In recent years,the application of geophysical techniques in environmental geological surveys has become a hot research topic.Therefore,the use of geophysical techniques to study groundwater pollution,analysis of groundwater pollution,pollution levels and pollutant migration routes can be used for groundwater pollutant treatment.The work provides a theoretical basis.This paper mainly studies the simulation and application of high-density resistivity method for typical groundwater contaminated sites.On the basis of summarizing the basic principles of high-density resistivity method,RES2 DMOD software was used to calculate the changes of pollutants and resistivity under different simulated strata.The simulation analysis summarizes the anomalous characteristics of different occurrence pollution models and the differences between different resistivity models.On the basis of numerical simulation,a physical simulation experiment was designed to test the accuracy of numerical simulation results.The physical simulation uses a sandbox to simulate the actual formation method and measures the change in resistivity at different contaminant flow rates and contaminant concentrations.the study.The numerical simulation results show that for different pollutants,numerical simulation can accurately determine the spatial position of large,layered and similar fault pollutants in different simulated strata,but due to the difference of different equipment measurement methods,different pollution in the foreground map The effects of things are different.The Wenner ? and Wenner ? devices are less responsive to deep contaminants,while the Wenner ? device responds poorly to layered contaminants.For the resistivity of different pollutants,the forward simulation results have a good response to different resistivity pollutants in shallow formations.In deep formations,the Wenner beta device responded better than the Winner alpha device and Wenner gamma.device.The results of physical simulation studies show that under certain pollutant concentration conditions,the pollutants migrate along the water flow direction in the simulated formation along with the groundwater flow,and the speeds of the two are basically the same,which can be in the reverse part.The location of the contaminated space.As the mobility of contaminants decreases,some contaminants remain in the pores of the sandbox during migration,so the high-density resistivity method gradually increases the resistivity.When the groundwater flow rate is kept constant,the concentration of the pollutant changes.As the concentration of contaminants increases,the high-density resistivity method reacts more to the spatial position of the contaminants during this time.Based on the results of numerical simulation and physical simulation,the foundation of Jixian landfill was measured by high-density resistivity method.According to the research purpose,a total of 8 production lines were laid in the study area.Through the L1 and L8 lines,the internal space structure of the landfill and the landfill leachate migration channel of the landfill were found.The results show that there are many high and low resistance anomalies in the landfill,in which the low resistance anomaly is the landfill leachate enrichment area,the low resistance anomaly is the landfill leachate migration channel,and the high resistance anomaly is the unfilled area in the landfill or Unfilled area;in this area,the characteristics of the groundwater pollution inversion profile are determined by the L2,L3 and L4 lines,and the groundwater pollutant transport channel in this area is determined.In the unknown contaminated area,the south branch is determined by the L5,L6 and L7 lines.Groundwater migration path in the area.Through numerical simulation,physical simulation and actual test results comparison,the source of groundwater pollutants in the study area,migration channel and migration path were finally determined,which laid a foundation for local groundwater pollution control.