Research On Monitoring Technology Of Soil Pollutant Transport Based On Resistivity Method

There are different degrees of leakage in landfills.Monitoring the movement of landfill leachate in soil can provide important basic data for environmental treatment.In this paper,theoretical research,numerical simulation,physical model experiment comparison analysis and other methods are used to study the migration and diffusion of pollutants in the formation and the dynamic monitoring technology of resistivity method.Firstly,theoretically,the pollutant migration and diffusion law and the resistivity method monitoring technology are studied,and the differential equation of pollutant transport and diffusion is established.Secondly,based on the Archie formula,the relationship between dielectric resistivity and solute concentration at any time is derived,which provides a theoretical basis for the study of pollutant transport process by resistivity method.Then,the numerical simulation of the contaminant transport process is carried out,and the migration and diffusion laws are summarized.Then the calculated concentration data is converted into resistivity data using the solution concentration and resistivity formula to form the initial model of resistivity distribution.Obtained apparent resistivity monitoring data.Combined with the concentration and the calculated distribution of apparent resistivity with time,it can be seen that the apparent resistivity distribution and the concentration distribution can correspond oneto-one.It is verified that the resistivity method can effectively monitor the migration and diffusion process of soil pollutants.By comparing and analyzing the results of different porosity and different seepage strength models,it can be seen that under other conditions of constant hydrogeological conditions,the increase of porosity will reduce the diffusion rate of pollutants;the increase of seepage strength will lead to the early stage of pollutant diffusion.The speed of the impact is greater,but has little effect on the later period.In the physical model experiment process,the seepage simulation was carried out on the surface of the model,and the three-dimensional DC resistivity method was used to monitor the diffusion process of the pollutants for 24 hours.The experimental results show that it is basically consistent with the diffusion law of pollutant concentration,and it is found that the diffusion rate of pollutants preferentially increases in the water conduit.The results of physical experiments are basically consistent with the numerical simulation results,which confirms the validity and feasibility of the dynamic monitoring of soil contaminant transport and diffusion by resistivity method.The paper has 44 pictures,2 table,72 references.