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《Progress in Geophysics》 2014-05
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Monitoring the process of LNAPL contaminant in heterogeneous porous media using Electrical Resistivity Tomography

LIU Han-le;ZHANG Shan;School of Environment Sciences and Engineering,Guilin University of Technology;Guangxi Scientific Experiment Center of Mining,Metallurgy and Environment,Guilin University of Technology;  
For the sake of monitoring the infiltration process of Light Non-Aqueous Phase Liquids(LNAPL)thoroughly and accurately in heterogeneous porous medium.In this paper,we have simulated LNAPL contaminant migration in threedimensional heterogeneous sand tank through indoor experiments,and obtained the variation images of the threedimensional resistivity value that change with the course of time with the help of the Electrical Resistivity Tomography(ERT)method.The experimental results show that the variation process of three-dimensional resistivity value that change with the course of time is able to clearly reflect LNAPL migration process in heterogeneous porous medium.In the horizontal direction,it is obvious that the shape of the center area which is contaminated by LNAPL can be seen as a circular approximately.As the increasing injecting quantity of LNAPL,the scope of contaminated area is increasing.Besides,the resistivity value of the center area is also increasing.In the vertical direction,LNAPL contaminated area can be seen as a semicircular at the beginning of the injection.However,when LNAPL approaches to the mutation surface of the media,the shape of the contaminated area changes from a semicircular to a semi-elliptical.That is to say,the lateral migration speed of LNAPL is greater than the vertical migration. This phenomenon has given a powerful evidence that the fine sand lens in the middle of the three-dimensional heterogeneous sand tank have played a role in blocking for the vertical migration of LNAPL.At the same time,the fine sand lens cause the lateral migration speed of LNAPL to incerase.From the variation images of the three-dimensional resistivity value that change with the course of time under the condition of heterogeneity which is obtained by Electrical Resistivity Tomography method,we can know that it is feasible and efficacious to apply Electrical Resistivity Tomography method to carrying out a three-dimensional dynamic monitoring experiment of LNAPL migration process in the heterogeneous porous media.
【Fund】: 国家自然科学基金(41102230);; 广西自然科学基金(2011GXNSFB018004);; 广西矿冶与环境科学实验中心(KH2012ZD004);; 广西危险废物处置产业化人才小高地联合资助
【CateGory Index】: P631.322
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