砂箱模型中溶质运移过程的二维电阻率成像法监测
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摘要
为了解溶质在含水层中的运移过程和规律,在室内建立二维砂槽模型,以Na Cl溶液为溶质代表,采用电阻率成像的方法监测溶质运移过程。研究发现:在稳定流条件下,Na Cl溶液沿水流的方向移动距离较大;在垂直方向上主要受水动力弥散和重力的作用,随着试验的进行逐步向下扩散;低阻区沿水流方向的移动速度比垂直方向的入渗速度快。由电阻率图像可以清晰地看出咸淡界面的迁移过程,说明应用电阻率成像法监测溶质运移过程是有效的,为地下水中溶质运移过程的研究提供了一种新的可视化手段,为求取地下水流速和水动力弥散系数奠定了基础。
In order to understand the process and regularity of solute migration in aquifer,a two-dimensional sand trough model is established and the NaCl solution is represented for monitoring the solute transport process by resistivity imaging. The experimental results show that the Na Cl solution moves forward in the direction of the steady water flow. At the same time,in the vertical direction,mainly by the hydrodynamic dispersion,the role of gravity gradually diffuse downward in the test. The low resistance region moves faster than the vertical infiltration rate along the flow direction. The resistivity image can clearly show the migration process of brackish interface,and proves that the application of resistivity tomography is effective in monitoring solute transport and provides a new visualization method for the study of solute transport in groundwater,which lays the foundation for the determination of the velocity and hydrodynamic dispersion coefficientof groundwater.
In order to understand the process and regularity of solute migration in aquifer,a two-dimensional sand trough model is established and the NaCl solution is represented for monitoring the solute transport process by resistivity imaging. The experimental results show that the Na Cl solution moves forward in the direction of the steady water flow. At the same time,in the vertical direction,mainly by the hydrodynamic dispersion,the role of gravity gradually diffuse downward in the test. The low resistance region moves faster than the vertical infiltration rate along the flow direction. The resistivity image can clearly show the migration process of brackish interface,and proves that the application of resistivity tomography is effective in monitoring solute transport and provides a new visualization method for the study of solute transport in groundwater,which lays the foundation for the determination of the velocity and hydrodynamic dispersion coefficientof groundwater.
引文
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[2]王树芳,王丽亚,王晓红,等.溶质迁移模型在地下水有机污染源识别中的应用[J].环境科学,2012,33(3):760-770.
[3]郭延明.电阻率法在鲁南水资源勘查中的研究与应用[D].成都:成都理工大学,2012.
[4]刘国华,王振宇,黄建平.土的电阻率特性及其工程应用研究[J].岩土工程学报,2004,26(1):83-87.
[5]徐速,周启友,刘汉乐.ERT法在树干水分运移监测中的运用[J].桂林工学院学报,2006,26(3):347-352.
[6]Calamita G,Brocca L,Perrone A,et al.Electrical resistivity and TDR methods for soil moisture estimation in central Italy test-sites[J].Journal of Hydrology,2012,454-455:101-112.
[7]Hermans T,Vandenbohede A,Lebbe L,et al.Imaging artificial salt water infiltration using electrical resistivity tomography constrained by geostaistical data[J].Journal of Hydrology,2012,438-439:168-180.
[8]Vaudelet P,Schmutz M,Pesssel M,et al.Mapping of contaminant plumes with geoelectrical methods:a case study in urban context[J].Journal of Applied Geophysics,2011,75(4):738-751.
[9]Samouelian A,Cousin I,Tabbagh A,et al.Electrical resistivity survey in soil science:a review[J].Soil and Tillage Research,2005,83(2):173-193.
[10]Singha K,Gorelick S M.Saline tracer visualized with threedimensional electrical resistivity tomography:field-scale spatial moment analysis[J].Water Resources Research,2005,41(5):W05023,DOI:10.1029/2004WR003460.
[11]Oledenborger G A,Routh P S,Knoll M D.Sensitivity of electrical resistivity tomography data to electrode position errors[J].Geophysical Journal International,2005,163(1):1-9.
[12]杨海,葛良全,罗耀耀,等.高密度电法在茶园沟填埋场选址中的应用[J].地球物理学进展,2014,29(1):447-451.
[13]王玉玲,能昌信,王彦文,等.重金属污染场地电阻率法探测数值模拟及应用研究[J].环境科学,2013,34(5):1908-1914.
[14]刘庭发,聂艳侠,胡黎明,等.基于高密度电阻率法的水分迁移模型试验研究[J].岩土工程学报,2016,38(4):761-768.
[15]潘玉英,贾永刚,郭磊,等.LNAPL在砂质含水层中动态迁移的电阻率法监测试验研究[J].环境科学,2012,33(5):1744-1752.
[16]刘汉乐,张闪.非均质多孔介质中LNAPL污染过程的高密度电阻率成像法监测[J].地球物理学进展,2014,29(5):2401-2406.
[17]刘汉乐,周启友,陈余道.多孔介质中轻非水相液体污染物多相流体系的电阻率特性试验研究[J].环境污染与防治,2010,32(2):23-28.
[18]周蜜,王建国,黄松波,等.土壤电阻率测量影响因素的试验研究[J].岩土力学,2011,32(11):3269-3275.