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Experimental study of conservative solute transport in heterogeneous aquifers
Zhao, Pingping1; Zhang, Xu1; Sun, Chengxing1; Wu, Jun2; Wu, Yanqing1
2017-06-01
Source PublicationENVIRONMENTAL EARTH SCIENCES
Volume76Issue:12
SubtypeArticle
AbstractAquifer heterogeneity affects the characteristics of solute breakthrough curves (BTCs). A better understanding of the relationship between aquifer heterogeneity and BTCs will help improve prediction of the fate of contaminants in an aquifer. Previous studies have shown that systematic research of aquifer heterogeneity on solute transport is limited. Therefore, this study investigates the impacts of aquifer heterogeneity on conservative solute BTCs and transport mechanism via experimental and modeling approaches. Tracer experiments are conducted in four flow-through columns exhibiting different patterns of heterogeneities. Furthermore, this study also examines the influence of hydraulic conductivity on transport mechanism. In addition, this paper analyses the correlation between hydraulic conductivity and dispersivity, which are the key parameters of conservative solute transport in an aquifer. Experimental data indicates the impacts of aquifer heterogeneity on transport of tracer. Tracer BTCs in a homogeneous aquifer have the typical sigmoid shape without tailing. In a heterogeneous aquifer, tracer BTCs display a strong and persistent tailing. In a preferential flow aquifer, tracer BTCs have pronounced tailing and early arrival time. The hydraulic conductivity of an aquifer significantly affects the transport mechanism of tracer. When the hydraulic conductivity is higher than 1.53 cm/min, transport of tracer is applicable to the ADE. When the hydraulic conductivity is lower than 1.53 cm/min, transport of tracer is applicable to the TRM. This work offers insight into the correlation between the hydraulic conductivity of an aquifer and the dispersivity of a conservative solute. A critical finding is that hydraulic conductivity K and dispersivity lambda correspond to an exponential regression form lambda = e (0.24555) + (4.54413K) + (2.27308K2) (R-2 = 0.957).
KeywordTracer Breakthrough Curves (Btcs) Advection-dispersion Equation (Ade) Two-region Model (Trm) Hydraulic Conductivity Dispersivity
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
WOS KeywordUNDISTURBED SOIL COLUMNS ; POROUS-MEDIA ; CONTAMINANT TRANSPORT ; REACTIVE TRANSPORT ; CHLORIDE TRANSPORT ; STRUCTURED SOILS ; TRACER TESTS ; SOLID-WASTE ; WATER ; FLOW
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology ; Geology ; Water Resources
WOS SubjectEnvironmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000404390900014
Citation statistics
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/6223
Collection青海盐湖研究所知识仓储
盐湖地质与环境实验室
Affiliation1.Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China
2.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Qinghai, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Pingping,Zhang, Xu,Sun, Chengxing,et al. Experimental study of conservative solute transport in heterogeneous aquifers[J]. ENVIRONMENTAL EARTH SCIENCES,2017,76(12).
APA Zhao, Pingping,Zhang, Xu,Sun, Chengxing,Wu, Jun,&Wu, Yanqing.(2017).Experimental study of conservative solute transport in heterogeneous aquifers.ENVIRONMENTAL EARTH SCIENCES,76(12).
MLA Zhao, Pingping,et al."Experimental study of conservative solute transport in heterogeneous aquifers".ENVIRONMENTAL EARTH SCIENCES 76.12(2017).
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