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DOI | 10.1029/2018WR024470 |
How Dynamic Boundary Conditions Induce Solute Trapping and Quasi-stagnant Zones in Laboratory Experiments Comprising Unsaturated Heterogeneous Porous Media | |
Cremer, C. J. M.; Neuweiler, I. | |
2019-12-13 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:12页码:10765-10780 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | The vadose zone is subject to dynamic boundary conditions in the form of infiltration and evaporation. A better understanding of implications for flow and solute transport, arising from these dynamic boundary conditions in combination with heterogeneous structure, will help to improve the prediction of the fate of solutes. We present laboratory experiments and numerical simulations of heterogeneous porous media under unsaturated conditions where controlled, temporally varying precipitation and evaporation are applied to study the effect of dynamic boundary conditions on solute transport in the presence of material interfaces. Dye tracers Eosine Y and Brilliant Blue FCF are utilized to visualize solute transport and analyze redistribution processes in a flow cell. Water and solute fluxes in and out of the flow cell are quantified. While in dynamic experiments application of small infiltration rates (significantly below the saturated hydraulic conductivities of the materials) led to a reversal of transport paths between infiltration and succeeding evaporation, larger infiltration rates altered downward transport such that flow and transport paths differed from those observed during evaporation. Differences in transport paths ultimately led to a redistribution and trapping of solute in one material which manifested as pronounced tailing in breakthrough curves. Trapping was induced not by the formation of a stagnant zone as result of large parameter contrast but by an interplay of dynamic boundary conditions and material heterogeneity. This study thereby highlights the importance to consider dynamic boundary conditions in predictions of solute leaching. |
英文关键词 | laboratory experiment unsaturated porous media conservative solute transport dynamic boundary conditions |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000502459300001 |
WOS关键词 | FLOW ; TRANSPORT ; WATER ; NONEQUILIBRIUM ; DISPERSION ; MOVEMENT ; BEHAVIOR |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/223984 |
专题 | 资源环境科学 |
作者单位 | Leibniz Univ Hannover, Inst Fluid Mech & Environm Phys Civil Engn, Hannover, Germany |
推荐引用方式 GB/T 7714 | Cremer, C. J. M.,Neuweiler, I.. How Dynamic Boundary Conditions Induce Solute Trapping and Quasi-stagnant Zones in Laboratory Experiments Comprising Unsaturated Heterogeneous Porous Media[J]. WATER RESOURCES RESEARCH,2019,55(12):10765-10780. |
APA | Cremer, C. J. M.,&Neuweiler, I..(2019).How Dynamic Boundary Conditions Induce Solute Trapping and Quasi-stagnant Zones in Laboratory Experiments Comprising Unsaturated Heterogeneous Porous Media.WATER RESOURCES RESEARCH,55(12),10765-10780. |
MLA | Cremer, C. J. M.,et al."How Dynamic Boundary Conditions Induce Solute Trapping and Quasi-stagnant Zones in Laboratory Experiments Comprising Unsaturated Heterogeneous Porous Media".WATER RESOURCES RESEARCH 55.12(2019):10765-10780. |
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