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DOI | 10.1002/2017WR021411 |
Fractional Models Simulating Non-Fickian Behavior in Four-Stage Single-Well Push-Pull Tests | |
Chen, Kewei1; Zhan, Hongbin1; Yang, Qiang2 | |
2017-11-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Four-stage single-well push-pull (SWPP) tracer tests, including injection, chasing, resting, and pumping, were conducted in a fractured aquifer at Newark basin. An anomalous transport phenomenon observed in the SWPP tests is the linear decline of breakthrough curves (BTCs) at late time with slope of -1.8 in log-log plots. A time-dependent fractional model is developed to interpret the anomalous transport behavior. This model considers a time-dependent power law memory function and a time-dependent fractional advection-dispersion operator. The fractional advection-dispersion equations (fADE) are solved in a radial coordinate system using the implicit Euler method. A semi-analytical solution of the first-order rate-limited mobile-immobile model (FORMIM) is derived for comparison. It is found that both the nonlocal transport in time and space can produce the long-tailed BTC. A smaller time-fractional or space-fractional index leads to a lower peak concentration and a larger late-time slope. The mass distribution of the fractional-in-space (FS) model exhibits power law decline at the leading plume edge. Early breakthrough during pumping is not observed because the mobile mass at the start of pumping is nonzero and more concentrated near the wellbore. The capacity ratio is an important factor that affects the peak concentration. A larger capacity ratio leads to greater peak concentration. A smaller time-fractional index in the injection, chasing, or resting stage will move the BTC downward and the slope of the late time BTC is determined by the space-fractional index over all stages and the time-fractional index in the pumping stage. The capability of the existing models to recover the BTC of the SWPP test is discussed and some guidelines for how to choose the appropriate model to interpret the SWPP test data are proposed. |
英文关键词 | fractional model non-Fickian single-well push-pull |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000418736700048 |
WOS关键词 | TRACER TESTS ; MASS-TRANSFER ; SOLUTE TRANSPORT ; TIME BEHAVIOR ; AQUIFER ; DISPERSION ; HETEROGENEITY ; DIFFUSION ; MEDIA ; FIELD |
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/21340 |
专题 | 资源环境科学 |
作者单位 | 1.Texas A&M Univ, Dept Geol & Geophys, College Stn, TX 77843 USA; 2.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA |
推荐引用方式 GB/T 7714 | Chen, Kewei,Zhan, Hongbin,Yang, Qiang. Fractional Models Simulating Non-Fickian Behavior in Four-Stage Single-Well Push-Pull Tests[J]. WATER RESOURCES RESEARCH,2017,53(11). |
APA | Chen, Kewei,Zhan, Hongbin,&Yang, Qiang.(2017).Fractional Models Simulating Non-Fickian Behavior in Four-Stage Single-Well Push-Pull Tests.WATER RESOURCES RESEARCH,53(11). |
MLA | Chen, Kewei,et al."Fractional Models Simulating Non-Fickian Behavior in Four-Stage Single-Well Push-Pull Tests".WATER RESOURCES RESEARCH 53.11(2017). |
条目包含的文件 | 条目无相关文件。 |
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