Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR019874 |
Forward and back diffusion through argillaceous formations | |
Yang, Minjune1; Annable, Michael D.2; Jawitz, James W.1 | |
2017-05-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The exchange of solutes between aquifers and lower-permeability argillaceous formations is of considerable interest for solute and contaminant fate and transport. We present a synthesis of analytical solutions for solute diffusion between aquifers and single aquitard systems, validated in well-controlled experiments, and applied to several data sets from laboratory and field-scale problems with diffusion time and length scales ranging from 10(-2) to 10(8) years and 10(-2) to 10(2) m. One-dimensional diffusion models were applied using the method of images to consider the general cases of a finite aquitard bounded by two aquifers at the top and bottom, or a semiinfinite aquitard bounded by an aquifer. The simpler semiinfinite equations are appropriate for all domains with dimensionless relative diffusion length, Z(D)<0.7. At dimensionless length scales above this threshold, application of semiinfinite equations to aquitards of finite thickness leads to increasing errors and solutions based on the method of images are required. Measured resident solute concentration profiles in aquitards and flux-averaged solute concentrations in surrounding aquifers were accurately modeled by appropriately accounting for generalized dynamic aquifer-aquitard boundary conditions, including concentration gradient reversals. Dimensionless diffusion length scales were used to illustrate the transferability of these relatively simple models to physical systems with dimensions that spanned 10 orders of magnitude. The results of this study offer guidance on the application of a simplified analytical approach to environmentally important layered problems with one or two diffusion interfaces. Plain Language Summary Groundwater contaminants may become temporarily trapped in low-permeability zones in the subsurface, but then reemerge into the groundwater later. We gathered data from laboratory and field-scale examples of this problem with time scales ranging from days to thousands of years and length scales ranging from centimeters to hundreds of meters. We then apply relatively straightforward mathematical relations to this very broad range of data to show that we can understand and predict the timescales of expected risk to groundwater systems. |
英文关键词 | application of analytical solution forward diffusion back diffusion aquitard DNAPL |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000403712100059 |
WOS关键词 | FRACTURED POROUS-MEDIA ; LOW-PERMEABILITY ZONES ; CONTAMINANT TRANSPORT ; SOLUTE TRANSPORT ; AQUITARD ; PROFILES ; PERSISTENCE ; AQUIFER ; SYSTEM ; CLAYS |
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/20100 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Florida, Soil & Water Sci Dept, Gainesville, FL 32611 USA; 2.Univ Florida, Dept Environm Engn Sci, Gainesville, FL 32611 USA |
推荐引用方式 GB/T 7714 | Yang, Minjune,Annable, Michael D.,Jawitz, James W.. Forward and back diffusion through argillaceous formations[J]. WATER RESOURCES RESEARCH,2017,53(5). |
APA | Yang, Minjune,Annable, Michael D.,&Jawitz, James W..(2017).Forward and back diffusion through argillaceous formations.WATER RESOURCES RESEARCH,53(5). |
MLA | Yang, Minjune,et al."Forward and back diffusion through argillaceous formations".WATER RESOURCES RESEARCH 53.5(2017). |
条目包含的文件 | 条目无相关文件。 |
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