Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL072980 |
The role of uplift and erosion in the persistence of saline groundwater in the shallow subsurface | |
Yager, R. M.1; McCoy, K. J.2; Voss, C. I.3; Sanford, W. E.4; Winston, R. B.4 | |
2017-04-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | In many regions of the world, the shallow (<300 m) subsurface is replenished with meteoric recharge within a few centuries or millennia, but in some regions saline groundwater persists despite abundant rainfall. Analyses of the flushing rate of shallow groundwater usually consider the permeability and recharge rate and a static landscape. The influence of landscape evolution can become important over millions of years, however. Here we present numerical simulations of fluid flow and transport in the top 1 km of a sedimentary foreland basin dominated by aquitards, where the rate of uplift and erosion ( 20 m Ma(-1)) balances that of meteoric flushing. Paleozoic age saline groundwater and brine persist at shallow depths that might otherwise have contained potable water. Similar hydrogeologic conditions, and uplift and erosion rates, likely exist in many other regions of the world, where a moving landscape has probably never been considered as an important contributor to groundwater quality. Plain Language Summary Most people are unfamiliar with brine, but saline water more concentrated than seawater can be encountered nearly everywhere beneath the Earth's surface. Brines five to ten times more concentrated than seawater typically occur deep below the surface, but beneath the Appalachian Plateaus in the eastern United States, brine is within 300 m of the surface. This is surprising because the brine and the rocks within which it resides are quite old (more than 250 million years). Rainfall in this humid area should have flushed the brine from the rocks over this period. This study found that erosion plays a dominant role in this landscape, because the rate of erosion is comparable to the rate of flushing, so brine will persist as the surface continues to descend. This finding has implications to other areas in the world where similar geologic processes are at work, and has particular significance to the Appalachian Basin, where hydraulic fracturing of gas wells has raised concerns that injected fluids could migrate to land surface. Shallow brine in the Appalachian Plateaus provides a geologic barrier to the upward migration of injected fluids, because the density difference between brine and the injected fluid will impede its upward flow. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000401847500028 |
WOS关键词 | APPALACHIAN BASIN ; FLUID PRESSURES ; BRINE MIGRATION ; FLOW MODELS ; PENNSYLVANIA ; AQUIFERS ; COMPLEX ; ORIGIN ; RESISTIVITY ; MECHANISMS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/28692 |
专题 | 气候变化 |
作者单位 | 1.US Geol Survey, Troy, NY 12183 USA; 2.US Geol Survey, Richmond, VA USA; 3.US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA; 4.US Geol Survey, 959 Natl Ctr, Reston, VA 22092 USA |
推荐引用方式 GB/T 7714 | Yager, R. M.,McCoy, K. J.,Voss, C. I.,et al. The role of uplift and erosion in the persistence of saline groundwater in the shallow subsurface[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(8). |
APA | Yager, R. M.,McCoy, K. J.,Voss, C. I.,Sanford, W. E.,&Winston, R. B..(2017).The role of uplift and erosion in the persistence of saline groundwater in the shallow subsurface.GEOPHYSICAL RESEARCH LETTERS,44(8). |
MLA | Yager, R. M.,et al."The role of uplift and erosion in the persistence of saline groundwater in the shallow subsurface".GEOPHYSICAL RESEARCH LETTERS 44.8(2017). |
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