Ground Water

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Prediction of Diffusion Coefficients in Porous Media Using Tortuosity Factors Based on Interfacial Areas
Ground Water - Tập 40 Số 4 - Trang 346-352 - 2002
K. Prasad Saripalli, R.J. Serne, Philip D. Meyer, B. Peter McGrail
AbstractDetermination of aqueous phase diffusion coefficients of solutes through porous media is essential for understanding and modeling contaminant transport. Prediction of diffusion coefficients in both saturated and unsaturated zones requires knowledge of tortuosity and constrictivity factors. No methods are available for the direct measurement of these factors, which are empirical in their de... hiện toàn bộ
Three‐Dimensional Flow in the Storative Semiconfining Layers of a Leaky Aquifer
Ground Water - Tập 46 Số 1 - Trang 144-155 - 2008
Nicasio Sepúlveda
AbstractAn analytical solution for three‐dimensional (3D) flow in the storative semiconfining layers of a leaky aquifer fully penetrated by a production well is developed in this article to provide a method from which accurate hydraulic parameters in the semiconfining layers can be derived from aquifer test data. The analysis of synthetic aquifer test data with the 3D analytical solution in the se... hiện toàn bộ
The Value of Subsidence Data in Ground Water Model Calibration
Ground Water - Tập 46 Số 4 - Trang 538-550 - 2008
Tingting Yan, Thomas J. Burbey
AbstractThe accurate estimation of aquifer parameters such as transmissivity and specific storage is often an important objective during a ground water modeling investigation or aquifer resource evaluation. Parameter estimation is often accomplished with changes in hydraulic head data as the key and most abundant type of observation. The availability and accessibility of global positioning system ... hiện toàn bộ
Use of Solute and Isotopic Composition of Ground Water to Constrain the Ground Water Flow System of the Azraq Area, Jordan
Ground Water - Tập 36 Số 2 - Trang 361-365 - 1998
Nizar Abu-Jaber, Ali Jawad Ali, Khaldoon Al Qudah
AbstractThis study shows that hydrological systems in arid areas where water level data are incomplete can be better understood and constrained by using chemical and isotopic data. These constraints significantly alter the conceptual hydrological model of the Azraq area.Previous studies, based on water level data, suggest that water in the Azraq oasis is derived from two major piezometric highs; t... hiện toàn bộ
The Influence of Waterflood Design on the Recovery of Mobile DNAPLs
Ground Water - Tập 36 Số 2 - Trang 283-292 - 1998
Jason I. Gerhard, Bernard H. Kueper, Gary R. Hecox
AbstractThis study examines the effectiveness of various waterflooding strategies to recover pooled dense nonaqueous phase liquid (DNAPL) from the subsurface at an industrial facility. The relative influence of horizontal injection/recovery well configuration, established hydraulic gradient, and fluid properties is investigated for a site characterized by a homogeneous silty sand underlain by an i... hiện toàn bộ
Observed Migration of a Controlled DNAPL Release by Geophysical Methods
Ground Water - Tập 33 Số 6 - Trang 977-987 - 1995
Michael L. Brewster, A. P. Annan, John P. Greenhouse, B. H. Kueper, Gary R. Olhoeft, J. D. Redman, K. A. Sander
AbstractSeven hundred seventy liters of a dense nonaqueous phase liquid (DNAPL), tetrachloroethylene (PCE), were released into an isolated volume of a completely saturated natural sandy aquifer. The release was monitored over a period of 984 hours with a variety of geophysical methods including ground penetrating radar, time domain reflectometry, in situ resistivity, and a neutron soil moisture pr... hiện toàn bộ
A Field Experiment to Study the Behavior of Tetrachloroethylene Below the Water Table: Spatial Distribution of Residual and Pooled DNAPL
Ground Water - Tập 31 Số 5 - Trang 756-766 - 1993
Bernard H. Kueper, David Redman, Robert Starr, Stanley Reitsma, May Mah
AbstractThis paper describes a field experiment involving the release of 230.9 liters of tetrachloroethylene (PCE) below the water table in a naturally occurring, unconfined sand aquifer. The release was executed in a 3 m X 3 m X 3.4 m deep, scalable‐joint steel sheet‐pile cell anchored into an underlying clay aquitard. After allowing 28 days for redistribution, excavation of the upper approximate... hiện toàn bộ
Ground Water Age and Nitrate Distribution Within a Glacial Aquifer Beneath a Thick Unsaturated Zone
Ground Water - Tập 36 Số 1 - Trang 171-180 - 1998
Craig Johnston, Peter G. Cook, Shaun K. Frape, L. Niel Plummer, Eurybiades Busenberg, Ray J. Blackport
AbstractThe impact on ground water quality from increasing fertilizer application rates over the past 40 years is evaluated within a glacial aquifer system beneath a thick unsaturated zone. Ground water ages within the aquifer could not be accurately determined from the measured distribution of 3H and as a result, chlorofluorocarbon (CFC) and 3H/3He dating techniques were applied. Beneath a 25 m t... hiện toàn bộ
Tritium as an Indicator of Ground‐Water Age in Centrai Wisconsin
Ground Water - Tập 29 Số 3 - Trang 398-404 - 1991
Kenneth R. Bradbury
AbstractIn regions where ground water is generally younger than about 30 years, developing the tritium input history of an area for comparison with the current tritium content of ground water allows quantitative estimates of minimum ground‐water age. The tritium input history for central Wisconsin has been constructed using precipitation tritium measured at Madison, Wisconsin and elsewhere. Weight... hiện toàn bộ
Lower Groundwater 14C Age by Atmospheric CO2 Uptake During Sampling and Analysis
Ground Water - Tập 52 Số 1 - Trang 20-24 - 2014
Pradeep Aggarwal, Luis Araguás‐Araguás, Manzoor Ahmad Choudhry, M. van Duren, K. Froehlich
AbstractUptake of atmospheric CO2 during sample collection and analysis, and consequent lowering of estimated ages, has rarely been considered in radiocarbon dating of groundwater. Using field and laboratory experiments, we show that atmospheric CO2 can be easily and rapidly absorbed in hyperalkaline solutions used for the extraction of dissolved inorganic carbon, resulting in elevated 14C measure... hiện toàn bộ
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