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Ground water
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- Author:
- Bailey, Ryan T.; Morway, Eric D.; Niswonger, Richard G.; Gates, Timothy K.
- Source:
- Ground water 2013 v.51 no.5 pp. 752-761
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; chemical reactions; chemical speciation; groundwater; mathematical models; porous media; reaction kinetics; solutes; Show all 8 Subjects- Abstract:
- ... A numerical model was developed that is capable of simulating multispecies reactive solute transport in variably saturated porous media. This model consists of a modified version of the reactive transport model RT3D (Reactive Transport in 3 Dimensions) that is linked to the Unsaturated‐Zone Flow (UZF1) package and MODFLOW. Referred to as UZF‐RT3D, the model is tested against published analytical b ...
- DOI:
- 10.1111/j.1745-6584.2012.01009.x
- PubMed:
- 23131109
- http://dx.doi.org/10.1111/j.1745-6584.2012.01009.x

- Author:
- Gribb, M.M.; Sewell, G.
- Source:
- Ground water 1998 v.36 no.2 pp. 366-372
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; groundwater flow; computer software; simulation models; mathematical models; equations; solutes; Show all 7 Subjects- Abstract:
- ... Increasingly, ground water hydrologists and engineers must solve saturated/unsaturated flow and transport problems. The unsaturated component of flow is especially important when considering transport of contaminants that originate from surface or near-surface sources such as waste spill sites, landfills, and hazardous waste storage sites. Numerical solution of such problems has been accomplished ...
- DOI:
- 10.1111/j.1745-6584.1998.tb01102.x
- http://dx.doi.org/10.1111/j.1745-6584.1998.tb01102.x

### 3. Significance of unsaturated flow and seepage faces in the simulation of steady-state subsurface flow

- Author:
- Romano, C.G.; Frind, E.O.; Rudolph, D.L.
- Source:
- Ground water 1999 v.37 no.4 pp. 625-632
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; seepage; groundwater flow; saturated flow; simulation models; aquifers; mathematical models; unsaturated hydraulic conductivity; groundwater recharge; streams; Show all 10 Subjects- Abstract:
- ... A fully saturated, free-surface ground water flow model and a variably saturated model are applied to the solution of the free-surface ground water flow problem in order to determine the influence of the unsaturated flow component on the accuracy of the saturated flow solution and the water balance for homogeneous systems. The significance of the seepage face that must exist to provide a transitio ...
- DOI:
- 10.1111/j.1745-6584.1999.tb01151.x
- http://dx.doi.org/10.1111/j.1745-6584.1999.tb01151.x

- Author:
- Moench, A.F.
- Source:
- Ground water 1995 v.33 no.3 pp. 378-384
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; groundwater flow; aquifers; wells; equations; mathematical models; saturated flow; water table; Show all 8 Subjects- Abstract:
- ... A Laplace transform solution is presented for flow to a well in a homogeneous, water-table aquifer with noninstantaneous drainage of water from the zone above the water table. The Boulton convolution integral is combined with Darcy's law and used as an upper boundary condition to replace the condition used by Neuman. Boulton's integral derives from the assumption that water drained from the unsatu ...
- DOI:
- 10.1111/j.1745-6584.1995.tb00293.x
- http://dx.doi.org/10.1111/j.1745-6584.1995.tb00293.x

- Author:
- Nachabe, M.H.; Islas, A.L.; Illangasekare, T.H.
- Source:
- Ground water 1995 v.33 no.2 pp. 304-310
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; soil water movement; equations; pollutants; mathematical models; unsaturated hydraulic conductivity; mathematics and statistics; solutes; Show all 8 Subjects- Abstract:
- ... Analytical solutions for the water flow and solute transport equations in the unsaturated zone are presented. We use the Broadbridge and White nonlinear model to solve the Richards' equation for vertical flow under a constant infiltration rate. Then we extend the water flow solution and develop an exact parametric solution for the advection-dispersion equation. The method of characteristics is ado ...
- DOI:
- 10.1111/j.1745-6584.1995.tb00285.x
- http://dx.doi.org/10.1111/j.1745-6584.1995.tb00285.x

- Author:
- Mace, A.; Rudolph, D.L.; Kachanoski, R.G.
- Source:
- Ground water 1998 v.36 no.3 pp. 465-475
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; unsaturated hydraulic conductivity; soil water retention; sand; gravel; soil water content; glacial deposits; saturated flow; mathematical models; Massachusetts; Show all 10 Subjects- Abstract:
- ... The performance of parametric models used to describe soil water retention (SWR) properties and predict unsaturated hydraulic conductivity (K) as a function of volumetric water content (theta) is examined using SWR and K(theta) data for coarse sand and gravel sediments. Six 70 cm long, 10 cm diameter cores of glacial outwash were instrumental at eight depths with porous cup tensiometers and time d ...
- DOI:
- 10.1111/j.1745-6584.1998.tb02818.x
- http://dx.doi.org/10.1111/j.1745-6584.1998.tb02818.x

- Author:
- Lee, S.; McAvoy, D.C.; Szydlik, J.; Schnoor, J.L.
- Source:
- Ground water 1998 v.36 no.1 pp. 123-132
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; laundry products; dicarboxylic acids; mathematical models; biodegradation; septic systems; saturated flow; groundwater flow; equations; phosphates; Ontario; Show all 11 Subjects- Abstract:
- ... A mathematical model was developed for the purpose of predicting the fate and transport of down-the-drain household chemicals in septic systems. The model was tested with field data collected from a typical septic system located near Cambridge, Ontario, Canada. Model simulations were in good agreement with field data for the laundry detergent builders tartrate monosuccinate (TMS) and tartrate diss ...
- DOI:
- 10.1111/j.1745-6584.1998.tb01072.x
- http://dx.doi.org/10.1111/j.1745-6584.1998.tb01072.x

### 8. Subsurface stormflow modeling with sensitivity analysis using a Latin-hypercube sampling technique

- Author:
- Gwo, J.P.; Toran, L.E.; Morris, M.D.; Wilson, G.V.
- Source:
- Ground water 1996 v.34 no.5 pp. 811-818
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; radionuclides; storms; rain; subsurface flow; mathematical models; simulation models; equations; saturated hydraulic conductivity; saturated flow; groundwater flow; Show all 11 Subjects- Abstract:
- ... During storm events, the shallow disposal facilities at Oak Ridge National Laboratory become inundated, and subsurface stormflow may intermittently extract radionuclides from the surrounding soils and the wastes themselves. It is estimated that 90% of the rain water infiltrating the soil horizons becomes subsurface stormflow, yet stormflow is a poorly understood process. The objectives of this res ...
- DOI:
- 10.1111/j.1745-6584.1996.tb02075.x
- http://dx.doi.org/10.1111/j.1745-6584.1996.tb02075.x

- Author:
- Falta, R.W.
- Source:
- Ground water 1995 v.33 no.2 pp. 235-246
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; polluted soils; soil pollution; air flow; gases; gas exchange; extraction; pollutants; volatile compounds; soil air; mathematical models; vapors; Show all 12 Subjects- Abstract:
- ... Analytical solutions are developed for modeling the transient and steady-state gas pressure and the steady-state streamfunction fields resulting from gas injection and extraction from a pair of parallel horizontal wells. These solutions apply to cases in which the ground surface is open to the atmosphere, and in which the porous media is anisotropic but homogeneous. By neglecting end effects due t ...
- DOI:
- 10.1111/j.1745-6584.1995.tb00278.x
- http://dx.doi.org/10.1111/j.1745-6584.1995.tb00278.x

- Author:
- Waddill, D.W.; Parker, J.C.
- Source:
- Ground water 1997 v.35 no.6 pp. 938-947
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; aquifers; groundwater contamination; petroleum; sandy loam soils; spatial variation; saturated hydraulic conductivity; saturated flow; simulation models; mathematical models; groundwater flow; wells; soil physical properties; water purification; Show all 14 Subjects- Abstract:
- ... A multiphase flow model (ARMOS) was used to evaluate the effects of subsurface heterogeneities on the recover of light, nonaqueous phase liquids (LNAPLs or simply "oil"). Stochastic inputs for the model included the saturated hydraulic conductivity (Ksw), van Genuchten alpha and n, the water saturation at field capacity (Sm), and the maximum residual oil saturations in the saturated (Sor) and the ...
- DOI:
- 10.1111/j.1745-6584.1997.tb00165.x
- http://dx.doi.org/10.1111/j.1745-6584.1997.tb00165.x

- Author:
- Amokrane, H.; Villeneuve, J.P.
- Source:
- Ground water 1996 v.34 no.4 pp. 666-674
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; equations; rain; evaporation; evapotranspiration; plants; water uptake; soil water movement; mathematical models; unsaturated hydraulic conductivity; soil water potential; soil water content; porous media; Show all 13 Subjects- Abstract:
- ... A numerical procedure based on the MacCormack method was used for the simulation of one-dimensional isothermal transient movement of liquid phase water in an unsaturated soil including precipitation, evaporation, and moisture removal from soil by the roots of transpiring plants. The numerical model utilized finite-difference explicit predictor-corrector equations and it was applied to a few flow p ...
- DOI:
- 10.1111/j.1745-6584.1996.tb02054.x
- http://dx.doi.org/10.1111/j.1745-6584.1996.tb02054.x

- Author:
- Akindunni, F.F.; Gillham, R.W.; Conant, B. Jr.; Franz, T.
- Source:
- Ground water 1995 v.33 no.2 pp. 264-274
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; groundwater contamination; aquifers; pollutants; saturated flow; groundwater flow; wells; simulation models; mathematical models; equations; saturated hydraulic conductivity; fluid mechanics; Show all 12 Subjects- Abstract:
- ... A transient axisymmetric saturated-unsaturated numerical flow model was coupled with a particle tracking model to investigate the movement of contaminants when a shallow unconfined aquifer is pumped at a constant rate. The particle tracking model keeps track of locations and masses of solutes in the aquifer, and the time of capture by the well. At the end of each time-step the flow model solves th ...
- DOI:
- 10.1111/j.1745-6584.1995.tb00281.x
- http://dx.doi.org/10.1111/j.1745-6584.1995.tb00281.x

- Author:
- Boateng, S.; Cawlfield, J.D.
- Source:
- Ground water 1999 v.37 no.2 pp. 185-193
- ISSN:
- 0017-467X
- Subject:
**unsaturated****flow**, etc ; soil pollution; pollutants; algorithms; mathematical models; unsaturated hydraulic conductivity; simulation models; sand; clay loam soils; sandy soils; soil water retention; soil water content; probability analysis; loamy sand soils; Show all 14 Subjects- Abstract:
- ... A two-dimensional probabilistic transport model is developed by coupling a reliability algorithm to a two-dimensional unsaturated flow and transport model. The goal is to determine the significance of the uncertainty of each variable to the probability outcome. Model input includes the mean, standard deviation, and probability distribution of each uncertain variable. The uncertain variables are as ...
- DOI:
- 10.1111/j.1745-6584.1999.tb00973.x
- http://dx.doi.org/10.1111/j.1745-6584.1999.tb00973.x

- Author:
- Bouwer, Herman
- Source:
- Ground water 1964 v.2 no.3 pp. 26
- Subject:
**unsaturated****flow**, etc ; groundwater flow; water table; aquifers; hydrodynamics; saturated flow; mathematical models; simulation models; Show all 8 Subjects- Abstract:
- ... Resistance network analogs (R-analogs) permit solution of ground-water flow systems in media that may be uniform or non-uniform, isotropic or anisotropic, and saturated or unsaturated. Two-dimensional as well as axisymmetric systems can be represented on the analog and complex boundary conditions can easily be simulated. Only steady-state systems can be analyzed with the R-analog. However, systems ...
- Handle:
- 10113/50434
- DOI:
- 10.1111/j.1745-6584.1964.tb01769.x
- http://dx.doi.org/10.1111/j.1745-6584.1964.tb01769.x