PubAg

Main content area

You searched for: Subject "unsaturated flow" Remove constraint Subject: "unsaturated flow" Journal Vadose zone journal Remove constraint Journal: Vadose zone journal Subject mathematical models Remove constraint Subject: mathematical models Subject vadose zone Remove constraint Subject: vadose zone Subject soil water movement Remove constraint Subject: soil water movement
Start Over

Search

11  Search Results

1 - 11 of 11
Number of results to display per page

Search Results

1. Comments on "A Set of Analytical Benchmarks to Test Numerical Models of Flow and Transport in Soils"

Author:
Groenendijk, P.; Kroes, J.G.; Dam, J.C. van
Source:
Vadose zone journal 2006 v.5 no.1 pp. 126-127
ISSN:
1539-1663
Subject:
unsaturated flow,   etc   ; vadose zone; soil water movement; mathematical models; hydrologic models; equations;     Show all 6 Subjects
DOI:
10.2136/vzj2005.0077L

2. Hydrologic behavior of unsaturated, fractured tuff: interpretation and modeling of a wellbore injection test

Author:
Robinson, B.A.; McLin, S.G.; Viswanathan, H.S.
Source:
Vadose zone journal 2005 v.4 no.3
ISSN:
1539-1663
Subject:
unsaturated flow,   etc   ; mathematical models; unsaturated conditions; hydrologic models; vadose zone; tuff; soil water movement; New Mexico;     Show all 8 Subjects
Abstract:
... A previously reported injection zone test in the Tshirege Member of the Bandelier tuff has been interpreted and modeled using a variety of conceptual models ranging from a single continuum model (SCM) to a dual permeability model (DKM). The agreement of the numerical models and the data was quite acceptable, both qualitatively and quantitatively. The migration of water injected in an open interval ...

3. A set of analytical benchmarks to test numerical models of flow and transport in soils

Author:
Vanderborght, J.; Kasteel, R.; Herbst, M.; Javaux, M.; Thiery, D.; Vanclooster, M.; Mouvet, C.; Vereecken, H.
Source:
Vadose zone journal 2005 v.4 no.1
ISSN:
1539-1663
Subject:
unsaturated flow,   etc   ; vadose zone; soil water movement; mathematical models; hydrologic models; equations;     Show all 6 Subjects
Abstract:
... Accurate model predictions of water flow and solute transport in unsaturated soils require a correct representation of relevant mechanisms in a mathematical model, as well as correct solutions of the mathematical equations. Because of the complexity of boundary conditions and the nonlinearity of the processes considered, general solutions of the mathematical equations rely on numerical approximati ...

4. Effective Hydraulic Properties Determined from Transient Unsaturated Flow in Anisotropic Soils

Author:
Ward, Andy L.; Zhang, Z. Fred
Source:
Vadose zone journal 2007 v.6 no.4 pp. 913-924
ISSN:
1539-1663
Subject:
unsaturated flow,   etc   ; saturated hydraulic conductivity; mathematical models; soil water content; infiltration (hydrology); vadose zone; soil water movement;     Show all 7 Subjects
Abstract:
... An important requirement for accurate modeling of field-scale unsaturated transport using local-scale parameters is a method to account for multiscale heterogeneity and the connectivity of the facies that control flow. A series of infiltration tests were conducted at the Hanford Site along a 60-m-long transect, instrumented at 1-m intervals to measure water content (θ) and capillary pressure head ...
DOI:
10.2136/vzj2006.0174

5. Flow in menisci corners of capillary rivulets

Author:
Dragila, M.I.; Weisbrod, N.
Source:
Vadose zone journal 2004 v.3 no.4
ISSN:
1539-1663
Subject:
unsaturated flow,   etc   ; mathematical models; capillarity; unsaturated conditions; porous media; vadose zone; soil water movement;     Show all 7 Subjects
Abstract:
... Liquids that flow in unsaturated rock fractures exhibit a range of behavior distinct from flow within the porous matrix. Flow patterns observed in laboratory experiments include aperture-spanning droplets, snapping and continuous capillary threads or rivulets, islands of local saturation, and fingering. Knowledge of the contact area and flow rate for each mode is necessary to achieve successful mo ...

6. Application of a Darcian approach to estimate liquid flux in a deep vadose zone

Author:
Hubbell, J.M.; Nicholl, M.J.; Sisson, J.B.; McElroy, D.L.
Source:
Vadose zone journal 2004 v.3 no.2
ISSN:
1539-1663
Subject:
unsaturated flow,   etc   ; mathematical models; waste disposal; equations; tensiometers; basalt; vadose zone; soil water movement; Idaho;     Show all 9 Subjects
Abstract:
... Approaches for estimating liquid flux in the shallow (0-2 m) vadose zone are hindered by the high degree of spatial and temporal variability present near the land surface. It is hypothesized that high-frequency variations in flux will be damped with depth. This study was conducted to estimate deep liquid flux using the Darcian approach at a waste disposal site in south-central Idaho that is underl ...

7. Adsorption-Desorption Processes in Subsurface Reactive Transport Modeling

Author:
Goldberg, S.; Criscenti, L.J.; Turner, D.R.; Davis, J.A.; Cantrell, K.J.
Source:
Vadose zone journal 2007 v.6 no.3 pp. 407
ISSN:
1539-1663
Subject:
unsaturated flow,   etc   ; soil pollution; vadose zone; aquifers; groundwater contamination; pollutants; adsorption; desorption; metal ions; radionuclides; geochemistry; mathematical models; chemical reactions; soil water movement; groundwater flow; saturated flow;     Show all 16 Subjects
Abstract:
... Adsorption-desorption reactions are important processes that affect the transport of contaminants in the environment. Various empirical approaches, such as the distribution coefficient and Freundlich and Langmuir isotherm equations, have been used to represent adsorption. The empirical approaches are not capable of accounting for the effects of variable chemical conditions, such as pH, on adsorpti ...
Handle:
10113/11109
DOI:
10.2136/vzj2006.0085

8. Evaluation of the conceptual flow model for a deep vadose zone system using advanced tensiometers

Author:
McElroy, D.L.; Hubbell, J.M.
Source:
Vadose zone journal 2004 v.3 no.1
ISSN:
1539-1663
Subject:
unsaturated flow,   etc   ; mathematical models; waste disposal; radionuclides; hazardous waste; equations; tensiometers; basalt; vadose zone; soil water movement; Idaho;     Show all 11 Subjects
Abstract:
... Conceptual flow models provide a framework for predictive modeling of contaminant transport. This study tests the assumptions of steady-state flow and a unit hydraulic gradient in a 177-m-thick vadose zone beneath a mixed waste site, using a network of advanced tensiometers. The conceptual flow model at the waste site, located on the Idaho National Engineering Laboratory (INEEL), describes moistur ...

9. Conceptual models of vadose zone flow and transport beneath the Pajarito Plateau, Los Alamos, New Mexico

Author:
Birdsell, K.H.; Newman, B.D.; Broxton, D.E.; Robinson, B.A.
Source:
Vadose zone journal 2005 v.4 no.3
ISSN:
1539-1663
Subject:
unsaturated flow,   etc   ; plateaus; mathematical models; groundwater recharge; hydrologic models; infiltration (hydrology); aquifers; canyons; vadose zone; tuff; soil water movement; New Mexico;     Show all 12 Subjects
Abstract:
... The Pajarito Plateau in northern New Mexico, on which the Los Alamos National Laboratory is situated, is characterized by a thick vadose zone overlying the regional aquifer of the western Espanola Basin. In this study, conceptual models of vadose zone flow and transport processes are presented and then supported through the interpretation of field data, including synthesis with numerical models. T ...

10. Transient flow in a heterogeneous vadose zone with uncertain parameters

Author:
Tartakovsky, A.M.; Garcia-Naranjo, L.; Tartakovsky, D.M.
Source:
Vadose zone journal 2004 v.3 no.1
ISSN:
1539-1663
Subject:
unsaturated flow,   etc   ; mathematical models; Monte Carlo method; unsaturated conditions; infiltration (hydrology); porous media; Richards' equation; stochastic processes; vadose zone; soil water movement; Idaho;     Show all 11 Subjects
Abstract:
... We consider transient flow in unsaturated heterogeneous porous media with uncertain hydraulic parameters. Our aim is to provide unbiased predictions (estimates) of system states, such as pressure head, water content, and fluxes, and to quantify the uncertainty associated with such predictions. We achieve this goal by treating hydraulic parameters as random fields and the corresponding flow equatio ...

11. Stochastic analysis of transient flow in heterogeneous, variably saturated porous media: the van Genuchten-Mualem constitutive model

Author:
Lu, Z.; Zhang, D.
Source:
Vadose zone journal 2002 v.1 no.1
ISSN:
1539-1663
Subject:
unsaturated flow,   etc   ; saturated flow; porous media; vadose zone; soil water movement; mathematical models; stochastic processes; equations; Monte Carlo method; temporal variation; spatial variation;     Show all 11 Subjects
Abstract:
... In this study, on the basis of the van Genuchten-Mualem constitutive relationship, we develop a general nonstationary stochastic model for transient, variably saturated flow in randomly heterogeneous media with the method of moment equations. We first derive partial differential equations governing the statistical moments of the flow quantities by perturbation expansions and then implement these e ...