Subject: "unsaturated flow" / Journal: Vadose zone journal / Subject: unsaturated flow and diffusion / Text Availability: Citation in PubAg

Author:: Legout, C.; Molenat, J.; Hamon, Y.
Source:: Vadose zone journal 2009 v.8 no.1 pp. 21-31
ISSN:: 1539-1663
Subject:: unsaturated flow, etc ; vadose zone; solutes; soil transport processes; water table; temporal variation; infiltration (hydrology); diffusion; Richards' equation; porous media; granite; Show all 11 Subjects
Abstract:: ... We studied the transport of a nonreactive tracer in an unconsolidated weathered granite column under steady-state flow and transient flow induced by water-table fluctuation in the bottom half of the column. Experiments reproducing one-dimensional vertical flow and tracer transport were performed at two infiltration rates, 12 and 22 mm h⁻¹ Breakthrough data were used (i) to compare tracer dispersio ...
DOI:: 10.2136/vzj2007.0182
: https://dx.doi.org/10.2136/vzj2007.0182

Author:: Podgorney, Robert K.; Fairley, Jerry P.
Source:: Vadose zone journal 2008 v.7 no.1 pp. 332-339
ISSN:: 1539-1663
Subject:: unsaturated flow, etc ; soil water movement; vadose zone; macropores; macropore flow; porous media; sand; infiltration (hydrology); diffusion; temporal variation; Show all 10 Subjects
Abstract:: ... The recent literature contains numerous observations of episodic or intermittent flow in unsaturated flow systems under both constant flux and ponded boundary conditions. Flow systems composed of a heterogeneous porous media, as well as discrete fracture networks, have been cited as examples of systems that can exhibit episodic flow. Episodic outflow events are significant because relatively large ...
DOI:: 10.2136/vzj2006.0107
: https://dx.doi.org/10.2136/vzj2006.0107

Author:: Levin, Janna M.; Herman, Janet S.; Hornberger, George M.; Saiers, James E.
Source:: Vadose zone journal 2006 v.5 no.2 pp. 564-569
ISSN:: 1539-1663
Subject:: unsaturated flow, etc ; soil colloids; soil transport processes; unsaturated conditions; soil pore system; diffusion; infiltration (hydrology); Show all 7 Subjects
Abstract:: ... Colloids may transport contaminants through unsaturated soils to the groundwater, and colloid mobilization is associated with transient hydrological events and sustained, steady flow. We examined mechanisms of colloid mobilization from an intact, unsaturated soil core during relatively steady flow. We collected the core from a site where soils contain 26% clay and infiltration occurs only at capil ...
DOI:: 10.2136/vzj2005.0102
: https://dx.doi.org/10.2136/vzj2005.0102

Author:: Singleton, M.J.; Sonnenthal, E.L.; Conrad, M.E.; DePaolo, D.J.; Gee, G.W.
Source:: Vadose zone journal 2004 v.3 no.3
ISSN:: 1539-1663
Subject:: unsaturated flow, etc ; vadose zone; soil pore water; semiarid zones; infiltration (hydrology); diffusion; evaporation; oxygen; seasonal variation; deuterium; stable isotopes; soil water movement; Show all 12 Subjects
Abstract:: ... Numerical simulations of transport and isotope fractionation provide a method to quantitatively interpret vadose zone pore water stable isotope depth profiles based on soil properties, climatic conditions, and infiltration. We incorporate the temperature-dependent equilibration of stable isotopic species between water and water vapor, and their differing diffusive transport properties into the the ...

Author:: Mortensen, A.P.; Jensen, K.H.; Nilsson, B.; Juhler, R.K.
Source:: Vadose zone journal 2004 v.3 no.2
ISSN:: 1539-1663
Subject:: unsaturated flow, etc ; clay soils; unsaturated conditions; diffusion; preferential flow; vadose zone; soil water movement; Show all 7 Subjects
Abstract:: ... Current monitoring and sampling techniques in unsaturated fractured clay often fail to characterize fast preferential flow. To circumvent these problems, an isolated block (3.5 by 3.5 by 3.3 m) of unsaturated fractured clayey till was used for multiple tracing experiments. The setup allowed full control of the water balance in the block. Experiments at three different steady-state flow rates were ...

Author:: Fairley, J.P.; Podgorney, R.K.; Wood, T.R.
Source:: Vadose zone journal 2004 v.3 no.1
ISSN:: 1539-1663
Subject:: unsaturated flow, etc ; dolomite; simulation models; equations; limestone; porous media; diffusion; vadose zone; soil water movement; Show all 9 Subjects
Abstract:: ... Simulations of flow and transport in variably saturated fractured rock generally assume equilibrium conditions between the fractures and the porous matrix, leading to predictions that are dominated by a diffusive process. Contrary to these predictions, an increasing body of evidence suggests that fracture-dominated flow, under nonequilibrium conditions between the fractures and porous matrix, occu ...

Author:: Pace, M.N.; Mayes, M.A.; Jardine, P.M.; Mehlhorn, T.L.; Zachara, J.M.; Bjornstad, B.N.
Source:: Vadose zone journal 2003 v.2 no.4
ISSN:: 1539-1663
Subject:: unsaturated flow, etc ; sediments; mathematical models; soil pollution; hazardous waste; unsaturated conditions; equations; pollutants; diffusion; preferential flow; vadose zone; Show all 11 Subjects
Abstract:: ... Accelerated migration of contaminants in the vadose zone has been observed beneath tank farms at the U.S. Department of Energy's Hanford Reservation, Richland, WA. This paper focuses on quantifying hydrologic processes that control the fate and transport of contaminants in the unsaturated sediments beneath the Hanford tank farms. The experimental approach involved the use of field relevant, long-t ...

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