Variability of Gardner's α for coarse‐textured sediments

Khaleel, Raziuddin; Relyea, J.F.

doi:10.1029/2000wr900398

Cited by 54 publications

(44 citation statements)

References 30 publications

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“…The specific soil hydraulic properties, Gardner's a; and van Genuchten parameters are shown in Table 2. The Gardner's a agreed well with the range of values published by Khaleel and Relyea (2001) for sandy soil; their lowest, 0.0013 cm 21 , was lower than our Fine Sand a; 0.02 cm 21 , and their highest, 0.13 cm 21 , was slightly higher than our Coarse Sand a; 0.11 cm 21 . To further check our conductivity curves we used published parameters for the Campbell (1974) KðuÞ function; the error bars in Fig.…”

Section: The Amherst Sitesupporting

confidence: 80%

Funneled flow mechanisms in layered soil: field investigations

Heilig

Steenhuis

Walter

et al. 2003

Journal of Hydrology

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The movement of water and potential pollutants in the vadose zone of fluvial deposits is often difficult to predict because fineover-coarse layers may behave as capillary barriers, funneling water and dissolved solutes into concentrated preferential flow paths. Capillary barriers have been studied in laboratory experiments and by mathematical analysis with well-defined boundaries but little is known about water and solute movement in naturally layered soils. This paper demonstrates how naturally occurring capillary barriers affect water and solute movement. Experiments were carried-out in a river valley near Amherst, MA and on a prehistoric beach near Cornell University in Ithaca, NY. Dye tracer and chloride were initially applied near the soil surface, followed by intermittent rainfall over several weeks. After 2-6 weeks the blue dye, soil water content, and chloride concentration distributions in the soil profile were examined by excavating a trench and photographing and sampling the exposed soil face. At both sites, the infiltrating water was diverted and flowed laterally over a relatively coarse layer. At the Cornell site, flow broke through the fine -coarse interface into the coarse layer at a few points along the barrier. The primary breakthrough at the Cornell site occurred at a horizontal section of the interface, 2 m down-slope from the point of dye application. The capillary diversions generally agreed with current theory, however, the flow patterns were difficult to predict accurately without more detailed information about the soil layering characteristics. q

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Section: The Amherst Sitesupporting

confidence: 80%

Funneled flow mechanisms in layered soil: field investigations

Heilig

Steenhuis

Walter

et al. 2003

Journal of Hydrology

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“…The GE function is commonly used to derive analytical solutions for the deterministic and stochastic analysis of flow in unsaturated soils because of its simplicity (Ferrante et al 2002). Conversely, it is also considered too simple to describe adequately measured relationships between k and h (Khaleel and Relyea 2001). It is commonly considered that the BC function better describe the actual soils and fit experimental data well.…”

Section: Distributions Of K H and Q H For Different K-h-s E Relationsmentioning

confidence: 99%

Deficiency of Approximate Interblock Conductivities for Simulation of Horizontal Unsaturated Flow

et al. 2011

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Determination of appropriate horizontal interblock conductivities approximations (k app ) is a critical step for numerical solution of unsaturated flow by finite difference method. This study characterized the horizontal effective interblock conductivity (k H ) and the classical k app by contour map. The deficiencies of the k app were determined by both statistical method and wetting front prediction. Mathematical expressions of the k H were redeveloped for three constitutive hydraulic functions. A large database including ten different k app formulas, three hydraulic functions, and a large range of soil texture is used to determine the deficiencies of the k app for simulation of horizontal unsaturated flow. Some k app may be either higher or lower than the k H since they depend on both the expression forms of the k app and the specific hydraulic functions. For the soil described by the Gardner function, the horizontal wetting front generated from the k H is almost equivalent to the analytical solution, but those predicted from the k app with certain errors. For the soils described by the Brooks-Corey function and the van Genuchten function, the best k app for approximating the k H were also determined, but with conversions for the soils described by the van Genuchten function. For any two k app that hold compatible medians, the k app (>k H ) better tracks the wetting front and makes mass conservation than the k app (

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“…(Section D.7.3) has presented results based on reaction path modeling of the tank liquors using an approach similar to that employed by . His results for tank SX-115 were used as a "base-case" for the simulationsa variety of runs were then carried out by diluting the "base-case" tank composition of Lichtner (2001 It is important to point out that these results do not include any calibration of either the independently estimated hydrologic parameters (taken directly from Khaleel et al 2001) or the laboratory-determined (batch and column) CECs and ion exchange selectivity coefficients.…”

Section: Sx-115 Cesium Contaminationmentioning

confidence: 99%

Field Investigation Report for Waste Management Area S-SX Volume 1 & 2 [SEC 1 Thru 6]

Knepp¹

2002

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Variability of Gardner's α for coarse‐textured sediments

Cited by 54 publications

References 30 publications

Funneled flow mechanisms in layered soil: field investigations

Funneled flow mechanisms in layered soil: field investigations

Deficiency of Approximate Interblock Conductivities for Simulation of Horizontal Unsaturated Flow

Field Investigation Report for Waste Management Area S-SX Volume 1 & 2 [SEC 1 Thru 6]

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