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Vadose Zone Permeability Tests: Unsteady Flow

Stephens, Daniel B. / Neuman, Shlomo P.

Saturated-unsaturated flow models are used to simulate transient conditions in four soils during constant head borehole infiltration tests in the vadose zone. Infiltration rate varies directly with saturated hydraulic conductivity and is also influenced by unsaturated soil properties, antecedent moisture conditions, anisotropy and borehole conditions. The method recommended by the U.S. Bureau of Reclamation to determine when to terminate a test may lead to overestimating saturated hydraulic conductivity. Simple graphical procedures are developed to overcome field problems associated with large water volume requirements or long time required to reach steady state by using early time date to estimate the steady infiltration rate.

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Vadose Zone Permeability Tests: Unsteady Flow

Stephens, Daniel B. / Neuman, Shlomo P.

Saturated-unsaturated flow models are used to simulate transient conditions in four soils during constant head borehole infiltration tests in the vadose zone. Infiltration rate varies directly with saturated hydraulic conductivity and is also influenced by unsaturated soil properties, antecedent moisture conditions, anisotropy and borehole conditions. The method recommended by the U.S. Bureau of Reclamation to determine when to terminate a test may lead to overestimating saturated hydraulic conductivity. Simple graphical procedures are developed to overcome field problems associated with large water volume requirements or long time required to reach steady state by using early time date to estimate the steady infiltration rate.

Vadose Zone Permeability Tests: Unsteady Flow

Stephens, Daniel B. / Neuman, Shlomo P.

Saturated-unsaturated flow models are used to simulate transient conditions in four soils during constant head borehole infiltration tests in the vadose zone. Infiltration rate varies directly with saturated hydraulic conductivity and is also influenced by unsaturated soil properties, antecedent moisture conditions, anisotropy and borehole conditions. The method recommended by the U.S. Bureau of Reclamation to determine when to terminate a test may lead to overestimating saturated hydraulic conductivity. Simple graphical procedures are developed to overcome field problems associated with large water volume requirements or long time required to reach steady state by using early time date to estimate the steady infiltration rate.

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Title:

Vadose Zone Permeability Tests: Unsteady Flow

Contributors:

Stephens, Daniel B. (author) / Neuman, Shlomo P. (author)

Published in:

Journal of the Hydraulics Division ; 108 ; 660-677

Publication date:

2021-01-01

Size:

181982-01-01 pages

ISSN:

0044-796X , 2690-2524

DOI:

https://doi.org/10.1061/JYCEAJ.0005863

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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