Research Article
May 1982
Vadose Zone Permeability Tests: Unsteady Flow
Authors: Daniel B. Stephens and Shlomo P. NeumanAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 108, Issue 5
Abstract
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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Published In
Journal of the Hydraulics Division
Volume 108 • Issue 5 • May 1982
Pages: 660 - 677
Copyright
© 1982 American Society of Civil Engineers.
History
Published in print: May 1982
Published online: Feb 3, 2021
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Authors
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Daniel B. Stephens
Asst. Prof. of Hydr., Dept of Geoscience, New Mexico Inst. of Mining and Tech., Socorro, N.M.
Shlomo P. Neuman
Prof. of Hydr., Dept. of Hydr. and Water Resources, Univ. of Arizona, Tucson, Ariz.
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