Effective unsaturated hydraulic conductivity for computing one-dimensional flow in heterogeneous porous media

D. D. Bosch, T. C J Yeh

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Steady-state and transient one-dimensional unsaturated flow in vertically stratified porous media are examined. Saturated hydraulic conductivity and the alpha parameter of the exponential hydraulic conductivity function were assumed to vary from soil layer to soil layer. The use of effective unsaturated hydraulic conductivity to compute matric potential in the soil profile is demonstrated. Results indicate that soils with vertical variation in these hydraulic parameters can be represented by a single effective parameter set. The harmonic mean of the set of hydraulic parameters for each of the soil layers produces accurate results when used as an effective parameter for unsaturated transient flow with layering perpendicular to the direction of flow. A direct relation for calculating specific moisture capacity based on hydraulic and moisture characteristics of the soil is also presented.

Original languageEnglish (US)
Pages (from-to)2035-2040
Number of pages6
JournalTransactions of the American Society of Agricultural Engineers
Volume32
Issue number6
StatePublished - Nov 1989

Fingerprint

unsaturated hydraulic conductivity
Hydraulic conductivity
porous media
Porous materials
porous medium
hydraulic conductivity
Soil
Soils
fluid mechanics
unsaturated flow
soil
hydraulics
Hydraulics
moisture
Moisture
transient flow
matric potential
saturated hydraulic conductivity
soil profiles
soil profile

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)

Cite this

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AB - Steady-state and transient one-dimensional unsaturated flow in vertically stratified porous media are examined. Saturated hydraulic conductivity and the alpha parameter of the exponential hydraulic conductivity function were assumed to vary from soil layer to soil layer. The use of effective unsaturated hydraulic conductivity to compute matric potential in the soil profile is demonstrated. Results indicate that soils with vertical variation in these hydraulic parameters can be represented by a single effective parameter set. The harmonic mean of the set of hydraulic parameters for each of the soil layers produces accurate results when used as an effective parameter for unsaturated transient flow with layering perpendicular to the direction of flow. A direct relation for calculating specific moisture capacity based on hydraulic and moisture characteristics of the soil is also presented.

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