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Water Velocity in Unsaturated Porous Materials
Author(s) -
Gardner W. H.,
Hsieh J. C.
Publication year - 1956
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1956.03615995002000020005x
Subject(s) - porous medium , water content , moisture , porosity , permeability (electromagnetism) , mechanics , flow velocity , volumetric flow rate , flow (mathematics) , materials science , constant (computer programming) , soil water , soil science , geotechnical engineering , environmental science , geology , chemistry , composite material , physics , biochemistry , membrane , computer science , programming language
Abstract Rate of flow of moisture in unsaturated porous materials at constant temperature depends upon the gradient of the moisture potential, the size of the flow channel, and other factors relating to the fluid and porous medium but which may be held constant. Size of the flow channel likewise is continually changing. An experimental technique has been devised for direct measurement of the velocity of water movement in materials simulating soils. From these data, with the aid of moisture density measurements, rate of flow can be obtained. Velocity data obtained by this technique are being used to study the mechanics of flow under unsaturated conditions. Further information has been obtained on the nature of the f‐function in the equation, v = k f grad Φ, where v is velocity of flow, k is saturated permeability, and Φ is moisture potential.