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Use of the Green‐Ampt Equation with Variable Conductivity
Author(s) -
Ahuja L. R.,
Tsuji G. Y.
Publication year - 1976
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/sssaj1976.03615995004000040045x
Subject(s) - sorptivity , infiltration (hvac) , hydraulic conductivity , piecewise , mathematics , soil science , soil water , conductivity , mathematical analysis , environmental science , thermodynamics , physics , compressive strength , quantum mechanics
A comparison with Phillp's two‐term equation, derived from a series solution involving t 1/2 , indicates that the hydraulic conductivity in the Green‐Ampt equation of vertical infiltration varies with time when the soil water content of the transmission zone is assumed to be constant. Use of the Green‐Ampt equation with a continuously variable conductivity or a piecewise application of the equation as an extension of Philip's two‐term equation resulted in improved prediction of infiltration in two Hawaii soils. Both these forms of application require three parameters, hydraulic conductivity, sorptivity, and constant A , which have well‐established physical meaning.