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Post‐Irrigation Movement of Soil Water: 1. Redistribution
Author(s) -
Gardner W. R.,
Hillel D.,
Benyamini Y.
Publication year - 1970
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr006i003p00851
Subject(s) - thermal diffusivity , soil water , water content , capillary action , redistribution (election) , water retention curve , infiltration (hvac) , hydraulic conductivity , soil science , environmental science , hydrology (agriculture) , geotechnical engineering , thermodynamics , geology , physics , politics , political science , law
Water content measurements by γ‐ray attenuation in soil columns were made during redistribution following irrigation. Approximate solutions of the unsaturated flow equation are derived that describe the water content above the initial wetting front as a function of time. For times sufficiently large, these solutions reduce to the frequently used empirical expression W = a t −b , where W is soil water content, t is time, and a and b are constants. These constants can thus be related to the capillary conductivity and soil water diffusivity.