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A Comparison of Two Methods for Determining Soil Water Diffusivity
Author(s) -
Selim H. M.,
Kirkham Don,
Amemiya M.
Publication year - 1970
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/sssaj1970.03615995003400010010x
Subject(s) - thermal diffusivity , infiltration (hvac) , water content , soil science , soil water , tracer , water flow , attenuation , environmental science , materials science , geology , geotechnical engineering , physics , thermodynamics , optics , composite material , nuclear physics
Two methods were used concurrently to determine the soil water diffusivity from horizontal infiltration of water into a soil column. In the first (recent), water content measurements were taken at a fixed position as a function of time by using the gamma attenuation technique. In the second, water content distance distributions were determined as a function of distances from the water source at a fixed time by sectioning the same column. A comparison by the two methods of the diffusivity function for three soil materials showed that the first method is as reliable as the second. Agreement of the diffusivities obtained from the two methods is considered evidence of the validity of the unsaturated water flow equation.