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Soil‐Water Diffusivity Values Based Upon Time Dependent Soil‐Water Content Distributions
Author(s) -
Cassel D. K.,
Warrick A. W.,
Nielsen D. R.,
Biggar J. W.
Publication year - 1968
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/sssaj1968.03615995003200060023x
Subject(s) - thermal diffusivity , soil water , soil science , water content , isothermal process , environmental science , attenuation , diffusion , volume (thermodynamics) , geology , geotechnical engineering , thermodynamics , physics , optics
A laboratory method based upon time dependent soil‐water content distributions is presented for calculating isothermal soilwater diffusivity values for soils at 5 to 15 volume percent water. The redistribution of water within sealed soil columns was monitored by gamma‐radiation attenuation at approximately 100 to 1,000 hour intervals over a period exceeding 3 months. Diffusivity values from numerical integration of the diffusion equation were obtained easily and compared favorably with those of previous investigators.