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Diurnal Soil‐Water Evaporation: Comparison of Measured and Calculated Soil‐Water Fluxes
Author(s) -
Jackson R. D.,
Reginato R. J.,
Kimball B. A.,
Nakayama F. S.
Publication year - 1974
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/sssaj1974.03615995003800060012x
Subject(s) - evaporation , soil water , isothermal process , soil science , water vapor , potential evaporation , water content , environmental science , hydrology (agriculture) , atmospheric sciences , chemistry , thermodynamics , geology , physics , geotechnical engineering , organic chemistry
The Philip and DeVries theory and the “isothermal” theory were used to predict diurnal soil water fluxes near the soil surface. The predicted values were compared with those obtained by measurements of soil‐water content, soil temperature, and evaporation. Previously measured soil‐water diffusivities were used in the theoretical calculations. The thermal vapor diffusivities were calculated using both the “simple” and the “complete” theory of Philip and DeVries. Comparison of measured and calculated fluxes indicated that the theory of Philip and DeVries predicts the measured values better at intermediate water contents, but the “isothermal” theory predicts values better at high and very low water contents.