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Evaporation of Water From Soils As Influenced By Drying With Wind or Radiation
Author(s) -
Hanks R. J.,
Gardner H. R.,
Fairbourn M. L.
Publication year - 1967
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/sssaj1967.03615995003100050001x
Subject(s) - soil water , evaporation , saturation (graph theory) , water content , infiltration (hvac) , environmental science , soil science , isothermal process , water vapor , hydrology (agriculture) , chemistry , materials science , geology , geotechnical engineering , meteorology , thermodynamics , composite material , physics , mathematics , organic chemistry , combinatorics
The evaporation rate from three soils initially wet was made the same by adjusting the wind and radiation intensity. The wind treatment caused a temperature depression at the soil surface initially which nearly disappeared after about 5 days. The radiation treatment caused a temperature increase at the soil surface which increased with time. Soil water content profiles measured as a function of time showed the water content near the soil surface to be higher for the wind treatment than for the radiation treatment. The components of flow due to temperature and suction gradients for both liquid and vapor flow were estimated using the analysis of Philip and de Vries. This analysis indicated the cumulative downward vapor flow due to temperature gradients amounted to about 10% of the net upward flow in 40 days at the 5‐cm depth for one soil for the radiation treatment. Computations of evaporation assuming isothermal conditions for soils initially wet to near saturation would probably estimate total evaporation within 10%, and probably be sufficiently accurate for many purposes.