Premium
Modified Penman Equation to Provide the Upper Boundary Condition in Computing Evaporation from Soil
Author(s) -
Staple W. J.
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/sssaj1974.03615995003800050038x
Subject(s) - evaporation , vapor pressure , richards equation , flux (metallurgy) , kelvin equation , flow (mathematics) , potential evaporation , soil science , environmental science , hydrology (agriculture) , mathematics , geotechnical engineering , thermodynamics , soil water , chemistry , geology , physics , organic chemistry , adsorption , geometry
Penman's equation for potential evaporation was modified by including in it the relative vapor pressure h of partially dried surface soil. The modified equation was used to predict evaporative flux from drying soil as a boundary condition in the finite difference solution of the flow equation. The method gave satisfactory agreement in a 20‐day test in which evaporation was measured from short columns of soil in a fallowed plot.