Evaporation from sparse crops‐an energy combination theory

W. James Shuttleworth, J. S. Wallace

Research output: Contribution to journalArticlepeer-review

1171 Scopus citations

Abstract

A one‐dimensional model is adopted to describe the energy partition of sparse crops. Theoretical development of this model yields a combination equation which describes evaporation in terms of controlling resistances associated with the plants, and with the soil or water in which they are growing. the equation provides a simple but physically plausible description of the transition between bare substrate and a closed canopy. Although the aerodynamic transfer resistances for incomplete canopies have, as yet, no experimental justification, typical values, appropriate to a specimen agricultural crop and soil, are shown to have limited sensitivity in the model. Processes which require further study if the equation is to be used to calculate evaporation throughout a crop season are also discussed.

Original languageEnglish (US)
Pages (from-to)839-855
Number of pages17
JournalThe Quarterly Journal of the Royal Meteorological Society
Volume111
Issue number465
DOIs
StatePublished - 1985

ASJC Scopus subject areas

  • Atmospheric Science

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