Evaporation from sparse crops‐an energy combination theory

1985/07/01 by W. James Shuttleworth, J. S. Wallace, Jim Wallace · 28 citations
Agricultural and Biological Sciences · Engineering · Environmental Science · Mathematics · #Aerodynamics #Agronomy #Canopy #Crop #Ecology #Engineering #Environmental science #Evaporation #Greenhouse Technology and Climate Control #Mathematics #Meteorology #Partition (number theory) #Physics #Plant Water Relations and Carbon Dynamics #Plant responses to elevated CO2 #Sensitivity (control systems) #Simple (philosophy) #Soil science #Thermodynamics

paper · doi:10.1002/qj.49711146910

openalex publication_date 1985/07/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04

Abstract

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.

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