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Boundary Conditions and Conductivities used in the Isothermal Model of Evaporation from Soil¹

ABSTRACT

The surface boundary conditions in the isothermal model for computing evaporation from soil were expressed in terms of the wind speed, temperature, and humidity of the ambient air. Use of these parameters along with reduced nodal spacings near the surface produced evaporative fluxes that closely followed the differences in vapor pressure between soil and atmosphere. A simple evaporation experiment was used to show that evaporation rates and soil moisture distributions obtained with these revised boundary conditions were closer to experimental values than were those obtained with the usual conditions defined in terms of potential evaporation and moisture content.

¹ Contribution no. 366, Soil Research Institute, Canada Dep. of Agr., Ottawa, Ont.

² Soil Physicist.

Received for publication March 1, 1971. Accepted for publication August 10, 1971.