Estimating Evaporation from Bare Soil and the Crop Coefficient for the Initial Period Using Common Soils Information
Publication: Journal of Irrigation and Drainage Engineering
Volume 131, Issue 1
Abstract
The crop coefficient during the initial period varies with wetting frequency, evaporative demand, and water-holding capacity of the upper soil layer. It is possible to develop a semitheoretical integrated function to predict the average representing the initial period of a growing season when the soil is mostly bare and that incorporates these three factors. The function is based on a two-stage evaporation function as used in the Food and Agriculture Organization Irrigation and Drainage Paper No. 56 (FAO-56) dual crop coefficient method. Parameters in the integrated equation are soil based and can be calculated a priori without field measurements. The procedure can be used to produce graphical figures similar to that introduced in FAO-24 for . Similar to FAO-24, the function utilizes the mean time between wetting events and reference evapotranspiration. In this paper, the development of the procedure and figures for are described. Comparisons with measured evaporation and in southern California indicate relatively good performance by the function without calibration.
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Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 131 • Issue 1 • February 2005
Pages: 14 - 23
Copyright
© 2005 ASCE.
History
Received: Feb 27, 2003
Accepted: Jun 27, 2003
Published online: Feb 1, 2005
Published in print: Feb 2005
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