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Bulk Stomatal Resistance in Operational Estimates of Evapotranspiration

by Richard G. Allen, Utah State Univ, Logan, UT, USA,



Document Type: Proceeding Paper

Part of: Planning Now for Irrigation and Drainage in the 21st Century

Abstract:

General relationships for estimating canopy or bulk stomatal resistance and aerodynamic resistances of grass and alfalfa reference crops for use in the Penman-J.L. Monteith equation are presented. Resistance relationships are expressed as functions of mean plant height for simplification of estimation. The Penman-Monteith method performed similarly to the 1982 Kimberly Penman equation by J.L. Wright, with better fit to lysimeter data at some clipped grass sites.

Subject Headings: Load and resistance factor design | Vegetation | Aerodynamics | Material properties | Water resources | Porous media | Measuring instruments

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