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


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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