Thermodynamic Factors in Evapotranspiration

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by Robert D. Burman, Univ of Wyoming, Laramie, WY, USA,
Marvin Jensen, Univ of Wyoming, Laramie, WY, USA,
Richard G. Allen, Univ of Wyoming, Laramie, WY, USA,

Document Type: Proceeding Paper

Part of: Irrigation Systems for the 21st Century:

Abstract: Many of the methods discussed in this paper are refinements of procedures presented in the report 'Consumptive Use of Water and Irrigation Water Requirements' by M. E. Jensen. The use of the H. L. Penman method and later versions of combination theory such as the J. L. Monteith addition, require estimating factors such as vapor pressure, air density, atmospheric pressure and latent heat of vaporization. These factors also are required for some radiation methods. This paper summarizes estimating procedures from perspectives of: history, thermodynamics, fluid mechanics, and meteorology.

Subject Headings: Thermodynamics | Meteorology | Water resources | Water use | Irrigation water | Radiation | History |

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