Bowen Ratio and Penman: Australian-California Tests

by W. O. Pruitt, Univ of California, Davis, CA, USA,
B. D. Swann, Univ of California, Davis, CA, USA,
A. Held, Univ of California, Davis, CA, USA,
Bruce Sutton, Univ of California, Davis, CA, USA,
A. Matista, Univ of California, Davis, CA, USA,
T. C. Hsiao, Univ of California, Davis, CA, USA,



Document Type: Proceeding Paper

Part of: Steel Structures

Abstract:

Results are presented of evapotranspiration (ET) studies conducted in Davis, California and at two locations in Australia. Good agreements were obtained in early comparisons of Bowen Ratio ET estimates (ETB) and of potential evapotranspiration (ETP) based on a Davis calibration of an hourly H. L. Penman model. Davis and Australian results of 1985-87 confirmed this. However, they also illustrate a range of problems which can occur with the Bowen Ratio method, particularly when the Bowen Ratio +63,drops below a value of minus 0. 3 to minus 0. 4. Results are discussed in light of the error analysis of D. E. Angus and P. J. Watts.

Subject Headings: Evapotranspiration | Errors (statistics) | Water resources | Soil water | Soil analysis | Mathematical models | Hydrologic models | California | United States | Australia

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