Reference Evapotranspiration Estimation in a Highly Advective Semiarid Environment
Publication: Journal of Irrigation and Drainage Engineering
Volume 131, Issue 2
Abstract
Hourly evapotranspiration rates were measured during the irrigation season in a highly advective area in Southern Spain, using a precision weighing lysimeter. Close to the lysimeter, an automatic weather station was located to register hourly values of the most relevant climatic variables. Several methods to estimate were evaluated for hourly and daily estimates. Accuracy was assessed from ordinary regression and from error analysis of the comparisons against measured values. FAO-24 methods showed a strong tendency to overestimate throughout the whole range of evaporation. Ritchie-type and Hargreaves equations had a similar behavior, underpredicting for and vice versa. Penman locally adjusted and ASCE-PM performed the best, followed by FAO-PM. Penman-63 also gave excellent daily estimates. The poor behavior of the Priestley–Taylor equation improved after applying the Jury and Tanner correction, but still remains at a very high noise level. With the exception of ASCE-PM and FAO-PM, the rest of the methods showed a tendency to underpredict more with increasing advective intensities. However, that tendency is very mild in the case of Penman locally adjusted.
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Acknowledgments
The writers thank Dr. R. G. Allen for encouraging them to prepare this paper and for reviewing the first draft of the manuscript. They are also grateful to three referees for their useful comments.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 131 • Issue 2 • April 2005
Pages: 147 - 163
Copyright
© 2005 ASCE.
History
Received: Dec 23, 2003
Accepted: Apr 29, 2004
Published online: Apr 1, 2005
Published in print: Apr 2005
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