Abstract
The objective of this study was to test an artificial neural network (ANN) for converting pan evaporation data (E p) to estimate reference evapotranspiration (ET0) as a function of the maximum and minimum air temperature. The conventional method that uses Pan coefficient (K p) as a factor to convert E p to ET0, is also considered for the comparison. The ANN has been evaluated under semi-arid conditions in Safiabad Agricultural Research Center (SARC) in the southwest of Iran, comparing daily estimates against those from the FAO-56 Penman–Monteith equation (PM), which was used as standard. The comparison shows that, the conventional method underestimated ET0 obtained by the PM method. The ANN method gave better estimates than the conventional method that requires wind speed and humidity data.
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Acknowledgments
The author would like to thank the anonymous reviewers for their valuable comments and suggestions which improved the content of the paper. This study is the partial work of Project No. 7351023/1/02 supported by University of Tehran and was done in Department of Irrigation and Drainage Engineering, Faculty of Agricultural Engineering, College of Abourayhan. The meteorological data were provided from Iran Meteorological Organization.
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Communicated by A. Kassam.
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Rahimi Khoob, A. Artificial neural network estimation of reference evapotranspiration from pan evaporation in a semi-arid environment. Irrig Sci 27, 35–39 (2008). https://doi.org/10.1007/s00271-008-0119-y
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DOI: https://doi.org/10.1007/s00271-008-0119-y