Abstract
Evapotranspiration is a fundamental component of the hydrological cycle. The standard Penman-Monteith (PM) equation uses a plenty of data to assess reference evapotranspiration (ET0) that are not available at many meteorological locations. In such circumstances, temperature-based ET0 equations are often used. The objectives of this research are as follows: (i) to assess ET0 using several temperature-based approaches and (ii) to evaluate an impact of the estimated wind speed on the temperature-based ET0 approaches. Thornthwaite, Hargreaves, and three PM approaches based on temperature were used to assess ET0 for eight locations in Serbia. Accurate ET0 estimates at all locations are provided by the temperature-based PM equation with local average wind speed. The ET0 estimates are less precise in the case if the regional average (1.3 m s−1) or the global average (2.0 m s−1) is used. The low reliability of the Hargreaves equation decreases additionally by decreasing the wind speed. The reliability of the Thornthwaite equation is also very low independently from the wind speed. This study clearly proposes using local average wind speed in the temperature-based PM equation. Further research should be done in the other regions with a higher average wind speed than in Serbia.
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The data are available from the corresponding author upon request.
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Acknowledgments
The authors would like to thank four anonymous reviewers for their valuable comments.
Funding
The presented research is funded by the Ministry of Education, Science and Technological Development of the Republic of Serbia and a part of the project of Serbian Academy of Sciences and Arts Branch in Nis (O-15-18).
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Slavisa Trajkovic designed the initial research, conducted the research, and wrote the initial manuscript except the “Introduction” chapter. Milan Gocic contributed in terms of improving the initial research, checking the statistical analysis, plotting the graphs, writing the “Introduction” chapter, improving the written language of the manuscript, and checking the overall logical flow of the manuscript. In addition, the authors pointed out necessary comments towards improving the quality of the final manuscript.
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Responsible Editor: Broder J. Merkel
This paper was selected from the 2nd Conference of the Arabian Journal of Geosciences (CAJG), Tunisia 2019
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Trajkovic, S., Gocic, M. Evaluation of three wind speed approaches in temperature-based ET0 equations: a case study in Serbia. Arab J Geosci 14, 35 (2021). https://doi.org/10.1007/s12517-020-06331-5
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DOI: https://doi.org/10.1007/s12517-020-06331-5