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Article

Calculation of Potential Evapotranspiration and Calibration of the Hargreaves Equation Using Geostatistical Methods over the Last 10 Years in Central Italy

1
Geology Division, School of Science and Technology, University of Camerino, 62032 Camerino, Italy
2
Department of Earth Sciences, Sapienza University of Rome, 00185 Rome, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: John T. Van Stan and Jesus Martinez-Frias
Geosciences 2021, 11(8), 348; https://doi.org/10.3390/geosciences11080348
Received: 24 June 2021 / Revised: 8 August 2021 / Accepted: 17 August 2021 / Published: 19 August 2021
Potential evapotranspiration (ET0) is an indicator of great interest for water budget analysis and the agricultural sector. Therefore, the purpose of this study was to make the calculation reliable even if only the temperature data were present. In this research, the ET0 was initially calculated for a limited number of weather stations (12) using the Penman–Monteith method. In some cases, the simplified Penman–Monteith formula was adopted, while in others, as in the case of mountain weather stations, the complete formula was employed to consider the differences in vegetation, deduced from satellite surveys. Subsequently, the ET0 was calculated with the Hargreaves–Samani (HS) formula, calibrating the Hargreaves coefficient, through the spatialization of ET0, by the geostatistical method. The results showed a high reliability of the HS method in comparison with simplified PM (PM) method, and complete Penman–Monteith (cPM) method, with a minimum calibration of the empirical Hargreaves coefficient. In particular, a very good correlation between the results obtained in the mountain environment with the uncalibrated HS method and the cPM method was also observed in this area, while PM showed discordant and much higher results than ET0 compared with the other methods. It follows that this procedure allowed a more accurate estimate of potential evapotranspiration with a view to territory management, both in terms of water resources and the irrigation needs of the vegetation. View Full-Text
Keywords: interpolation; GIS; ET0; kriging; Penman–Monteith; Hargreaves interpolation; GIS; ET0; kriging; Penman–Monteith; Hargreaves
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MDPI and ACS Style

Gentilucci, M.; Bufalini, M.; Materazzi, M.; Barbieri, M.; Aringoli, D.; Farabollini, P.; Pambianchi, G. Calculation of Potential Evapotranspiration and Calibration of the Hargreaves Equation Using Geostatistical Methods over the Last 10 Years in Central Italy. Geosciences 2021, 11, 348. https://doi.org/10.3390/geosciences11080348

AMA Style

Gentilucci M, Bufalini M, Materazzi M, Barbieri M, Aringoli D, Farabollini P, Pambianchi G. Calculation of Potential Evapotranspiration and Calibration of the Hargreaves Equation Using Geostatistical Methods over the Last 10 Years in Central Italy. Geosciences. 2021; 11(8):348. https://doi.org/10.3390/geosciences11080348

Chicago/Turabian Style

Gentilucci, Matteo, Margherita Bufalini, Marco Materazzi, Maurizio Barbieri, Domenico Aringoli, Piero Farabollini, and Gilberto Pambianchi. 2021. "Calculation of Potential Evapotranspiration and Calibration of the Hargreaves Equation Using Geostatistical Methods over the Last 10 Years in Central Italy" Geosciences 11, no. 8: 348. https://doi.org/10.3390/geosciences11080348

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