Modification of the Coefficients of some Equations for Estimation of Evapotranspiration of the Reference Plant

Safari, Fatemeh; Kaviani, Abbas; Azizian Ghatar, Asghar; Ramezani Etedali, Hadi

doi:10.22034/jewe.2021.293310.1593

Document Type : Research Paper

Authors

¹ PhD Scholar, Department of Water Science and Engineering, Faculty of Agricultural and Natural Resources, Imam Khomeini International University, Qazvin, Iran

² Assoc. Professor, Water Science and Engineering Department, Faculty of Agricultural and Natural Resources, Imam Khomeini International University, Qazvin, Iran

³ Assist. Professor, Water Science and Engineering Department, Faculty of Agricultural and Natural Resources, Imam Khomeini International University, Qazvin, Iran

⁴ 2Assoc. Professor, Water Science and Engineering Department, Faculty of Agricultural and Natural Resources, Imam Khomeini International University, Qazvin, Iran

https://doi.org/10.22034/jewe.2021.293310.1593

Abstract

Iran is located in the arid and semi-arid belt of the world, which is characterized by low rainfall, thunderstorms, flood flows, and high evapotranspiration. Therefore, quantitative evaluation of evapotranspiration on a regional scale is necessary for water resources management, crop production, and environmental assessments in irrigated lands. In this study, to estimate ETo in four synoptic stations with arid, semi-arid, humid, and semi-humid climates, meteorological data such as temperature, net radiation, relative humidity, and wind speed were used for 1990-2010. Potational evapotranspiration was calculated using 5 different methods, including Hargreaves-Samani, Blaney-Criddle, Priestly-Tailor, Turc, and Makkink, besides, the standard FAO-56 was used (because there was no Lysimetric regionally data) to evaluate the applied formulas. In order to evaluate these methods, were used the mean absolute error (MAE), root mean squared error (RMSE), mean bias error (MBE), correlation coefficient (r), Nash -Satclif index (N.S). Based on these indices, Blaney-Criddle method, after the FAO-56 method, which was used as the basis, was selected as the superior method for the four climates in Iran.

Keywords

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Environment and Water Engineering

Modification of the Coefficients of some Equations for Estimation of Evapotranspiration of the Reference Plant

References

References

Volume 8, Issue 2
July 2022
Pages 411-426

Modification of the Coefficients of some Equations for Estimation of Evapotranspiration of the Reference Plant

References

References

Volume 8, Issue 2July 2022Pages 411-426

Volume 8, Issue 2
July 2022
Pages 411-426