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- W1997614834 abstract "AbstractThe Penman–Monteith (FAO-56 PM) equation is suggested as the standard method for estimating evapotranspiration (ET0) by the International Irrigation and Drainage Committee and Food and Agriculture Organization (FAO). On the other hand, the Hargreaves–Samani (HS) equation is an alternative method compared with the FAO-56 PM equation. In the present study, the original coefficient C of the HS equation is calibrated based on the FAO-56 PM equation for estimating the reference ET0 from 15 meteorological stations in central Iran (about 170,000 km2) under semiarid and arid conditions. After calibration, the new values for C are ranged from 0.0018 to 0.0037. The mean bias error (MBE), the root mean square error (RMSE), and the ratio of average estimations of ET0 (R) values for all stations are ranged from 0.12 to 5.38, −5.35 to 1.15 mm d−1 and 0.64 to 1.28 for the HS equation and from 0.12 to 2.48, −2.2 to 0.60 mm d−1, and 1.00 to 1.05 for the calibrated Hargreaves–Samani equation (CHS), respectively. Results indicate that the average RMSE and MBE values are decreased by 40% and 66%, respectively. Relationships for calibrating the C coefficient on the basis of annual average of daily temperature range (ΔT) and wind speed (V) are proposed, calibrated, and validated. Hence, the CHS equation can be used for ET0 estimates with acceptable accuracy instead of the FAO-56 PM method.Keywords: reference evapotranspirationcalibrated Hargreaves–Samani equationsemiarid and arid environment" @default.
- W1997614834 created "2016-06-24" @default.
- W1997614834 creator A5063493629 @default.
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- W1997614834 date "2013-06-18" @default.
- W1997614834 modified "2023-10-16" @default.
- W1997614834 title "Calibration of Hargreaves–Samani equation for estimating reference evapotranspiration in semiarid and arid regions" @default.
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- W1997614834 doi "https://doi.org/10.1080/03650340.2013.808740" @default.
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