Calibration of hargreaves equation for estimating monthly reference evapotranspiration in the West of Iran

Joint Authors

Ghamarnia, Houshang
Rezvani, Vahid
Khudai, Irfan
Mirzaei, Husayn

Source

مجلة الفرات للعلوم الزراعية

Publisher

University of Babylon College of Agriculture (Previously) / Al-Qasim Green University College of Agriculture (Currently)

Publication Date

2011-12-31

Country of Publication

Iraq

No. of Pages

11

Main Subjects

Botany

Topics

• Meteorology
• Evaporation
• Iraq
• Iran

English Abstract

In the present study, the Hargreaves-Samani method was calibrated by the Penman-Monteith (PM) equation under semi-arid conditions in the western region of Iran.

Different correction coefficients were used for each station under study instead of the constant coefficient 0.0023 in the Hargreaves equation based on monthly and annual scales.

The corrected coefficients obtained for different regions can be used to estimate ETo for the PM method under the same climates where reliable data are available.

The results also showed that as a larger study area with more weather stations is used and a larger amount of data is obtained, the coefficient of 0.0023 in the Hargreaves equation does not need any further corrections for local calibration purposes.

Data Type

Conference Papers

Record ID

BIM-333249

• APA
• MLA
• AMA