Analysis and Calibration of Empirical Relationships for Estimating Evapotranspiration in Qatar: Case Study
Publication: Journal of Irrigation and Drainage Engineering
Volume 143, Issue 2
Abstract
Knowledge of evapotranspiration (), which is the process of water loss from vegetated soils due to evaporation and transpiration, is important in real-time irrigation management and water-resource allocation, particularly in water-scarce regions. In this study, several methods used in estimating evapotranspiration, including the Blaney-Criddle, Hargreaves-Samani, Jensen-Haise, Linacre, and Turc methods were calibrated and validated against the Penman-Monteith model, which is considered as the standard method of estimating evapotranspiration. The paper utilizes data from the Doha International Airport meteorological station over a period of 30 years (January 1985–December 2014). values were estimated using the different methods. These values were then compared to those obtained by the Penman-Monteith method. Using appropriate indicators, the Turc method was found to be the best for estimating over Doha (, , and ). The Turc method comes in handy for estimating over Qatar as it utilizes only three meteorological parameters (mean temperature, relative humidity, and solar radiation), which are easily measurable over that area.
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Acknowledgments
This research was made possible by a NPRP award [NPRP 6-064-4-001] from the Qatar National Research Fund (a member of The Qatar Foundation). The statements made herein are solely the responsibility of the authors.
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© 2016 American Society of Civil Engineers.
History
Received: Jan 31, 2016
Accepted: May 30, 2016
Published online: Sep 28, 2016
Published in print: Feb 1, 2017
Discussion open until: Feb 28, 2017
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