MAPPING AND EVALUATION OF REFERENCE EVAPOTRANSPIRATION METHODS UNDER ARID CONDITIONS

Ali, Mahmoud M.; Mahmoud, Ali G.

doi:10.21608/mjae.2017.97453

MAPPING AND EVALUATION OF REFERENCE EVAPOTRANSPIRATION METHODS UNDER ARID CONDITIONS

Document Type : Original Article

Authors

Mahmoud M. Ali ¹
Ali G. Mahmoud ²

¹ Agricultural Engineering Department, Faculty of Agriculture, Fayoum University, Egypt.

² Soil and Water Department, Faculty of Agriculture, Fayoum University, Egypt.

10.21608/mjae.2017.97453

Abstract

Reference evapotranspiration (ETo) is a vital factor in water resources managing and planning. Various estimation methods have been developed for different climatic regions and according to the available data. Therefore, the reliability of such methods depends upon climatic conditions. The present investigation evaluates four temperature based methods: FAO Blaney-Criddle (BC), Turc, Jensen-Haise (JH) and Hargreaves (HG), and two radiation based methods: FAO-radiation (FAO-rad) and Priestley-Taylor (PT) in comparison with the FAO-PM method under arid conditions of Libya. In order to select the best ETo method, the percentage error of estimate (PE), the root mean square error (RMSE), and mean bias error (MBE) were calculated. The obtained ETo values (FAO-PM and the average of best-estimated monthly ETo) were utilized to generate spatial distribution maps of ETo with the aid of Kriging technique. Statistical analysis of the obtained results revealed that, Turc equation fitted well for the northern part of the study area. Which include Nalut, Zuara, Mosrata, Sirt, Shahat, Derna, Tubruk, Hon, Galo and Gagbub. While for southern zone, HG equation performed better for Opari and Tazirbu, BC equation for Kufra and Ghadames, FAO-Rad equation for Sebha; and JH equation for Ghat.

Keywords

Main Subjects

Agricultural Irrigation and Drainage Engineering

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