Comparison of some methods for Reference Evapotranspiration calculation in Shahat Area, Aljabal Alakhdar- Libya

• Mohamed A. MOMEN

  Soil and Water Department. Faculty of Agriculture

  Author

• Osama A. ABDELATTI

  Soil and Water Department, Faculty of Agriculture, Omar Almokhtar University

  Author

This study was conducted to compare some methods for calculating the reference evapotranspiration (ETo) with FAO Penman-Monteith (FPM)which is the recommended method by the FAO to calculate the reference evapotranspiration. Sevenmethods were chosen, three of which depend on the temperature, namely, (Blaney-Criddle BC, Hargreaves- Samani HS, Thornthwaite TW), and four depend on the radiation (radiation Rd, Priestley-Taylor -PT, Makkink MK, Turc TC). Thirty seven years of climatic data for a period of 1963 to 1999 were used from meteorological station of Shahat, Aljabal Alakhdar, Libya. The obtained results showed that the method of Blaney-Criddle was the best performance compared to the FAO Penman Monteith (FPM), where the values ​​of the root mean square error (RMSE), mean bias error (MBE), the maximum error (MAXE), and the relative errors (RE) were 0.33, 0.11, 0.66 mm/day, -0.1%, respectively,while the method of Thornthwaite was the least performance, where the values ​​of the root mean square error (RMSE), mean bias error (MBE), the maximum error (MAXE), and the relative error (RE) were 1.8, 1.69, 2.76 mm/day, -46.48% respectively. The rest of the methods ranged between these values.

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