Evaluation of the accuracy of different combined methods for estimating the potential evapotranspiration in different climates (case study: Iran)

Document Type : Research Paper

Authors

1 Ph.D. Candidate, Department of Water Engineering, Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran

2 Professor, Department of Water Engineering, Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran

3 Assistant Professor, Department of Water Engineering, Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran

Abstract

Estimating the exact value of reference evapotranspiration is very important in irrigation planning and determining the irrigation frequency. There are different methods for estimating the reference crop evapotranspiration. The aim of this study was to find the best combined method for estimating the reference evapotranspiration in arid, semi-arid, semi-humid and humid climates of Iran. In this study, based on different necessary data from first order weather stations in the period of 1995 to 2014, the reference evapotranspiration was calculated by some combined methods and compared with FAO 56 Penman Monteith method. The results showed that all methods except Businger and Van bavel method have a good correlation with FAO 56 Penman Monteith (R^2 > 0.96). The accuracy of Businger and Van bavel methods in all regions were low with RMSE and MAE values greater than 0.9 and 0.55 mm per day, respectively. In arid, humid and semi-humid regions of Iran, Penman 1948 and Penman Wright 1972 methods with RMSE and MAE values less than 0.39 mm per day and in semi- arid regions of Iran Penman Wright 1972 methods and Penman 1948 with RMSE and MAE values less than 0.35 mm per day had the highest accuracy.

Keywords


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