A Comparison Between Conventional and M5 Model Tree Methods for Converting Pan Evaporation to Reference Evapotranspiration for Semi-Arid Region

Ali Rahimikhoob (), Maryam Asadi and Mahmood Mashal

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2013, vol. 27, issue 14, 4815-4826

Abstract: In this study, the performance of M5 model tree and conventional method for converting pan evaporation data (E p ) to reference evapotranspiration (ET 0 ) were assessed in semi-arid regions. Conventional method uses pan coefficient (K p ) as a factor to convert E p to ET 0 . Two common K p equations for pans with dry fetch (Allen et al. 1998 ; Abdel-Wahed and Snyder in J Irrig Drain Eng 134(4):425–429, 2008 ) were considered for the comparison. The values of ET 0 derived using these three methods were compared to those estimated using the reference FAO Penmane Monteith (FAO-PM) method under semi-arid conditions of the Khuzestan plain (Southwest Iran). The results showed that the M5 model is the best one to estimate ET 0 over test sites (0.5 mm d −1 of root mean square error (RMSE) and 0.98 of coefficient of determination (R 2 ). Conversely, the performance of the two K p equations was poor. Copyright Springer Science+Business Media Dordrecht 2013

Keywords: Reference evapotranspiration; Pan evaporation; M5 model tree; FAO-56 Penman–Monteith equation (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1007/s11269-013-0440-y

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