Applicability evaluation of daily reference crop evapotranspiration models in Northwest China
YU Ting1, CUI Ningbo1,2*, ZHANG Qingwen1, HU Xiaotao3
1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China; 2. Provincial Key Laboratory of Water-Saving Agriculture in Hill Area of Southern China, Chengdu, Sichuan 610066, China; 3. Institute of Water-Saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China
In order to recommend a simplified calculation model suitable for the reference crop evapotranspiration(ET0)in Northwest China, the weather data of nearly 50 a per day for 9 representative stations were applied, and the ET0 calculated by the FAO-56 Penman-Monteith(PM)model was used as the standard value. Based on the comprehensive method of Kimberly Penman(KP), FAO 1979 Penman(PM 17), FAO 24 Penman(PM 24), FAO 1948 Penman(PM 48), FAO 79 Penman(PM 79)models, three temperature-based methods Hargreaves-Samani(HS), Mc Cloud(MC), Hargreaves(Har)model, 5 Priestley-Taylor-1(PT-1)based on radiation method, Priestley-Taylor-2(PT-2), FAO-24 Radiation(FAO Ra), Makkink(Mak), Irmark-Allen(IA), and Irmark(Irm)models were evaluated for applicability in the northwest region ET0. The results show that the calculation accuracy of 14 models in Northwest China is obvious. The average R2, MAE, RMSE and nRMSE of the PM 48(comprehensive method), HS(temperature method)and PT-1(radiation method)models with the highest simulation accuracy in the whole region are 0.978, 0.767 3 mm/d, 0.842 3 mm/d and 25.622%, 0.735, 0.920 mm/d, 1.187 mm/d and 36.556%, 0.736, 1.392 mm/d, 1.826 mm/d and 57.992%, respectively.
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