Revision and Adaptability Evaluation of Temperature-based Methods for Reference
Crop Evapotranspiration in the Three Irrigation Districts of China

doi:10.3969/j.issn.1000-6362.2018.06.001

Abstract

Abstract: Dujiangyan irrigation district, Hetao irrigation district and Pishihang irrigation district are the largest irrigation districts in China. In order to improve the calculation precision of reference crop evapotranspiration(ET 0 ) based on temperature-based methods in the three irrigation districts of China, this paper used FAO-56 Penman-Monteith (PM) method and 8 temperature-based methods of Irmark-Allen (IA), Hargreaves-Samani (HS),Turc (Tur), McCloud (MC), Schendel (Sch), Trajkovic (Tra), Droogres-Allen-1 (DA-1) and Droogres-Allen-2 (DA-2) to calculate ET 0 based on the daily meteorological data of 8 representative stations from 1961 to 2014, and used the results of the PM method as the standard. Based on the equation of linear regression(y=kx+b) of daily ET 0 calculated by 8 temperature-based methods and PM method, this paper selected IA method and Tra method in Dujiangyan irrigation district, selected HS method, DA-1 method and DA-2 method in Hetao irrigation district, selected IA method,HS method, DA-1 method and DA-2 method in Pishihang irrigation district. And those methods selected in each irrigation district were revised by introducing adjustment parameter. And then root mean square error (RMSE), mean relative error (MRE) and Nash-Sutcliffe coefficient (NS) were used to evaluate the adaptability. The results showed that the calculation precision of the revised methods selected in Dujiangyan irrigation district and Pishihang irrigation district were improved significantly. While the calculation precision of the revised methods selected in Hetao irrigation district were not improved significantly. The reviseded IA method (IA -Du method) in Dujiangyan irrigation district had the highest calculation precision. The daily values of RMSE, MRE and NS of IA -Du method were 0.318mm·d-1 , 0.120 and 0.923, and the average values of ten days were 0.201mm·d-1 , 0.093 and 0.959. Meanwhile the calculation precisions of IA -Du method in all months were high. HS method in Hetao irrigation district had the highest calculation precision. The daily values of RMSE, MRE and NS of HS method were 0.898mm·d-1 , 0.326 and 0.785, and the average values of ten days were 0.547mm·d-1 , 0.223 and 0.904. And HS method has high calculation precision in Jan. to May and Oct. to Dec. The revised IA method (IA-Pi method) in Pishihang irrigation district had the highest calculation precision. The daily values of RMSE, MRE and NS of IA-Pi method were 0.534mm·d ?1 , 0.195 and 0.861, and the average values of ten days were 0.390mm·d ?1 , 0.167 and 0.896. Meanwhile the calculation precisions of IA-Pi method in all months were high. Therefore, IA -Du method, HS method and IA-Pi method were recommended as the temperature-based method for calculating ET 0 in Dujiangyan irrigation district, Hetao irrigation districtand and in Pishihang irrigation district respectively.

Key words: Reference crop evapotranspiration, Temperature-based methods, Adaptability evaluation, Dujiangyan irrigation district, Hetao irrigation district, Pishihang irrigation district

YANG Yong-gang, CUI Ning-bo, HU Xiao-tao, GONG Dao-zhi, LI Chen, JIA Yue. Revision and Adaptability Evaluation of Temperature-based Methods for Reference Crop Evapotranspiration in the Three Irrigation Districts of China[J]. Chinese Journal of Agrometeorology, 2018, 39(06): 357-369.

References

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Revision and Adaptability Evaluation of Temperature-based Methods for Reference Crop Evapotranspiration in the Three Irrigation Districts of China

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