The Yun-Gui region was divided into 5 regions based on topographic features and adminis-trative divisions.The simulated values of 18 reference crop evapotranspiration models were calculated using daily meteorological data from 15 local meteorological stations over 56 years.The accuracy of the model simulations was compared,and the causes of errors were analyzed with a benchmark calculated by the FAO56 Penman-Monteith method.The results show that the same ET0 model performs guite similar among different zones in Yun-Gui regions.The average coefficient of variation of R2 is 8.81％,and the main factor affecting model accuracy is the radiation energy term,with the secondary factor being the aerodynamic term.The comprehensive method model has the highest simulation accuracy with a R2 of 0.81-0.99,followed by the radiation method with a R2 of 0.84-0.98.The temperature method and water vapor pressure method perform relatively poorly simulation accuracy with a R2 of 0.24-0.83.Among these four methods,the optimal models for each method are FAO 24 Penman(comprehensive score GPI is 0.506,ranking 1st),Inmark(GPI is 0.142,ranking 4th),Hargreaves-Samani(GPI is-0.022,ranking 12th),and Romanenko(GPI is-0.072,ranking 13th).In conclusion,the empirical models FAO 24 Penman and Inmark models are suitable for simplified the calculation of reference crop evapotranspiration in the Yun-Gui region with a subtropical monsoon climate.
维普
万方数据