| Cite this article: | 高蓉,吴雷,顾世祥,等.参考作物腾发量计算方法在云南立体气候条件下的适用性研究[J].灌溉排水学报,0,():-. |
| gaorong,wulei,gushixiang,et al.参考作物腾发量计算方法在云南立体气候条件下的适用性研究[J].灌溉排水学报,0,():-. |
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| Sduty on Adaptation of Reference Crop Evapotranspiration Calculation Mthods under Stereoclimatic Conditions in Yunnan Province |
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gaorong1,2, wulei1,2, gushixiang1,2, zhaoshaoxi1,2, lilei1,3,3,2, sujianguang1,3,2, yangtao1,3,2
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1. Yunnan Institute of Water &2.Hydropower Engineering Investigation, Design and Research;3.amp
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| Abstract: |
| Abstract: Crop water demand calculation is the basis of irrigation system design and field water resource allocation. Reference crop evapotranspiration (ET0) estimation is the key to crop water demand calculation. Accurate estimation of ET0 is the premise of rational allocation of agricultural water resources. There are many calculation methods of ET0, which are mainly affected by regional climate, topography and geomorphology. Yunnan Province is located in the low latitude plateau, with prominent three-dimensional climate characteristics. The special climate has a significant impact on the calculation method of ET0. Therefore, it is necessary to verify the applicability of different ET0 calculation methods in Yunnan Province.【Objective】In order to reasonably estimate the reference crop evapotranspiration under the special climate conditions in Yunnan Province, which providing reliable basis for the design of irrigation system and water resource allocation, and then achieving the purpose of water conservation and rational utilization of water resources, 【Method】We based on the data of 14 meteorological stations in 6 irrigation water zones of Yunnan Province and the FAO recommended ET0 standard calculation method (FAO-56 Penman-Monteith) to evaluate the applicability of six commonly used ET0 calculation methods with criteria and methods which including standard deviation (δ), relative error (RE), consistency index (IOA), Nash-Sutcliffe coefficient (NES), linear regression method and inverse distance weighted average method. 【Result】ET0 increased with the decrease of rainfall. The change rule of monthly ET0 was basically the same in each partition. Influenced by the monsoon climate of Yunnan special low latitude plateau, it showed a two peak curve change law different from other provinces. The peaks of which was in April and August, respectively. The significant "channel barrier" effect made the climate difference between different regions significant, which made the monthly ET0 differences of different algorithms different among different regions. The applicability of ET0 calculation method in different level years was not consistent. The absolute coefficient of linear regression (R2) of ET0 calculated by other methods to FAO-56 penman Monteith method was greater than 0.9. FAO-79 penman method and Irmark-Allen method were significantly correlated in six regions, and FAO-24 penman method was only significant in one region. The RE values of each method in different partition were small, ranging from 0 to 0.28. FAO-79 penman method has the best performance, which IOA and NSE were 0.65-0.96 and 0.58-0.89 respectively. The applicability of different reference crop evapotranspiration calculation methods in different regions was obviously different. 【Conclusion】The FAO-79 penman method has the strongest applicability and the highest accuracy in Yunnan except for the dry-hot valley. The values of delta, RE, IOA and NES are 0.01-0.022, 0.04-0.05, 0.88-0.96 and 0.58-0.89, respectively. FAO-24 penman method has the worst application in the whole province, and its error is larger than 12%. It is not suitable for ET0 calculation. The applicability of FAO 24 Radiation method in Yunnan Province is also better after FAO 79 penman method. Except for Northwest Yunnan, the relative error of FAO 24 Radiation method is less than 8%. This method is especially suitable for Southeast Yunnan, where the altitude is relatively low. The relative error is only about 2%. Hargreaves-Samani method has better applicability in dry-hot valley and central Yunnan, and the values of delta, RE, IOA and NES are 0.019-0.024, 0.01-0.02, 0.93-0.96 and 0.78-0.83, respectively. |
| Key words: Stereo climate; Reference crop evapotranspiration; FAO-Penman-Monteith method; Applicability |
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