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引用本文: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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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
高蓉,吴雷,顾世祥,等
云南省水利水电勘测设计研究院
摘要:
摘 要:【目的】合理估算云南省特殊气候条件下的参考作物腾发量,验证不同ET0计算方法的适用性。【方法】利用云南省6个灌溉用水分区的14个气象站资料,以FAO推荐的ET0计算方法(FAO-56 Penman-Monteith法)为标准,利用标准差(δ)、相对误差(RE)、一致性指数(IOA)、Nash-Sutcliffe系数(NES)、线性回归法、反距离加权平均法等指标和方法对其他6种常用ET0计算方法的适用性进行评价。【结果】随着降雨的减少,ET0大体上呈增加趋势。受云南特殊低纬高原季风气候及“通道-阻隔”效应影响,云南省各分区逐月ET0值呈现双峰曲线的变化规律,峰值分别位于4月和8月。不同水平年ET0计算方法的适用性不存在一致的规律性,6种ET0计算方法与FAO-56 Penman-Monteith法计算得到的ET0计算结果的线性回归绝对系数(R2)均大于0.9,FAO-79 penman法和Irmark-Allen法于6个分区显著相关, FAO-24 penman法仅在1个分区显著。各分区各种方法的RE值均不大,在0~0.28之间。各方法中IOA值和NSE值在各区表现最好的方法为FAO-79 penman 法,IOA值和NSE值分别为0.65~0.96和0.58~0.89。【结论】FAO-79 penman法在云南省除干热河谷区外的其他区域的适用性最强,计算精度最高;FAO-24 penman法在全省范围内适用最差,误差较大;FAO-24 Radiation法在除滇西北区以外的区域相对误差较小;Hargreaves-Samani法在干热河谷区及滇中区适用性较好。
关键词:  立体气候;参考作物腾发量;FAO-Penman- Monteith法;适用性
DOI:
分类号:S19
基金项目:云南省创新团队专项(2018HC024);科技入滇专项;国家高分辨率对地观测系统重大科技专项(89-Y40-G19-9001-18/20-03)
Sduty on Adaptation of Reference Crop Evapotranspiration Calculation Mthods under Stereoclimatic Conditions in Yunnan Province
gaorong1,2, wulei1,2, gushixiang1,2, zhaoshaoxi1,2, lilei1,3,3,2, sujianguang1,3,2, yangtao1,3,2
1. Yunnan Institute of Water &2.Hydropower Engineering Investigation, Design and Research;3.amp
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