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Position: Home > Articles > Global Evaluation and Calibration on ET_0 Calculation Method in Guizhou Area Water Saving Irrigation 2014 (10) 79-83+89

贵州省ET_0计算方法的全局性评价及其率定

作  者：
高晓丽;彭世彰;徐俊增;杨静;张和喜
单  位：
河海大学水文水资源与水利工程科学国家重点实验室;贵州省气象台;贵州省水利科学研究院
关键词：
贵州省;参考作物需水量;FAO-56Penman Monteith法;相关系数;平均相对误差;均方根误差
摘  要：
为了获取适合贵州地区时空全局的参考作物需水量少参数计算方法,根据对贵州省1959-2011年降雨量的降雨频率曲线分析,选取了2008年、2007年、2010年和2009年分别作为贵州省丰水年、平水年、枯水年和特枯水年的典型代表水平年,分别运用少参数的Hargreaves法、Hargreaves修正法、Priestly-Taylor法、Irmak-Allen法和Mccloud法计算贵州全省内各站点在不同水平年的逐日ET0,并将其与标准的FAO-56Penman Monteith法计算结果进行相关性和误差分析。结果表明:Hargreaves法、Hargreaves修正法、Priestly-Taylor法和Irmak-Allen法与FAO-56PM法的相关性较好,趋势线斜率为0.855 9~1.186 4,相关系数均大于0.89;经过当地率定后无需风速资料的Priestly-Taylor法与Irmak-Allen法在不同水文年和空间上均具有较高的计算精度,相对误差均小于8%,均方根误差为0.25mm/d,率定后仅需温度资料的Hargreaves法次之,相对误差为10.07%,均方根误差为0.32mm/d。研究结果为贵州地区在资料缺乏气象资料情况下ET0的精确计算提供了有效的方法。
译  名：
Global Evaluation and Calibration on ET_0 Calculation Method in Guizhou Area
作  者：
GAO Xiao-li;PENG Shi-zhang;XU Jun-zeng;YANG Jing;ZHANG He-xi;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University;College of Water Conservancy and Hydropower Engineering,Hohai University;Guizhou Academy of Hydraulic Sciences;
关键词：
Guizhou province;;reference evapotranspiration;;FAO-56Penman Monteith method;;correlation coefficient;;mean relative error;;root mean squared error
摘  要：
In order to obtain the calculation method of reference evapotranspiration(ET0)with less parameter,the correlation and error were analyzed between FAO-56 Penman Monteith method and other calculation method with less parameter.According to the analysis of rainfall frequency for the precipitation data during 1959-2011,the year of 2008,2007,2010 and 2009were selected as the rainy year,the normal precipitation year,the scanty precipitation year,and the extremely low runoff year,respectively.The Hargreaves method,Hargreaves corrected method,Priestly-Taylor method,Irmak-Allen method and Mccloud method with less parameters were applied for computing the daily ET0.The result showed that there was better correlation between FAO-56 PM method and the alternative method except for Mccloud.The slope of trend line ranged from 0.855 9to 1.186 4,and the correlation coefficient were above on 0.89.The calibrated Priestly-Taylor method and the Irmak-Allen method without wind speed performed goodness with the relative error less than 8%and root mean squared error of 0.25mm/d.The calibrated Hargreaves method followed with the relative error of 10.07%and root mean squared error of 0.32mm/d.The achievement will provide the effective calculation method for ET0 under the shortage of meteorology data in Guizhou areas.

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