首页 | 本学科首页   官方微博 | 高级检索  
     检索      

Hargreaves公式的全局校正及适用性评价
引用本文:胡庆芳,杨大文,王银堂,杨汉波.Hargreaves公式的全局校正及适用性评价[J].水科学进展,2011,22(2):160-167.
作者姓名:胡庆芳  杨大文  王银堂  杨汉波
作者单位:1.清华大学水利水电工程系, 北京, 100084;
基金项目:“十一五”国家科技支撑计划资助项目(2006BAB14B02); 南京水利科学研究院基金资助项目(Y50701)~~
摘    要:Hargreaves公式是计算参考作物腾发量(ET<,0>)最为简便的经验公式之一,但目前对于该公式在不同气候类型区域的适用性及误差影响因素尚缺乏系统评价.在月时间尺度上,以Penman-Monteith公式计算的ET<,0>为基准值,利用洗牌复合形进化算法(SCE-UA),在中国105个气象站对Hargreaves公...

关 键 词:参考作物腾发量  Hargreaves公式  Penman-Monteith公式  洗牌复合形进化算法  适用性评价
收稿时间:2009-12-22

Global calibration of Hargreaves equation and its applicability in China
HU Qing-fang,YANG Da-wen,WANG Yin-tang,YANG Han-bo.Global calibration of Hargreaves equation and its applicability in China[J].Advances in Water Science,2011,22(2):160-167.
Authors:HU Qing-fang  YANG Da-wen  WANG Yin-tang  YANG Han-bo
Institution:1.Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China;2.Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
Abstract:As one of the simplest empirical methods for positional evapotranspiration(ET0) calculation,it is still lack of systemic evaluation for Hargreaves equation's computational accuracy and applicability evaluation in different climatic regions.In this paper,the Hargreaves equation is calibrated using the global optimization algorithm SCE-UA(Shuffled Complex Evolution method developed at University of Arizona).The value of ET0 calculated by the Penman-Monteith equation is used as the benchmark.The global calibration is done using a monthly time step at 105 climate stations distributed over the continental China as well as on Hainan Island.The regional distribution of the calibrated parameters is analyzed and influencing-actors on the parameters are investigated.The applicability of the calibrated Hargreaves equation in seven different climatic regions is synthetically evaluated for the longterm consistency and the seasonal consistency.The influencing factors on the accuracy of the calibrated Hargreaves equation are investigated using the method of correlation analysis.Results show that globally calibrated parameter values of the Hargreaves equation using SCE-UA are essentially different from that recommended by Food and Agriculture Organization(FAO) of the United Nations.However,the accuracy of the equation is highly promoted and the calibrated parameters at the 105 stations exhibit a certain regional regularity and may vary with annual precipitation and temperature.At almost all the stations on the Qinghai-Tibet Plateau,Northwest and Southwest China,the calibrated Hargreaves equation is applicable all year round.In contrast,poor calculation of ET0 is found in all seasons in South China.The calibrated Hargreaves equation is only valid during summer and autumn seasons over Northeast and North China and the Xinjiang Autonomous Region.Generally,the disability in calculating the aerodynamic component of ET0 is the main source of errors causing computational defect in the Hargreaves equation over different regions.The accuracy of the calibrated Hargreaves at most stations is notably related to the ratio(K) of the aerodynamic component to ET0 calculated by the Penman-Monteith equation.The computational accuracy deteriorates with decreasing of K.The opposite is true for annual precipitation and temperature.While,effects of relative humidity and wind speed on the computational accuracy are rather complicated,varying with regions.
Keywords:ET0  Hargreaves equation  Penman-Monteith equation  SCE-UA  applicability evaluation  
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《水科学进展》浏览原始摘要信息
点击此处可从《水科学进展》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号