Comparisons of reference evapotranspiration forecasting methods with public weather forecasts for Youth Canal Irrigation District in Guangdong
YAN Chengming1,2, LIU Meng2, LUO Yufeng2*
1.Guangdong Polytechnic of Water Resources and Electric Engineering, Guangzhou, Guangdong 510925, China; 2.State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China
Abstract:Accurate method for forecasting reference evapotranspiration(ET0)in Youth Canal Irrigation District of Guangdong province was investigated to develop accurate irrigation forecasts and reduce agricultural water use. Daily weather observation data of the Zhanjiang Weather Station from January 1, 2003 to May 31, 2017 and daily public weather forecast data of 7 days ahead from January 1, 2016 to May 31, 2017 were collected. Forecasted ET0 from weather forecasts and Hargreaves-Samani(HS)method, reduced set Penman-Monteith(PT), and the daily average modification method were compared with calculated ET0 with FAO-56 Penman-Monteith and observed weather data. The results show that the average values of mean absolute error(MAE)of the 3 methods above are 0.908 3, 0.903 1 and 0.947 9 mm/d respectively, the root mean square errors(RMSE)are 1.099 1, 1.099 9 and 1.192 4 mm/d respectively and the correlation coefficients are 0.649 5, 0.649 8 and 0.615 9,respectively. Among the 3 methods, the PT has the best values of MAE and correlation coefficients. The PT method has the highest accuracy for the forecast horizon of 1—5 day while the HS method is the best for the forecast horizon of 6—7 days. Therefore, the PT method is recommended for ET0 forecasting Youth Canal Irrigation District.
晏成明,, 刘梦, 罗玉峰*. 基于公共天气预报的广东青年运河灌区参考作物腾发量预报方法比较[J]. 排灌机械工程学报, 2018, 36(8): 738-743.
YAN Chengming,, LIU Meng, LUO Yufeng*. Comparisons of reference evapotranspiration forecasting methods with public weather forecasts for Youth Canal Irrigation District in Guangdong. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(8): 738-743.
[1]闫浩芳, 史海滨, 薛铸,等. 内蒙古河套灌区ET0不同计算方法的对比研究[J]. 农业工程学报, 2008, 24(4):103-106. YAN Haofang, SHI Haibin, XUE Zhu, et al. Comparison of estimating ET0 with different methods in Hetao Irrigation District in Inner Mongolia[J]. Transactions of the CSAE, 2008, 24(4): 103-106.(in Chinese)[2]丁加丽, 彭世彰, 徐俊增,等. 基于温度资料的参考作物蒸发蒸腾量计算方法[J]. 河海大学学报(自然科学版), 2007, 35(6):633-637. DING Jiali, PENG Shizhang, XU Junzeng, et al. Calculation method for reference crop evaportranspiration based on temperature data[J]. Journal of Hohai University(natural sciences), 2007, 35(6):633-637.(in Chinese)[3]冯禹, 崔宁博, 龚道枝. 机器学习算法和Hargreaves模型在四川盆地ET0计算中的比较[J]. 中国农业气象, 2016, 37(4): 415-421. FENG Yu, CUI Ningbo, GONG Daozhi. Comparison of machine learning algorithms and hargreaves model for reference evapotranspiration estimation in Sichuan Basin[J]. Chinese journal of agrometeorology, 2016, 37(4): 415-421.(in Chinese)[4]万露文, 张正栋, 董才文,等. 韩江流域参考作物蒸散量时空变化及其影响因素[J]. 华南师范大学学报(自然科学版), 2017, 49(4):73-81. WAN Luwen, ZHANG Zhengdong, DONG Caiwen, et al. The study on influence factors of reference crop evapotranspiration in Hanjiang River Basin and its spatio-temporal change[J]. Journal of South China Normal University(natural science edition), 2017, 49(4):73-81.(in Chinese)[5]刘可晶, 王文, 荣艳淑. 东江流域蒸散发量变化趋势及其原因分析[J]. 广东气象, 2010, 32(6):43-47. LIU Kejing, WANG Wen, RONG Yanshu. Change trend and its reason of evapotranspiration in Dongjiang basin[J]. Guangdong meteorology, 2010, 32(6):43-47.(in Chinese)[6]李铁, 王海丽, 黄明高,等. 雷州青年运河灌区农业节水补偿实践研究[J]. 节水灌溉, 2016(2):79-83. LI Tie, WANG Haili, HUANG Minggao, et al. Agricultural water saving compensation practice in Leizhou Youth Canal Irrigation District[J]. Water saving irrigation, 2016(2):79-83.(in Chinese)[7]常晓敏, 高占义, 王少丽,等. 基于气温预报和HS公式的不同生育期参考作物腾发量预报[J]. 节水灌溉, 2016(8):169-174. CHANG Xiaomin, GAO Zhanyi, WANG Shaoli, et al. Different growth period forecasting reference crop evapotranspiration based on temperature forecast and Hargreaves-Samani equation[J]. Water saving irrigation, 2016(8):169-174.(in Chinese)[8]茆智, 李远华,李会昌. 逐日作物需水量预测数学模型研究[J]. 武汉水利电力大学学报, 1995,28(3):253-259. MAO Zhi, LI Yuanhua, LI Huichang. Study of mathe-matic model for forecasting daily crop evapotranspiration[J].Journal of Wuhan University of Hydraulic and Electric Engineering, 1995,28(3):253-259.(in Chinese)[9]罗玉峰, 罗红英, 白凯华,等. 基于气温预报的参考作物腾发量预报方法比较[J]. 节水灌溉, 2016(5):91-96. LUO Yufeng, LUO Hongying, BAI Kaihua, et al. Comparisons of reference crop evapotranspiration forecasting methods based on temperature forecasts[J]. Water saving irrigation, 2016(5):91-96.(in Chinese)[10]刘梦, 罗玉峰, 汪文超,等. 基于天气预报的漳河灌区参考作物腾发量预报方法比较[J]. 农业工程学报, 2017, 33(19):156-162. LIU Meng, LUO Yufeng, WANG Wenchao, et al. Comparison of three reference crop evapotranspiration forecasting methods based on short-term weather forecast in Zhanghe irrigation district[J]. Transactions of the CSAE, 2017, 33(19):156-162.(in Chinese)