LOU Zhongqiu,Li zhen.Different Simplified Algorithm Models Simulate Reference Crop Evapotranspiration in Dujiangyan Irrigation District[J].Research of Soil and Water Conservation,2019,26(05):272-277,286.
不同简化算法模型模拟都江堰灌区参考作物蒸散量
- Title:
- Different Simplified Algorithm Models Simulate Reference Crop Evapotranspiration in Dujiangyan Irrigation District
- 关键词:
- 参考作物蒸散量; 辐射; 极限学习机; 广义回归神经网络; Penman-Monteith模型
- Keywords:
- reference crop evapotranspiration; radiation; the extreme learning machine; the generalized regression neural network; the Penman-Monteith model
- 分类号:
- S161.4
- 摘要:
- 为找出适用于都江堰灌区参考作物蒸散量（ET0）的简化计算模型，以灌区附近成都、都江堰、乐山、遂宁和雅安5个站点1961—2017年的逐日气象资料为基础，计算Penman-Monteith （PM）模型、极限学习机（ELM）模型、广义回归神经网络（GRNN）模型、Priestley-Taylor （PT）模型、Makkink （MK）模型、Ritchie （RC）模型的逐日ET0数据，以相对均方根误差（RMSE）、决定系数（R2）和模型效率系数（Ens）为评价指标体系比较不同模型计算精度，分析得出在仅有温度资料和辐射资料情况下适用于都江堰灌区的简化计算模型。结果表明：在计算ET0时，GRNN模型和ELM模型表现出了较高的计算精度和一致性，ELM模型R2，RMSE，Ens分别为0.852 4～0.911 0，0.363～0.413 mm/d和0.856～0.903，GRNN模型R2，RMSE，Ens分别为0.835 7～0.886 3，0.366～0.497 mm/d和0.832～0.879，同时比较输入辐射前后2个模型的模拟精度可知，辐射是ET0计算的关键因素。综上所述，ELM模型在计算ET0日值和月值时的计算精度均较高，可作为都江堰灌区在气象资料缺失情况下的ET0标准计算模型。
- Abstract:
- In order to find a simplified calculation model for reference crop evapotranspiration (ET0) in Dujiangyan Irrigation District, based on daily weather data from 1961 to 2017 in Chengdu, Dujiangyan, Leshan, Suining and Ya’an sites near the irrigation district, we calculated the daily ET0 data of the Penman-Monteith (PM) model, the extreme learning machine (ELM) model, the generalized regression neural network (GRNN) model, the Priestley-Taylor (PT) model, the Makkink (MK) model, and the Ritchie (RC) model. The relative root mean square error (RMSE), the decision coefficient (R2) and the model efficiency coefficient (Ens) were used as the evaluation index system to compare the calculation accuracy of different models. The results showed that the GRNN model and the ELM model displayed the higher computational accuracy and consistency; the R2 of ELM model ranged from 0.852 4 to 0.911 0, and the RMSE ranged form 0.363 to 0.413 mm/d, the Ens ranged from 0.856 to 0.903; the R2 of GRNN model ranged from 0.835 7 to 0.886 3, and the RMSE were 0.366~0.497 mm/d, the Ens were 0.832~0.879. It is known that radiation is a key factor in the calculation of ET0 by comparing the simulation accuracy of the two models before and after the input radiation. In summary, the ELM model has higher calculation accuracy and can be used as the ET0 standard calculation model in the case of missing meteorological data in Dujiangyan Irrigation District.
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备注/Memo
收稿日期:2018-12-17;改回日期:2018-12-25。
作者简介:娄忠秋(1989-),男,甘肃武威人,讲师,主要从事水利工程相关工作。E-mail:louzhongqiu1989@sohu.com
通讯作者:李桢(1982-),男,四川乐山人,硕士,副教授,主要从事水利工程相关工作。E-mail:lizhen1982@sohu.com