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首页> 外文期刊>Zeitschrift fur Bewasserungswirtschaft >Regional calibration of hargreaves equation for estimating daily ET0 in a semi-arid environment using windspeed regression.
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Regional calibration of hargreaves equation for estimating daily ET0 in a semi-arid environment using windspeed regression.

机译：哈格里夫斯方程的区域校准，用于使用风速回归估算半干旱环境中的每日ET 0 。

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摘要

The objective of this study was to examine whether it is possible to attain the reliable estimation of ET0 by Hargreaves equation (HG) for daily time step. This objective was reached by the evaluation of the reliability of HG equation as compared to the Penman-Monteith method (PM), which was used as a standard. The nine weather stations selected for this study are located in a semi-arid environment in the Khuzestan plain (in the South West of Iran). Results showed that the accuracy of the ET0 estimated by the original HG equation varied from one location to another. Calibration of the HG equation using simple linear regression did not improve the equation performance. Later, the HG equation was subsequently calibrated using a power regression as a function of windspeed. This second calibration method showed reliable results in all locations, with MBE ranging from -0.12 to 0.24 mm d-1 and RMSE from 0.49 to 0.76 mm d-1. Maxima under- and overestimation amounted to 3 and 4%, respectively. The results suggested that the daily ET0 could be computed relatively accurate using a windspeed based regression calibration of the HG equation, under the semiarid environment.
机译：这项研究的目的是检验是否可以通过每日时间步长的Hargreaves方程（HG）来获得对ET 0 的可靠估计。与标准的Penman-Monteith方法（PM）相比，通过评估HG方程的可靠性可以达到此目的。选择进行这项研究的9个气象站位于Khuzestan平原（伊朗西南部）的半干旱环境中。结果表明，原始HG方程估计的ET 0 的准确性在一个位置到另一个位置之间变化。使用简单的线性回归对HG方程进行校准并不能提高方程的性能。后来，HG方程随后使用功率回归作为风速的函数进行了校准。第二种校准方法在所有位置均显示出可靠的结果，MBE在-0.12至0.24 mm d -1 范围内，RMSE在0.49至0.76 mm d -1 之间。最高估计值过低和过高分别达到了3％和4％。结果表明，在半干旱环境下，使用基于风速的HG方程回归校准可以相对准确地计算每日ET 0 。

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