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首页> 外文期刊>Archives of Agronomy and Soil Science >Comparison of Hargreaves and FAO56 equations for estimating monthly evapotranspiration for semi-arid and arid environments
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Comparison of Hargreaves and FAO56 equations for estimating monthly evapotranspiration for semi-arid and arid environments

机译：比较Hargreaves和FAO56方程以估算半干旱和干旱环境下的每月蒸散量

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摘要

The objectives of this study are to compare reference evapotranspiration (ET0) computed using different forms of the Hargreaves (HG) equation with the standard FAO56PM; and to compare ET0 computed using the FAO56PM with limited data with the standard FAO56PM complete data set method. For this purpose, climatic data from 12 weather stations covering an area of 90 km2 of predominantly arid and semi-arid conditions are used. Ratios of ET0 estimated using the updated HG equation were closer to 1 when compared with the HG equations and ET0-est. Also, RMSE, ME and R 2 ranged from 0.235 to 0.526 mm day−1, −0.526 to 0.383 mm day−1, and 0.945 to 0.989, respectively. Therefore, the updated HG equation can be used for ET0 estimates instead of using the FAO56PM method with acceptable accuracy. In addition, it was found that the standard FAO56PM can be used with estimated solar radiation and humidity from temperature data and estimates of mean wind speed. In conclusion, this study produced two accurate methods that can be used to calculate monthly ET0 in conditions characterized by limited data, arid and semi-arid environments.
机译：本研究的目的是将使用不同形式的Hargreaves（HG）方程计算出的参考蒸散量（ET 0 ）与标准FAO56PM进行比较；并将使用FAO56PM计算出的ET 0 与有限数据与标准FAO56PM完整数据集方法进行比较。为此，使用了来自12个气象站的气候数据，这些气象站的主要干旱和半干旱条件为90 km 2 。与HG方程和ET 0 -est相比，使用更新后的HG方程估算的ET 0 的比率接近于1。此外，RMSE，ME和R 2 的范围从0.235至0.526毫米天 -1> sup，从0.526至0.383毫米天 ∠1 ，以及0.945至0.989。因此，更新后的HG方程可用于ET 0 估计，而不是使用具有可接受准确性的FAO56PM方法。此外，还发现标准FAO56PM可以与温度数据和平均风速的估计值一起估算太阳辐射和湿度。总之，这项研究产生了两种准确的方法，可用于在数据有限，干旱和半干旱环境下表征月度ET 0 。

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