| Cite this article: | 郑健,鲍婷婷,杨赟,等.参考作物蒸发蒸腾量计算方法在甘肃省不同区域的适用性分析[J].灌溉排水学报,2022,(10):-. |
| Zhengjian,Baotingting,Yangyun,et al.参考作物蒸发蒸腾量计算方法在甘肃省不同区域的适用性分析[J].灌溉排水学报,2022,(10):-. |
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| Applicability of calculation methods for reference crop evapotranspiration in different regions of Gansu |
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Zhengjian1, Baotingting1, Yangyun2, Chengya1
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1.Lanzhou University of Technology;2.Water Conservancy Research Institute of Linxia Hui Autonomous Prefecture
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| Abstract: |
| 【Objective】In order to realize the accurate calculation of ET0 in the case of shortage of meteorological data. 【Method】Gansu province is divided into four regions: the arid area of Hexi (region I), the semi-arid area in the northern of Longzhong (region II), the semi-humid area in the southern of Longzhong (region III) and the humid area of Longnan and Gannan (region IV). The simplified methods such as Hargreaves-Samani (Har) method, FAO-24 Penman (24PM) method, FAO 1948 Penman (48PM) method, Makkink (Mak) method and Priestley Taylor (PT) method were used to calculate the daily ET0 of 26 national meteorological stations in Gansu Province from 1980 to 2019. And the applicability of the other five methods in four climate zones was evaluated based on the FAO-56 penman Monteith (P-M) method. 【Result】There are obvious differences in the calculation accuracy of the five simplification methods in different districts of Gansu Province. The correlation coefficients of the Har method and the Mak method are closer to 1 respectively with the P-M method, indicating that the fitting degree of the fitted curve is better. It shows high calculation accuracy and good applicability, but the calculation accuracy of the Har method decreases significantly in high altitude areas. The calculation results of 48PM method and 24PM method are larger than that of P-M method, and the calculation results are in the middle. The calculation accuracy of PT method is generally low. Therefore, the order of applicability of the five simplified methods in each division present a trend of Mak method > Har method >48PM method > 24PM method > PT method of the area of I；and the trend of Har method >Mak method > 48PM method > 24PM method >PT method of the area of II, the area of III and IV. 【Conclusion】When there is a lack of meteorological data, it is recommended to use Mak method in the area of I, and it is recommended to use Har method in the area of II, III and IV. |
| Key words: reference crop evapotranspiration; calculation methods; applicability analysis; Gansu Province |
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