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| DOI：10.13522/j.cnki.ggps.2024372 |
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| Suitable reference crop evapotranspiration models for arid oasis regions |
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ZHANG Xiaoying, LYU Tingbo, LIU Yifan, SHI Pengcheng, WANG Maoyuan
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1. College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832003, China;
2. Key Laboratory of Modern Water-saving Irrigation of Xinjiang Production & Construction Group, Shihezi 832003, China
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| Abstract: |
| 【Objective】Reference crop evapotranspiration (ET0) is a critical parameter for agricultural water management and irrigation scheduling, especially in arid oasis regions where water resources are scarce. While the FAO-56 Penman-Monteith (PM) model is a standard formula for estimating ET0, some of meteorological data required by the model are often unavailable in these areas. This paper proposes a simplified yet accurate model for estimating ET0 in such regions. 【Method】Daily meteorological data from 1955 to 2020 at the Shihezi Meteorological Station were used, with the FAO-56 PM model serving as the reference standard. We compared eight simplified models for calculating daily, monthly and annual ET0. The accuracy of each model was analyzed using statistical metrics, including coefficient of determination (R2), Nash-Sutcliffe efficiency (NSE), root mean square error (RMSE), normalized RMSE (nRMSE), mean absolute error (MAE), and a comprehensive general performance index (GPI).【Result】At daily scale, the radiation-based Priestley-Taylor (PT) model showed the closest agreement with the PM model, followed by the temperature-based Berti-Hargreaves (BH) model. At monthly scale, the PT model was most accurate, followed by the BH model. At annual scale, the PT model worked best, with an MAE of 35.78 mm/a and an nRMSE of 4.93%, whereas the mass transfer-based Roh model was least accurate, with an MAE of 340.18 mm/a and an nRMSE of 37.82%.【Conclusion】Among the eight models we compared, the Priestley-Taylor model is the most accurate simplified method for estimating ET0 in arid oasis regions where meteorological data for the FAO-56 PM model are incomplete or limited. |
| Key words: reference crop evapotranspiration; arid oasis region; applicability evaluation; Shihezi |
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