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| DOI：10.13522/j.cnki.ggps.2023201 |
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| Simulation research of reference crop evapotranspiration based on ANFIS in Fenhe basin of China |
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GE Jie, LIU Yuan, LUO Shuqi, CAO Qixin
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1. Power China Northwest Engineering Corporation Limited, Xi’an 710065, China;
2. Shaanxi Provincial Water Ecological Environment Engineering Technology Research Center, Xi’an 710065, China;
3. Northwest A&F University, Yangling 712100, China
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| Abstract: |
| 【Objective】In order to effectively improve the calculation accuracy of reference crop evapotranspiration(ET0) in Fenhe basin,【Method】Daily meteorological data in the past 58 years (1960—2017) were collected from seven meteorological stations in Fenhe basin and it’s vicinity. According to the combinations of different meteorological elements, 16 ET0 calculation models were built based on adaptive network-based fuzzy inference system (ANFIS), and were compared with Hargreaves-Samani, Irmark-Allen and Makkink, which applicability were evaluated. 【Result】①The non-linear relation between ET0 and each input factor can be well displayed by ANFIS model. The simulation accuracy of ANFIS2 model established by only inputting Tmax, Tmin and Ra can meet the usage requirements (R2=0.882, NSE=0.876, RMSE=0.341 mm/d). With the increase of meteorological elements, the simulation accuracy of ANFIS model was improved. ②The simulation accuracy of ANFIS model was higher than that of Hargreaves-Samani, Irmark Allen, and Makkink models when same input condition. ③The ANFIS model had strong generalization ability and portability in the Fenhe basin. High accuracy was shown in mutual portability of ANFIS models established in different zone (R2=0.983, NSE=0.978, RMSE=0.134 mm/d).【Conclusion】Therefore, the model based on adaptive network-based fuzzy inference system (ANFIS) can be used as a recommended model for the calculation of ET0 in the Fenhe basin in the absence of meteorological data, which can provide a technical support for the efficient utilization of agricultural water resources in the Fenhe basin. |
| Key words: Fenhe basin; reference crop evapotranspiration(ET0); ANFIS; portability |
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