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| Impact of temporal rainfall resolution on SWAT hydrological simulation |
| LU Yang1, TU Jun1,2, GAO Zheng-guo1, LI Xiao-gang1, YANG Shuai1, YANG Xiao-ying1,3 |
1. Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China;
2. Shanghai Fudan Planning Architectural Design and Research Institute Co., Ltd., Shanghai 200433, China;
3. Nanjing Hydraulic Research Institute, Nanjing 210029, China |
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Abstract Respectively based on the daily and hourly rainfall of 13rainfall stations, this paper has independently established, calibrated, and validated SWAT (Soil and Water Assessment Tool) models in the Shuaishui river basin. On the basis of this, the impact of temporal rainfall resolution on SWAT simulation performance in the Shuaishui river basin has been analyzed. Results have shown that the temporal resolution of rainfall input has a significant impact on the hydrological simulation performance of SWAT in the Shuaishui river basin. The Nash coefficient (NSE) and coefficient of determination (R2) of the SWAT model based on hourly rainfall are respectively 0.89and 0.90during calibration, and 0.86and 0.88during validation, which are all considerably higher than the corresponding model evaluation statistics of the SWAT model based on daily rainfall. This is mainly due to the significantly better performance of the SWAT model with hourly rainfall input in simulating peak flow than the SWAT model with daily rainfall input. It is suggested that similar study of the impact of temporal rainfall resolution on the simulation performance of hydrological models should be systematically carried out in watersheds with different climatic and environmental conditions.
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Received: 10 April 2020
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