期刊
HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES
卷 65, 期 15, 页码 2630-2645出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02626667.2020.1836374
关键词
temporal rainfall resolution; hydrological simulation; daily streamflow; scale effect; rainfall characteristics; SWAT
资金
- National Key Research and Development Program of China [2016YFA0601501]
- National Natural Science Foundation of China [41830863, 51679144]
- Belt and Road Special Foundation of the State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering of Nanjing Hydraulic Research Institute, China [2018nkzd01]
Compared to spatial resolution, few studies have investigated the impacts of temporal rainfall resolution on hydrological modelling. Respectively using 9 years of daily and hourly rainfall data at 24 stations, we have established daily and hourly rainfall Soil and Water Assessment Tool (SWAT) models in a large-sized river basin in East Central China. Our results suggest that temporal rainfall resolution could significantly affect SWAT daily streamflow simulation results, with the hourly rainfall model performing considerably better than the daily rainfall model. One possible reason is that the hourly rainfall model could more effectively capture the impacts of rainfall in previous days, especially those with heavy rainfall and longer rainfall hours. Meanwhile, its enhanced variable storage coefficient method may lead to better streamflow routing. Furthermore, comparison of simulation results across all sub-basins has revealed a distinct scale effect in the impact of temporal rainfall resolution on SWAT simulation performance.
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