In recent years, extreme rainstorms in the Yangtze River Basin have become increasingly frequent. In this paper, by using the daily precipitation data at 670 rainfall stations in the Yangtze River Basin during 1960~2017, the spatial and temporal variation characteristics of rainstorm days and intensity in the Yangtze River Basin in recent 60 years were analyzed. The results showed that the rainstorm areas in the upper Yangtze River were located in the Jiamin River basin, and the rainstorm areas in the middle and lower Yangtze River were located in the Poyang Lake system. The rainstorm days in the upper Yangtze River were obviously smaller than those in the middle and lower reaches, but their intensity was close; The rainstorm areas in the Yangtze River basin moved northwest from April to September, and its location gradually moved from the two lakes to the Jiamin River Basin. The intensity of rainstorm increased first and then decreased from April to September. The strongest rainstorm in the middle and lower Yangtze River occurred in June, while that in the Jiamin River Basin occurred in July; The rainstorm days in the middle and lower Yangtze River increased significantly, while that in the Mintuo River Basin decreased significantly. The variation trend of rainstorm intensity in each water system of the Yangtze River Basin was not obvious, but it in Yuan River - Dongting Lake - the main stream of the lower Yangtze River had a significant increase trend, and it in the Minjiang River system had a significant weakening trend. The rainstorm intensities of 100-year, 50-year and 10-year recurrence intervals were 183, 160 and 112 mm/d in the upper Yangtze River, and 200, 174, 120mm/d in the middle and lower Yangtze River.
Key words
Yangtze River Basin /
rainstorm days /
rainstorm intensity /
recurrence period
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