ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
The spatio-temporal variation characteristics of short-term heavy rainfall in Wuhan from 1954 to 2022
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Abstract:
Short duration heavy rainfall is an important unstable factor affecting the safe operation of the city. Based on the minute by minute precipitation observation data from Wuhan National meteorological station since 1950s, the sliding accumulation method was used to identify short-duration heavy rainfall events, and the rain pattern of a single rainfall event was determined by fuzzy identification method, and the fuzzy identification method is used to determine the rain pattern of every single rainfall event. In addition, the temporal and spatial characteristics of short-duration heavy rainfall in Wuhan were systematically analyzed from the aspects of occurrence frequency, intensity and rain type, and preliminarily explore the influence of urbanization on short-duration heavy rainfall . The results show that: From 1954 to 2022, the short-duration heavy rainfall events in Wuhan showed an increasing trend, which suggests that the annual frequency of heavy rainfall , annual heavy rainfall , annual maximum 60-minute heavy rainfall and annual maximum single heavy rainfall were respectively 6.9 times, 289.9mm, 98.0mm and 282.2mm, while the increasing rates were 0.3 times /10a, 16.7mm/10a, 1.4mm/10a and 0.9mm/10a, respectively. However the changing trends did not pass the 95% confidence test. Among them, the frequency and amount of annual heavy precipitation exhibit interdecadal characteristics, approximately presenting a "W" shape of "decrease increase decrease increase".The incidence and contribution rate of heavy rainfall lasting 60~120 minutes were the largest, 41.6% and 32.2%, respectively. Heavy rainfall in Wuhan mainly occurs from late June to mid-July, accounting for 33.6% of the whole year. The peak of the average minute heavy rainfall frequency occurred at 05:11-05:40, and the trough occurred at 15:58-16:47. Nevertheless, the main peak of the average minute rain intensity appeared in 16:04-17:34, and the trough could be found in 07:53-08:27. The average rain intensity during the day was greater than that at night, especially during 14-20. The average frequency of peaks and valleys per minute in spring is earlier than the annual average.In terms of individual rain patterns, the heavy rainfall at each station in Wuhan was dominated by the type Ⅰ and type Ⅳ rain patterns, while the heavy rainfall in 0-60 minutes was dominated by the type Ⅰ and type Ⅲ rain, and the heavy rainfall in more than 180 minutes contributes the most to the type IV heavy rainfall . Urbanization also played an important role in increasing the frequency and duration of heavy rainfall in Wuhan city to a certain extent, and further increased the heavy rainfall .
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