Abstract: | Using the daily and hourly precipitation data and Micaps data of 6 national stations and 77 regional stations in Anshun city from 2009 to 2019, the spatial and temporal distribution characteristics and physical quantities of heavy rainstorms in anshun were analyzed. The results showed that the annual average number of days of heavy rainstorms in anshun was 10.1d, and the annual average impact range was 54.1 stations.From may to September, heavy rainstorms occur in a concentrated period. In June, heavy rainstorms occur with the highest frequency and the widest impact range.The main period of heavy rainstorms and the period of the strongest impact occurred in the night to morning; Regional heavy rainstorms appear later and end earlier than local heavy rainstorms. June is the month with the most regional heavy rainstorms and local heavy rainstorms, and the frequency of local heavy rainstorms is the highest from may to July. In anshun, there were mainly one-day heavy rainstorms, and only 16 heavy rainstorms lasting more than 2d occurred.The spatial distribution of the total number of heavy rainstorm days has two high-frequency regions and two low-frequency regions, and the spatial distribution of the total rainfall is basically consistent with the total number of heavy rainstorm days. Not only the spatial distribution of rainfall intensity is strong in the south and weak in the north, but also the spatial distribution of the number of heavy rainstorm stations is more in the south and less in the north.In particular, more attention should be paid to the analysis of T85 and T75 when severe rainstorms are forecast in May. In addition, the requirements for energy and moisture content in the middle and lower layers are higher than those in other months when heavy rainstorms occur in June and July. |