To study the climate change background of"Peach Blossom Flood"precipitation in Nujiang Prefecture,Yunnan Province,this article uses the hourly rainfall data from four national meteorological stations and 25 township weather stations in Nujiang Prefecture from January to May in 2011-2020 to analyze the spatial and temporal distribution characteristics of hourly precipitation in Nujiang Prefecture in detail by the method of conventional mathematical statistics.The results show that precipitation during the"Peach Blossom Flood"in Nujiang Prefecture occurs mainly in Gongshan and Fugong counties,but also appears in the western part of Lushui City and the northwestern part of Lanping County.The"Peach Blossom Flood"rainfall accounts for about 30％～60％of the annual rainfall.The rainfall amount,rainfall duration,average hourly rainfall intensity,night rainfall amount and other characteristics during the"Peach Blossom Flood"vary significantly,sharing the spatial distribution features of more(stronger)in the north,less(weaker)in the south,more(stronger)in the west and less(weaker)in the east,respectively.The accumulated precipitation during the"Peach Blossom Flood"is jointly influenced by the precipitation duration and hourly rainfall intensity,of which Gongshan and Fugong are most strongly impacted by the precipitation duration,while the localized areas of Fugong and Lushui are mainly affected by rainfall intensity.The diurnal variability of the"Peach Blossom Flood"precipitation is mainly characterized by"single peak and single valley",with peak value occurring in the second half of the night and valley in the late morning.The proportion of night rain is 55％.The"Peach Blossom Flood"rainfall also has the features of more in the north,less in the south,and more in the west and less in the east for the short,medium,long,and ultra-long duration precipitation.Lushui and Lanping are dominated by short-,medium-and long-duration precipitation,while Gonshan and Fugong have the largest contribution from ultra-long precipitation.In short,during the"Peach Blossom Flood",steady and systematic precipitation is dominant with a low occurrence of short-time severe precipitation.
NETL
NSTL
万方数据
