Spatio-temporal Variation Characteristics of Hourly Precipitation in Rainy Season in Qiannan from 2010 to 2021
Based on the hourly precipitation data of 46 automatic weather stations in QianNan from April to September in 2010-2021,this paper analyzes the spatial and temporal variation characteristics of precipitation intensity,precipitation amount and frequency by using the synoptic and statistical methods.The results show that,during rainy seasons,there are four large-value centers of precipitation located in the four regions of Libo,Duyun,Changshun and Guiding with precipitation all exceeding 1,100 mm.Except for Libo,the precipitation in the other three regions accounts for more than 80％of the annual total precipitation.The frequency and intensity of short-time heavy precipitation in the area east of Luodian are even higher.Compared to the duration of precipitation,the precipitation in rainy season is more affected by the precipitation intensity,and the local characteristics are significant.Divide Qiannan into 4 regions,the short-time heavy precipitation in the four regions is easy to occur in the afternoon and the first half of the night.The diurnal variation characteristics only show a multi-peak precipitation intensity,and the other two indicators are basically of single-peak type.The peak precipitation in Region 2 appears the earliest,and the precipitation intensity in Region 3 is the strongest,while Region 4 has the largest precipitation amount and frequency.In conclusion,the large-value centers of precipitation in the rainy season in QianNan are scattered,with obvious local characteristics.Most areas are affected by precipitation intensity more.The short-time heavy precipitation in the four regions is concentrated in the afternoon and the first half of the night.The frequency and precipitation peak reach the maximum from west to east with time.The precipitation intensity is the strongest in the east,but the lasting time of precipitation is short.The situation in the west is opposite to that in the east.
precipitationprecipitation intensityprecipitation frequencyshort-time heavy precipitation
NETL
NSTL
万方数据
