Spatial and temporal distribution of heavy precipitation in Yichang City from 2012 to 2021
To further understand the characteristics of the heavy precipitation in Yichang City,the spatio-temporal distribution of the three types of heavy precipitation,namely 1 h,3 h,and 24 h,and the precipitation extremes were analyzed by using mathe-matical statistics based on hourly precipitation data of 358 meteorological stations in Yichang City from 2012 to 2021.The results showed that:① The seven rainstorm centers in Yichang City usually appeared in the windward slope zone where the plain transits to hills or mountains,and the area along the river.The 24-hour long-duration accumulated rainstorm in the south was more than that in the north,and it was concentrated in the south of the Changjiang River.The 3 h short-duration rainstorm was obvious in the north of the Changjiang River.② The frequency of hourly heavy precipitation above 20 mm/h and 30 mm/h was 3.8 times and 1.3 times per year,respectively.The frequency of 3 h short-duration rainstorms and 24 h long-duration accumulated rain-storms was 1.0 times and 4.9 times per year,respectively.The years of the most frequent hourly heavy precipitation and 3 h short-duration rainstorms were 2016,2018,and 2020.The years of the most frequent 24 h long-duration accumulated rainstorms were 2020 and 2016.③ The monthly variation of three types of heavy precipitation showed an unimodal pattern,with the main flood season from June to August being the peak period for heavy precipitation.The diurnal variation of hourly heavy precipitation showed a bimodal pattern,with the high-frequency hourly heavy precipitation concentrated from 13:00 to 04:00,and peak peri-ods from 17:00 to 19:00 and 23:00 to 24:00.④The spatial distribution of three types of heavy precipitation extremes in Yichang City varied greatly,with 1 h precipitation extremes and 3 h precipitation extremes were higher in the center-east than that in the west,and 24 h precipitation extremes in the center-south were higher than that in the north.Areas with high precipitation ex-tremes mainly appeared in Xiaoxita Street and Letianxi Town in Yiling County,Jiuxian Town in Yuanan County,Herong Town in Dangyang City,Gaobazhou Town and Niejiahe Town in Yidu City,and Wantan Town in Wufeng County.The maximum precipitati-on in Yichang City for 1 h,3 h,and 24 h were 158.8,211.9,and 363.6 mm,respectively.These results can provide references for the classified heavy precipitation forecasting and warning in Yichang City.
heavy precipitationspatio-temporal distributionpeak periodsprecipitation extremesYichang City
国家科技期刊平台
NSTL
万方数据
