摘要
利用2006-2018年南宁市台风暴雨过程的日雨量(20-20时)和小时雨量资料,采用数理统计方法对台风暴雨发生频次、持续时间、最大小时雨量进行分析,揭示南宁市台风暴雨的时空分布特征。结果表明:(1)2006-2018年影响南宁的台风暴雨次数年变化呈减少趋势,月际变化呈单峰型分布,峰值在8月;各月台风暴雨过程平均持续时间在1~3 d之间;各月台风暴雨过程的最大小时雨量呈"W"型分布,峰值出现在6月、9月和11月。(2)南宁市城区及横县既是台风暴雨中心,又是暴雨及大暴雨的高频区;台风暴雨小时最大雨量空间分布呈东北高、西南低,四周强于中间的特征。(3)2006-2018年从Ⅱ类路径进入广西的台风造成南宁市台风暴雨次数最多;台风强度与台风暴雨强度不存在明显的单一关联性。
Based on the daily rainfall(20-20 o’clock) and hourly rainfall data of typhoon rainstorm processes in Nanning from 2006 to 2018, the occurrence frequency, duration and maximum hourly rainfall of typhoon rainstorms were analyzed by mathematical statistical method to reveal the temporal and spatial distribution characteristics. The results showed that(1) the number annual variation of typhoons and rainstorms affecting Nanning from 2006 to 2018 showed a decreasing trend, and the monthly variation showed a single peak distribution, with the peak in August. The average duration of typhoon rainstorm process in each month was between 1 ~ 3 days. The maximum hourly rainfall of typhoon rainstorm in each month showed a "W" distribution,and the peak occurred in June, September and November.(2) Nanning City and Hengxian County were not only the centers of typhoon and rainstorm, but also the high-frequency areas of rainstorm and downpour. The spatial distribution of hourly maximum rainfall of typhoon rainstorm was high in the northeast, low in the southwest, and stronger around than in the middle.(3) From 2006 to 2018, typhoons entering Guangxi from the category II route caused the most typhoon rainstorms in Nanning. There is no obvious single correlation between typhoon intensity and typhoon rainstorm intensity.
作者
黎彦佐
陆丽秋
Li Yanzuo;Lu Liqiu(Nanning Meteorological Observatory,Nanning Guangxi 530029;Debao Meteorological Bureau,Baise Guangxi 533700)
出处
《气象研究与应用》
2021年第3期31-36,共6页
Journal of Meteorological Research and Application
关键词
台风
暴雨
变差系数
typhoon
rainstorm
variation coefficient
