博罗县暴雨的时空分布特征

利用博罗国家气象站1960—2019年逐日降雨资料和乡镇区域气象监测站2013—2019年逐日降水资料研究博罗县暴雨气候特征,结果表明:近60年博罗暴雨日数和暴雨量均呈波动增加趋势,年平均暴雨日数和暴雨量分别为8.1 d和676.6 mm,暴雨日数月变化呈双峰型分布,暴雨日数存在5~12和2~3年的显著周期;连续性暴雨日数占暴雨总日数的23.8%,2007年出现了最长的连续5 d暴雨,暴雨初日多在3月30日—5月13日出现,暴雨终日多在8月11日—10月15日出现。

On the Spatiotemporal Distribution Characteristics of Heavy Rain in Boluo County

The data of daily rainfall from a national meteorological station in Boluo from 1960 to 2019 and from a number of regional meteorological monitoring stations at individual towns from 2013 to 2019 are used to study the climatological characteristics of heavy rain in the county.The result is shown as follows.For the 60 years studied,both the annual number of heavy rain days and annual rain amount show a fluctuating increasing trend,which is 8.1 d and 676.6 mm,respectively.The number of heavy rain days is bimodal in monthly distribution and is marked with two significant periods at 5 to 12 years and 2 to 3 years.The number of persistent heavy rain days takes up 23.8%of the total number of heavy rain days.A heavy rain lasted as long as 5 d in 2017,the longest of all in the years studied.The first day of heavy rain is mostly between March 30 and May 13 while the last day of heavy rain is usually between August 11 and October 15.