汕尾市短历时强降雨的时空分布特征

利用汕尾市2013—2018年间115个自动气象站逐小时降雨量资料,对汕尾地区短历时强降水时空分布特征以及与年总降水量的关系进行研究。分析表明:(1)2013—2018年汕尾市短历时强降雨的次数大体呈递增趋势,各年发生的次数差异较大;(2)短历时强降雨具有明显的季节变化和日变化特征,最易发生在6月,时段集中在下午至傍晚;(3)短历时强降水主要集中在莲花山脉东南侧的海丰县大部及陆丰市东北部,包括莲花山、公平、梅陇、海城、八万等地区;(4)短历时强降雨发生次数多的年份降水量也大,两者具有很强的相关性。

On the Spatiotemporal Distribution Characteristics of Short-range Intense Rains in Shanwei

Using hourly rain amount data from 115 automatic weather stations in Shanwei from 2013 to 2018,this paper studies the spatiotemporal distribution characteristics of short-range intense rains in this region and their relationships with annual total rain amount.The result is shown as follows.(1)In the years studied,the frequency of short-range intense rains shows a generally increasing trend with large interannual variations.(2)The short-range intense rain is marked with significant seasonal and diurnal variations,which is most likely to happen in June and the preferred time of occurrence is from the afternoon to the evening.(3)The short-range intense rain is mainly over most of Haifeng county,which is on the southeast side of the Lianhua Mountains,and northeastern Lufeng city,which includes the towns of Lianhuashan,Gongping,Meilong,Haicheng and Bawan.(4)In the years with more short-range intense rains,annual rain amount is also large,showing strong correlation between them.