柳州市区短历时强降雨时空分布

Spatial and temporal distribution of short duration heavy rainfall in Liuzhou

利用柳州市2010-2015年24个自动站观测资料,对柳州市区短历时强降雨的时间、空间分布特征以及与年降水量的关系进行分析,结果表明:(1)2010-2015年,柳州市区短历时强降雨的次数呈递增趋势,年际间变化较大;(2)从时空分布看,短历时强降雨最易发生在6月,时段集中在02-06时,发生最大概率的地区在柳州的西南部(柳南区);(3)从短历时降雨和年降水量的关系看,短历时强降雨对年总降雨量有贡献,短历时强降雨次数多,年总降雨量也高。

Based on the observation data of 24 automatic stations in Liuzhou from 2010 to 2015, the temporal and spatial distribution characteristics of short duration heavy rain in Liuzhou and the relationship with annual precipitation were analyzed. The results showed that： 1. From 2010 to 2015, the number of short-duration heavy rain in Liuzhou had an upward trend, and varied among the years; 2. From temporal and spatial distribution, short duration heavy rain most likely occurred in June and concentrated between 02：00hr and 06：00hr, the area with the highest probability of occurrence is the southwest of Liuzhou （Liunan District） ; 3. From the relationship between the short-duration rain and the annual precipitation, the short-duration heavy rain contributes to the total annual precipitation, more short-duration heavy rains, higher total annual precipitation.