基于加密自动气象观测站的柳州市短时强降水 时空特征分析

利用柳州市2010-2019年75个加密自动气象观测站小时降水资料，分析柳州市1h、3h、6h短时强降水时空分布特征。结果表明：短时强降水出现最多的是融安、融水一带以及鹿寨北部，山脉的迎风坡和喇叭口地形更利于短时强降水的出现；高发期在5、6月份，其次是7、8月份；短时强降水的日变化呈现单峰结构，主要出现在夜间和早晨时段。该区域短时强降水时空分布特征差异显著，与影响系统、地形的辐合抬升作用以及局地热力条件差异有关。

The Analysis of Short-time Heavy Rainfall Spatio-Temporal Characteristics in Liuzhou Based on the Dense Automatic Weather Stations

Based on the hourly precipitation data of 75 dense observations from automatic weather stations in Liuzhou from 2010 to 2019, the spatio-temporal characteristics of short-time heavy rainfall are investigated. The results indicate that, short-time heavy rainfall happens most frequently in Rongan and Rongshui and northern Luzhai. The windward slopes of the mountains and the trumpet-shaped topography are more conducive to the appearance of short-time heavy rainfall. Short-time heavy rainfall activity reaches high occurrence in May and June, followed by July and August. The diurnal variation of short-time heavy rainfall shows a single-peak distribution, which mainly appears at night and the morning.There are significant differences in the spatio-temporal distribution characteristics of short-time heavy rainfall in this area, which are related to the influence of the system, the convergence and uplift of the topography, and the differences in local thermal conditions.