广西暴雨过程雨团时空分布特征研究

Temporal and Spatial Distributions of Rain Cluster about the Rainstorm Process in Guangxi

利用常规观测、雷达探测和自动站资料对广西近3年暴雨过程中的雨团进行定义分类,并对其时空分布的特征进行研究,得到以下结果。1雨团可分为锋面、暖区和台风雨团三种类型。2锋面雨团主要分布在桂林、柳州、河池等地,其中恭城县龙虎乡是出现雨团频数最多的中心;暖区雨团受地形地貌影响较大,主要分布在桂东北山区、水库及桂南沿海地区,最大频数在兴安猫儿山;台风雨团也受地形地貌影响较大,桂南沿海地区出现频次较高,以防城为高值中心,最大在垌中镇。武鸣大明山是次大值中心。3锋面雨团多出现在后半夜至上午,其中桂北、桂中在后半夜出现的频率高,而桂南在白天出现的频率高;暖区雨团多出现在白天,其中桂南、桂中、桂北分别在下午、前半夜、后半夜出现的频率高;台风雨团多出现在下午至前半夜,其中桂北在前半夜、桂中在下午至前半夜出现的频率高,桂南差别不大。

Using conventional observation,radar and automatic station data,the definition,classification and the temporal and spatial distributions characteristics of the rain cluster in recent 3 years in the rainstorm process in Guangxi are studied,the results show that： 1 Rain cluster is divided into three types： frontal rain cluster,warm region rain cluster and typhoon rain cluster. 2 The frequency regions of the frontal rain cluster are mainly distributed in the Guilin,Liuzhou,Hechi. Long Hu town in Gong Cheng county is the rain cluster center appeared the most times; The warm region rain cluster,which is more effected by topography,mainly distributes in the mountain areas and reservoir in Northeast and the southern coastal region of Guangxi. The maximum frequency appears at Maoer Mountain in Xing An country. The typhoon rain cluster also is more affected by terrain and landform. Higher frequency appears in the southern coastal region of Guangxi. Fang Cheng region is the higher center. The maximum appears at the Dong Zhong town. Da Ming Mountain in Wu Ming country is the second largest value center. 3 The frontal rain cluster more appears after midnight to morning. The northern and middle areas of Guangxi after midnight and south areas in the daytime appear in high frequency. The warm region rain cluster more appears during the daytime. The southern,middle and northern of Guangxi respectively in the afternoon,before midnight and after midnight appear in high frequency. The typhoon rain cluster more appear in the afternoon to night. The northern and middle of Guangxi respectively before midnight and in the afternoon to before midnight appear in high frequency. There is little difference in southern Guangxi.