长江中游持续暴雨期中尺度降水系统的统计分析

THE STATISTICAL ANALYSIS OF MESO-SCALE SYSTEMS DURING THE PERSISTANT TORRENTIAL RAIN OVER THE MIDDLE REACHES OF CHANGJIANG RIVER

该文选取长江中游地区的湖北、湖南和江西三省的１６４个气象台站的每小时雨量资料，对８０年代７次大范围持续暴雨期间的中尺度系统的活动进行统计研究。选用雨峰分析法共分析出１６５次中尺度系统，对其源地、路径、移速、生命史及日变化特征进行统计分析；并用Ｆ分布函数拟合和讨论了中尺度系统降水的１小时雨强的概率特征。

Using hourly rainfall data at 164 weather stations over Hubei,Hunan and Jiangxiprovinces located in the middle reaches of Changjiang River,the statistical analyses ofmeso-scale systems for seven large scale and pt1rsistant torrential rain events in 1980s’are made. The rain-peak analysis method is available for use,and 165 meso-scalesystems are captured. The original regions,moven1t4nt tracks,and speeds,life cycle andthe daily variation of the systems are analysed.Furthermore,the probabilitycharacteristics of rainfall intensity per hour for the systems are fitted and discussed byΓ-distribution function.