RESEARCH ON EXTREME PRECIPITATION EVENT CHARACTERISTICS OF XIANGJIANG RIVER BASIN IN RECENT 48YEARS
RESEARCH ON EXTREME PRECIPITATION EVENT CHARACTERISTICS OF XIANGJIANG RIVER BASIN IN RECENT 48YEARS
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发表时间：
2010
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通讯作者：
Zhou Jian-jun
中科院分区：
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作者：
Zhou Jian-jun
基于湘江流域44个站点近48年逐日降水资料，将第95个百分位定义为各站点的极端降水阈值，同时采用直线回归、突变分析和相似系数等方法，分析了不同等级降水事件的变化特征和时空特征。近48年来，极端降水量有所增加，但在不同时期，极端降水量呈现出不同的变化趋势。1970年代以前，暴雨事件较为频繁。1970年代和1980年代，各等级降水事件均处于相对弱阶段。 20世纪90年代以来，各地降水明显增加，特别是暴雨和大暴雨事件。此外，通过对湘江流域极端降水分布的分析，揭示了区域差异，暴雨事件主要集中在上游，暴雨事件较多在中游，大暴雨事件多在下游。
Based on the daily precipitation data of 44stations in Xiangjiang River Basin during last 48years,the 95th percentile is defined as the threshold of extreme precipitation for each station.At the same time,the changing feature and temporal and spatial characteristics of the different grade rain events were analyzed by using the methods of Line Regression,Abrupt Changing Analysis and Similarity Coefficients.The result showed that every index(precipitation quantity,precipitation days,precipitation intensity,precipita-tion index and daily maximum precipitation)of extreme precipitation increased in last 48years.But in dif-ferent times,the extreme precipitation shows a different changing trend.The heavy rain events were more frequent before 1970s.During the 1970sand 1980s,each grade rain event was in a relatively weak stage. Since the 1990s,all precipitation obviously increased,especially the rainstorm and heavy rainstorm events. Besides,regional difference was revealed by analyzing the distribution of extreme precipitation in Xiangjiang River Basin.Rainstorm events were mainly in the upper reaches;heavy rain events were more in the middle reaches;heavy rainstorm events were in the lower reaches.