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《Resources and Environment in the Yangtze Basin》 2010-11
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RESEARCH ON EXTREME PRECIPITATION EVENT CHARACTERISTICS OF XIANGJIANG RIVER BASIN IN RECENT 48YEARS

XIAO Yan1,LI Zu-xian2,ZHANG Xin-ping1,ZHOU Jian-jun3 (1.College of Resources and Environment Sciences,Hunan Normal University,Changsha 410081,China; 2.Hunan Meteorological Observatory,Changsha 410007,China;3.Hunan Climatic Centre,Changsha 410007,China)  
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.
【Fund】: 国家自然科学基金项目“我国西南地区降水中稳定同位素的代表性及影响机制研究”(40871094);; 湖南省重点学科建设项目(2008001)
【CateGory Index】: P468.024
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