By using statistical analysis and trend analysis methods,comparative analysis of the back-flow characteristics of Poyang Lake before and after the operation of the Three Gorges Project has been made.The results indicate that: 1.The annual days and annual total amount of the back-flow in the period from 2003 to 2008(at beginning of operation) were significantly increased by comparison with the period from1990 to 2002(before the operation of Three Gorges Project),while both was significantly decreased since the 175m trial impounding of Three Gorges Project in 2009;2.In inter-annual variation,the period from 2002 to 2009 had the highest frequency of back-flow;in annual distribution variation,the maximum back-flow in July,October and November obviously decreased after the operation of Three Gorges Project,while obviously increased in August and September;3.The results of M-K trend test indicate that the average annual flow and annual amount of back-flow has no significant change.%采用统计分析和趋势分析等数理统计分析方法,对三峡工程运行前后鄱阳湖的倒灌特性开展对比分析.研究结果表明:① 较三峡工程运行前的1990~2002年,三峡工程运行初期(2003~2008年)年均倒灌天数和年均总倒灌量均有明显的增加,而三峡水库175 m试验性蓄水(2009年)以来二者均显著减小;② 年际变化方面:2002~2009年期间倒灌发生的频率最高;年内分布方面:三峡工程运行后7月、10月、11月最大倒灌流量均出现了较为明显的减少,而8月和9月则出现了较大增幅;③ M-K趋势检验结果表明,年均流量和年倒灌量均未出现显著变化.
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