中文摘要：

为探究长江干流枯水期极端流量的变化特征,采用最小1、3、7、30、90 d流量指标表征枯水期水文情势,两相线性回归检验法和非参数检验Mann-Kendall法分别检测枯水期极端流量序列的突变和趋势。结果表明宜昌站主要受三峡水库影响,各历时极端流量序列所检测出的显著突变年份均为2002年,突变后流量序列呈显著上升趋势;大通站距离三峡水库较远,受沿程支流汇入及河道调蓄等影响,各历时极端流量序列均未检测出显著突变年份,流量序列整体呈显著上升趋势,可为长江枯水期水资源调配提供一定的参考依据。

英文摘要：

For revealing the variation characteristics of the extreme flow of the Yangtze River in the dry season, the paper uses annual minimum 1-day, 3-day, 7-day, 30-day, 90-day mean flow were analyzed as the features of hydrological regime in dry season.The analysis of abrupt behaviors and tendency of the extreme flow sequences in dry season respectively use the two-phase regression scheme method and Mann-Kendal method. The results indicate that the Yichang station＇s extreme flow sequence of all duration have significant abrupt behavior in 2002 with the influence of the Three Gorges Project, and the trend of extreme flow sequence after 2002 are significantly upward. Datong station is affected by tributaries and river regulation which due to further position from the Three Gorges Project, therefore the abrupt behaviors of the extreme flow sequence of all duration are not significant, and the trends of the whole extreme flow sequences are significantly upward. The research can offer a reference about water resource scheduling of the Yangtze River in the dry season.