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利用1978特枯年、2000～2006年长江中下游宜昌、汉口、大通、城陵矶及湖口等水文实测资料,对2006年长江中下游出现特大枯水水情条件下的径流变化和江、湖与水库的调节过程进行分析。结果表明:长江中下游径流变化出现洪季不洪、枯季不枯特征,洪季来水量不到平常年的60%～70%,枯季基本维持平常年的来水量;其中长江上游来水量急剧减少是造成长江中下游洪季不洪的主要因素,三峡在枯水期间的调蓄对维持长江中下游干流的水量有一定的贡献,洞庭湖与鄱阳湖两大湖泊在枯季因干流水位显著降低形成的胁迫效应是长江中下游枯季不枯的重要因素。
Based on the hydrological data of Yichang, Hankou, Datong, Chenglingji and Hukou in the special dry years of 1978 and the middle and lower reaches of the Yangtze River from 2000 to 2006, Lake and reservoir regulation process analysis. The results show that the runoff in the middle and lower reaches of the Yangtze River does not flood during the flood season, but it is not dry in the dry season. The flood season is less than 60% ~ 70% of that in the normal years, and the water inflow in the normal season is basically maintained in the dry season. The drastic reduction is the main factor that causes the flood season in the middle and lower reaches of the Yangtze River to be non-flood-prone. The Three Gorges storage during the dry season has a certain contribution to maintaining the amount of water in the middle and lower reaches of the Yangtze River. The two main lakes in Dongting Lake and Poyang Lake Reducing the formation of stress effects is an important factor in the dry season in the middle and lower reaches of the Yangtze River.