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洞庭湖自1524年荆江河段尽堵北岸穴口,又经1860、1870年长江两次特大洪水,冲决藕池,松滋两口,形成四口南侵的格局以来,每当汛期,长江洪水挟带大量泥沙倾泻入湖,洞庭湖单独承担了云梦泽的作用,经历了一个由小变大又由大变小的艰苦历程,泥沙淤积,由量变到质变,湖面日蹙,湖容锐减,洪枯水位不断抬高,洪渍灾害频仍,现已进入衰老期,日近消亡。湖区的问题既由长江所带来,其出路主要在于三峡建库,高坝拦洪,遏制水沙,并配合已有的防洪工程体系,庶几可达到根治的目的。
Dongting Lake from the 1524 Jingjiang reach to block the north bank hole, but also by 1860, 1870 Yangtze River two extraordinary floods, rushed Ouchi, Song Zi two to form a pattern of four south invasion, whenever the flood season, the Yangtze River flood with a large amount of Sediment pouring into the lake, Dongting Lake alone assumed the role of Yunmeng Ze, went through a difficult process of small to large and from large to small, sediment deposition, from quantitative change to qualitative change, the lake sundial, sharp reduction in the lake , Floods continue to raise the level of flood disaster frequently, now entered the aging period, the recent demise. The issue of the lake area is brought about by the Yangtze River. Its outlet lies mainly in the construction of reservoirs in the Three Gorges Dam, flood control of high dams, and control of water and sediment. In addition, with the existing flood control project system, it is possible to achieve the goal of radicalization.