三峡水库运行后对洞庭湖防洪和生态的思考

三峡水库运行后，对洞庭湖区的显著作用：一是泥沙源将大幅度减少；二是降低了防洪压力；三是三峡水库听内下泄量的增减对湖区生态环境有利亦有弊。阉实的资料论证了三峡水库运行后，洞庭湖将成为饥型湖泊，而未淤积湖内的泥沙将转移淤积到城陵矾至汉口河段，使江水、湖水顶托加剧，从而产生断的变化。此外，建议恢复嘉鱼县九宫湖－樊口这条一万年前的古长江河道，作为三峡水库的配套工程。

Management of Land Reflections on Flood Control and Ecology of Dongting Lake After Operation of the Three Great Gorges Reservior

Three effects on Dongting Lake will b e prominent after the operation of th e Three Great Gorges Reservior,that is,firstly,greatly reduce the source of silt,le ngthening the life of the lake;secon dly,decrease the pressure of flood c ontrol while exerting a limited effect on catastrophic floods;finally,the annual increase or decrease of the reservior' s downflow will have both advantange s and dis-advantages for the eco -environment of the lake.With abundant materials the author demonstrates that after t he operation of the reservior Dongting Lake will be a starved lake.Meanwhile,silt not deposited in the lake will be transferred to the reach es from Chenglingji to Hankou,leading to new changes.The p aper also suggests the recovery of an cient course of Changjiang River fro m Jiugonghu to Fankou as an auxiliary project with the Thre e Great Gorges Reservior.