长江与洞庭湖关系变化初步分析

长江中游枝城至城陵矶河段称工南岸洞程有松滋口、太平口、藕池口和调弦口分流入洞庭湖，洞庭湖又集湘、资、沅、澧四水经湖区调节后于城陵矶汇入长江，形成了复杂的江湖关系。受自然的和人为的因素影响，江湖关系不断地发生调整变化，这直接关系到长江和洞庭湖的演变及其治理，因此，深入分析江湖关系变化的规律及其影响，对研究三峡工程修建后江湖关系调整趋势于江、湖的治理均有重要意义。实测资料分析有松滋口近几十年来，长江与

Preliminary analysis on variation of the relation between Yangtze river and Dongting lake

The Zhicheng Chenglingji stretch of middle Yangtze river is called Jingjiang river.Along its south bank there are four entrances,i.e,Songzhikou,Taipingkou,Ouchikou and Tiaoxiankou(at this entrance a control sluice was built in 1959),diverting flow into Dongting lake,in addition,the flows of four rivers,Xiang river,Zhi river,Yuan river,Li river,converge in Dongting lake and after lake regulation discharge into Yangtze river at Chenglingji,forming a complicated relation between the river and the lake.Influenced by natural and human activities,this relation has been adjusting and changing successively.The adjustment of this relation directly influences on the evolution and harnessing of Yangtze river and Dongting lake.So,thorough analysis of the variation law of this relation and its influence has important signifcance for sketching out the future situation of the river and the lake after completion of TGP.The analysis of the surveyed data demonstrates that for several decades the natural and human activities have exerted a certain influence on the evolution and flood control of Yangtze river and Dongting lake.This paper analyses the variation law of the river lake relation,influence factors and the influence of the relation adjustment on the river and the lake,and indicates that the improvement on Yangtze river and Dongting lake should be studied with more efforts and carried out in accordance with the principle of benefiting both the river and the lake.