摘要
70多年来,长江口北支渐渐淤积萎缩,分流比减少,并出现水、沙、盐倒灌南支的现象.文章分析了这些现象的起因和发展趋势。
The general form of the North-branch of the Changjiang River mouth has changed greatly due to the change of the main stream lines of the Nantong reach of the Changjiang River and the influence of human activities. By the 1930s,the main stream lines of the Nantong reach of the Changjiang River has shifted to the Tongzhousha west channel.The North-branch at the Changjiang River mouth has become atrophic because of Tongzhousha east channel's deposition.After 1958,Tonghaisha and Jiangxinsha were exploited.And in 1970 the North-branch of Jiangxinsha was blocked up.All these things make the water of the North-branch more difficult to pass through.It leads to the decline of the total discharge percentage of the North-branch.And it causes the rising-tide to go back to the South-branch.However, since 1978,with the development of Tongzhousha east channel and its left bank being scoured,the water amount of entering the North-branch is increasing.And the water, load and salt of going back to the South-branch is becoming less.A series of plans to regulate and exploit the North-branch have been put forward but each one has its weak- point except the plan of making the river channel at Lianxingang narrow,It can prevent the water,load and salt from going back to the South-branch.And at the same time it can also keep up the normal natural and social environment.Undoubtedly,it is the best way to regulate and exploit the North-branch.
出处
《地理科学》
CSSCI
CSCD
北大核心
1993年第4期346-352,共7页
Scientia Geographica Sinica
关键词
河势变化
长江口
泥沙输移
North-branch of the Changjiang River mouth
Change of the general form
Transport of water,load and salt
