长江口北港河势演变趋势及工程影响分析  

Study on evolution trend of North Channel of Yangtze River Estuary and influences of related projects

作　　者：刘玮祎[1] 唐建华[1] 缪世强 

机构地区：[1]长江水利委员会设计院上海分院,上海200439

出　　处：《人民长江》2011年第11期39-43,共5页Yangtze River

基　　金：长江勘测规划设计研究院科研与技术创新项目"长江河口三维水流;泥沙;盐度数学模型研究"(CX200830)

摘　　要：为研究20世纪末以来,长江口北港上口通道的河势变化及重大工程的影响,对北港历年-5 m和-10m等深线变化、主泓线变化、典型断面形态变化进行分析。结果表明:北港主槽与其分流比存在一定程度的正相关性;20世纪末以来,北港上口分流通道相对稳定,但呈不断下移、逆时针偏转态势;北港逐步向单一河槽方向演变,主槽将恢复为上段偏北、下段偏南的微弯河道形态。分析结论说明:中央沙、青草沙工程的建成有利于继续维持北港这种发展态势,并使其在经过一段时间的调整后达到新的冲淤平衡。In order to study the evolution of the North Channel of the Yangtze River Estuary since the end of 20th century and the influences of related projects on river regime,we analyzed the variation of depth contour（-5 m and-10 m）,thalweg and typical section morphology in the past years.The results show that there is a positive relationship between the scale of the main channel and diversion ratio of the North Channel;the entrance channel in the North Branch is relatively stable,while it is moving southward and deflected in an anti-clockwise direction.The North Channel will develop into a single channel gradually and its main channel will be a slight meandering pattern with the upper reach moving northward and the lower reach southward.The analysis of the influences suggests that the construction of Zhongyangsha and Qingcaosha projects would benefit the keeping of this evolution trend in the North Channel,and the new balance of souring and silting will be obtained after the a period of adjustment.

关 键 词：演变趋势 工程影响 长江口 北港 

分 类 号：TP147[自动化与计算机技术—控制理论与控制工程]