长江口北支近期水沙特性及河道演变特征  

Recent flow-sediment characteristics and riverbed evolution of North Branch of Yangtze River estuary

作　　者：陈正兵 陈前海 谢作涛 

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010 [2]长江水利委员会建设与管理局,湖北武汉430010

出　　处：《人民长江》2016年第23期5-9,共5页Yangtze River

基　　金：国家科技支撑计划"长江口北支改善平面形态治理技术研究"(2013BAB12B04);国家科技支撑计划"长江口北支水沙盐输运模拟技术研究"(2013BAB12B03)

摘　　要：根据近年来长江口北支实测水文地形资料,分析了2001年后北支的水沙特性、岸线、深泓线、等高线和河床冲淤等变化情况。分析结果表明:近年来长江口北支分流比的变化趋缓,含沙量和床沙粒径沿程变化有一定的规律;岸线变化集中在三和港至启东港段,岸线缩窄率超过50%;深泓变化集中在进口至大洪河、大新河至三和港,进口深泓呈现崇头→海门港→崇头变动;崇头至灵甸港段深槽呈弯曲河道特征,灵甸港以下河道顺直展宽;河槽总体表现为淤积,其中,崇头至大新河段深槽冲刷边滩淤积,三条港至连兴港段的深槽基本不变,边滩淤积。总体来看,北支的淤积集中在主流变动段、凸岸边滩与崇明北缘边滩,而冲刷则集中在深槽、弯道凹岸与整治工程前沿。Based on recent bathymetry and hydrological observation data of North Branch of Yangtze River estuary, this paper analyzed the change of flow -sediment characteristics, shorelines, thalweg, contour and riverbed since 2001. The results show： the flow diversion ratio of North Branch changed slowly; the suspended sediment concentration and particle size of bed material regularly changed along distance. The change of shoreline concentrated at Sanhe Port and Qidong Port with the ratio of river width narrowing over 50%. The main change of thalweg was at the inlet to Dahong River and Daxin River to Sanhe Port. The inlet thal- weg shifted from Chongtou to Haimen Port and then back to Chongtou. The main channel from Chongtou to Lingdian port presents a meandering characteristic. The channel at downstream of Lingdian port is straight and broadening. The overall riverbed has a general trend of deposition, namely the main channel from Chongtou to Daxin River is scoured with point bar deposited, and the main channel from Santiao Port to Lianxing Port section remains unchanged with the point bar deposited. Generally, the deposi- tion occurs at the mainstream varied zone, point bar of convex bank and Chongming north rim, while the erosion occurs at main channel, concave bank and leading edge of regulation works.

关 键 词：河道演变 泥沙 河势 长江口北支 

分 类 号：TV85[水利工程—水利水电工程]