长江河口主要汊道水流挟沙能力分析  

Preliminary study on sediment-carrying capability in main inlets of Yangtze Estuary

作　　者：黄惠明[1] 王义刚[1] 

机构地区：[1]河海大学海岸灾害及防护教育部重点实验室,南京210098

出　　处：《水道港口》2007年第6期381-386,共6页Journal of Waterway and Harbor

基　　金：国家自然科学基金重点项目"长江流域调水等工程对河口环境的影响及对策"(50339010)

摘　　要：在分析长江河口水文泥沙挣性的基础上，统计了河口南北支、南北港等汉道河段的悬沙中值粒径值。结果表明，长江河口悬沙较细，悬沙中值粒径变化范围不大，在0．006～0．014mm之间，在大中小潮过程中各个汊道河段的变化也不大，其中值粒径平均约为0．008mm。同时从单向水流的挟沙能力出发，引入背景含沙量，对长江口的水流挟沙能力关系进行了探讨。在此基础上，结合数值积分的处理方法及枚举法，对样本数据作物理意义上的涨、落半潮积分平均的处理，并进一步以此推求了长江口南北支、南北港等主要汉道河段的水流挟沙能力。Based on analysis about hydrologic and sedimentary characteristics of Yangtze Estuary, statistics about median grain size of suspended sediments is carried out. And the result shows that suspended sediments is rather fine, median grain size general varies between 0. 006 - 0. 014 nun, and the mean value of median grain size is about 0.008 nun. Mean while, based on sediment - carrying capability of unidirectional flow and the concept of background sediment concentration, preliminary study on sediment - carrying capability of Yangtze Estuary is carried on. Then combining numerical integral method and enumerative method, field data are disposed according to integral means of flood - tide and ebb - tide within physical means, finally, sediment-carrying capability of south - north branch and south-north channel in Yangtze Estuary is deduced.

关 键 词：挟沙能力 背景含沙量 半潮平均 长江口 

分 类 号：TV143.4[水利工程—水力学及河流动力学]