摘要
基于2011年12月和2012年6月洪、枯季大潮北港上段河道水域的现场水文观测资料,以及1999、2002、2003、2004、2005、2006、2007、2010年历史水文测验资料,分析潮流历时、流速、优势流和含沙量等水沙现状和变化特征,并探讨近年来该水域水沙变化的主要影响因素。结果表明:(1)目前北港上段河道水域落潮占主导优势;青草沙水库和长江大桥建成后,落潮优势明显增强,洪季大潮涨、落潮垂线平均含沙量减少,枯季大潮涨、落潮垂线平均含沙量增多;(2)流域径流量的季节性变化是造成北港上段河道水域垂线平均流速洪季大、枯季小的主要原因;大型工程的建设是该水域落潮优势增强的主要影响因素;北港上段河道水域含沙量变化可能与近岸工程建设、入海泥沙量减少等因素有关。
The tidal current duration （TCD） and velocity （TCV） and the suspended sediment concentration （SSC） were measured in the dry season in December 2011 and in the flood season in June 2012 in the upper part of the North Channel of the Yangtze Estuary. They were assimilated with the measured data in 2003, 2004, 2006 and 2007, using the tidal range＆#39;s proportion conversion. Variations in TCD and TCV, preferential flow and SSC have been calculated. Influences of typical engineering projects such as Qingcaosha fresh water reservoir, Yangtze River Bridge, and land reclamation on the ebb and flood TCD, TCV and SSC in the North Channel for last 10 years were discussed. The results showed that： （1） currently, in the upper part of North Channel, the ebb tide dominated;after the construction of the typical projects, ebb TCD and TCV tended to be larger and the depth-averaged flood and ebb SSC decreased during the flood season while SSC increased during the dry season; （2） changes in the depth-averaged TCV were mainly contributed by the seasonal runoff variation during the flood season, which was larger in the flood season than that in the dry season;the controlling factors of increasing ebb TCD and TCV were those large-scale engineering projects in the North Channel; variation in SSC might mainly result from the reduction of basin annual sediment loads, large-scale nearshore projects and so on.
出处
《海洋通报》
CAS
CSCD
北大核心
2014年第4期428-435,共8页
Marine Science Bulletin
基金
国家自然科学基金中荷合作专项(51061130544)
国家自然科学专项基金(41340044)
海洋公益性行业科研专项(201005019-09)
关键词
含沙量
优势流
大型工程
长江河口
suspended sediment concentration
preferential flow
large-scale engineering projects
Yangtze Estuary
作者简介
刘高伟（1987-），男，河南周口人，硕士研究生，主要从事河口海岸水动力环境及工程应用研究。电子邮箱：liugaoweigufan@126．com。
通讯作者：程和琴（1962-），女，教授。电子邮箱：hqch@sklec．ecnu．edu．cn。
