摘要
2007年9月在长江口北支采集表层沉积物样品,进行粒度和重矿分析,并利用Gao-Collins粒径趋势分析模型计算沉积物净输运趋势。结果显示,北支上口的沉积物有向下游输运的趋势;大新港至河口处,沉积物大致呈由北支下段向中、上段输运的趋势;北支河口外的沉积物,存在着向河口内输运的趋势。重矿物中稳定矿物与不稳定矿物比值的变化也显示,北支上口、下口处沉积物均向北支内输运,与粒径趋势分析的结果基本吻合。上述结果均显示,沉积物向北支内净输运,导致北支河段逐渐淤积。
The surface sediment samples were collected in the North Branch to obtain the grain size and heavy mineral data sets in September,2007.The grain size trend analysis model developed by Gao and Collins（1992） has been applied to obtain the sediment transport pathway in the study area.The results show that the sediments transport towards the down stream from the upper entrance and towards the upper stream from the mouth.In addition,the sediments also transport into the North Branch from the adjoining sea area.The variations of the ration of stable and unstable heavy mineral contents show that sediments converge within the North Branch,which has been supported by the sediment dynamics measurements and geomorphology changes.The net deposit in the North Branch has resulted in the significant siltation.
出处
《海洋通报》
CAS
CSCD
北大核心
2010年第3期264-270,共7页
Marine Science Bulletin
基金
江苏省自然科学基金(BK2006131)
江苏省"六大人才高峰"项目(2006027)
关键词
粒度参数
重矿物
粒径趋势分析
北支
grain size parameters
heavy mineral
grain size trend analysis
North Branch
