夏季浙江沿岸陆架区泥沙输运机制

发布时间：2018-06-20 19:33

本文选题：泥沙输运 + 潮流　；参考：《海洋学报》2017年03期

【摘要】：基于2014年夏季浙江沿岸陆架区的水文、泥沙、底质沉积物等实测资料,运用物质通量分析方法和Gao-Collins粒径趋势分析法,探讨了泥沙的输运通量、输运方向、动力机制及净输运趋势。夏季,近岸含沙量规律性较强,由西至东逐渐降低,由南至北逐渐升高,且与潮流有非常好的对应关系,呈现出明显的潮周期变化特征。研究区净悬沙通量自岸向外海迅速变小,悬沙输运中平流输运占主导地位,其次是垂向净环流对悬沙输运的影响,近岸海域表现为向海输沙,30m以深海域表现为东北向输沙,同时台湾暖流的屏障作用也影响了悬沙向海扩散。粒径趋势分析显示浙江沿岸陆架表层沉积物的长期输运机制为由东北向西南输运,在流系以及海底地形的影响下,中部海域出现粒径趋势较弱的沉积中心。而在夏季,悬浮泥沙主要为平行岸线向东北输运,估算每天进入研究海域的净悬浮泥沙约为1.9×106 t。
[Abstract]:Based on the measured data of hydrology, sediment and sediment in the coastal continental shelf of Zhejiang Province in the summer of 2014, the transport flux and transport direction of sediment are discussed by using the method of mass flux analysis and Gao-Collins particle size trend analysis. Dynamic mechanism and net transport trend. In summer, there is a strong regularity of sediment concentration in the nearshore, which decreases gradually from west to east and rises from south to north, and has a very good correspondence with tidal current, showing obvious characteristics of tidal cycle variation. In the study area, the net suspended sediment flux decreases rapidly from shore to the outer sea, and advection transport dominates in suspended sediment transport, followed by the influence of vertical net circulation on suspended sediment transport. At the same time, the barrier effect of Taiwan warm current also affected the diffusion of suspended sand to the sea. The grain size trend analysis shows that the long-term transport mechanism of surface sediments along Zhejiang coast shelf is from northeast to southwest. Under the influence of current system and submarine topography, there are sedimentary centers with weaker grain size trend in the central sea area. In summer, the suspended sediment is mainly transported to the northeast along the parallel shoreline, and it is estimated that the net suspended sediment entering the study area is about 1.9 脳 10 ~ 6 t per day.
【作者单位】：青岛海洋地质研究所国土资源部油气资源和环境地质重点实验室;青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室;
【基金】：国家自然科学基金重点项目(41330964) 地调项目(GZH201200506)
【分类号】：TV142

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