长江口徐六泾滩槽含沙量波动研究
Research on Fluctuation of Suspended Sediment Concentration in Yangtze Estuary Xuliujing Shoal and Groove
摘要: 研究长江口徐六泾1#边滩、4#深槽的含沙量在不同潮型下的波动规律及相关要素，有助于认知潮汐河口的水沙分布规律，计算推求断面含沙量及输沙率，为河口航道冲淤与河势变化的分析、河道治理与涉水工程的规划等科学研究提供理论基础。本文利用横式采样器、临底采样器等对徐六泾断面的滩槽垂线进行了现场水文测验，对测验数据进行了相关关系分析和HHT变换分析，研究表明：徐六泾滩槽含沙量波动峰值多发生在落潮时段；总体流速越大含沙量波动越剧烈，边滩含沙量波动峰值与流速峰值较为同步，深槽含沙量波动峰值则相对滞后于流速峰值；越近水底含沙量越大且波动越剧烈，边滩含沙量波动程度比深槽更为剧烈；含沙量波动与泥沙d50相关性较小；28 h、17 h、14 h波动是边滩含沙量变化的主要模式，14 h、8 h、5 h波动是深槽含沙量变化的主要模式，边滩含沙量波动规律性不强。
Abstract: Studying the fluctuation law of suspended sediment concentration in 1# marginal shoal and 4# deep groove of Xuliujing section of Yangtze Estuary under different tidal types and analyzing the related fac-tors is helpful to recognize and understand the distribution law of flow and sediment in tidal estuary. This paper calculates and calibrates the section sediment concentration and sediment transport rate, provides theoretical basis for scientific research on analysis of erosion and deposition of estuary channel and change of river regime, plan of river regulation and wading projects. Used horizontal sampler, bottom sampler and other instruments to conduct on-site hydrological tests on shoal and groove verticals of Xuliujing, conducted correlation and HHT transformation analysis on the test data. The research conclusion: Peak values of sediment concentration fluctuation in shoal and groove of Xuliujing mostly occur at falling tide; The higher the overall flow velocity is, the more violent the fluctuation is, peak values of sediment concentration fluctuation in shoal are more synchronous with peak values of flow velocity, while peak values of sediment concentration fluctuation in groove are relatively lagging behind peak values of flow velocity; The closer to the river bottom, the higher sediment concentration is and the more violent sediment concentration fluctuation is, the sediment concentration fluctuation in shoal is more violent than that of groove; Correlation between sediment concentration fluctuation and sediment d50 is small; 28 h, 17 h, 14 h and 14 h, 8 h, 5 h fluctuations are main patterns of sediment concentration changes in shoal and groove, regularity of sediment concentration fluctuation in shoal is relatively weaker.
文章引用：周昊, 刘曙光. 长江口徐六泾滩槽含沙量波动研究[J]. 水资源研究, 2023, 12(1): 16-26. https://doi.org/10.12677/JWRR.2023.121003

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