气候变化领域集成服务门户(CCPortal): Effects of Sediment-Induced Density Gradients on the Estuarine Turbidity Maximum in the Yangtze Estuary

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DOI	10.1029/2020JC016927
	Effects of Sediment-Induced Density Gradients on the Estuarine Turbidity Maximum in the Yangtze Estuary
	Zhu C.; van Maren D.S.; Guo L.; Lin J.; He Q.; Wang Z.B.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	An estuarine turbidity maximum (ETM) is a region of elevated suspended sediment concentration (SSC) resulting from residual transport mechanisms driven by river flow, tides, and salinity-induced density gradients (SalDG). However, in energetic and highly turbid environments such as the Yangtze Estuary, SedDG may also substantially contribute to the formation and maintenance of the ETM. Since this mechanism is relatively poorly understood, we develop a three-dimensional model to explore the effect of SedDG on tidal dynamics and sediment transport. By running sensitivity simulations considering SalDG and/or SedDG, we conclude that the longitudinal SedDG leads to degeneration and landward movement of the ETM. Moreover, two effects of the vertical SedDG are identified to be responsible for sediment trapping: One by enhancing the vertical sediment concentration gradients, and another by additionally affecting hydrodynamics including the water levels, velocities and salinities. The longitudinal and vertical SedDG leads to seasonal and spring-neap variations of upstream migration of the salt wedge: Vertical SedDG is more pronounced at neap tides in the wet season due to stronger stratification effects, whereas longitudinal SedDG is more pronounced at intermediate tides in the dry season due to weaker mixing and limited deposition. These findings imply that the SedDG contributes substantially to channel siltation and salt intrusion in highly turbid systems, and need to be accounted for when numerically modeling such phenomena. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	salt intrusion; sediment trapping; sediment-induced density gradient; turbidity maximum
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186311
作者单位	State Key Lab of Estuarine and Coastal Research, East China Normal University, Shanghai, China; Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Netherlands; Deltares, Delft, Netherlands
推荐引用方式 GB/T 7714	Zhu C.,van Maren D.S.,Guo L.,et al. Effects of Sediment-Induced Density Gradients on the Estuarine Turbidity Maximum in the Yangtze Estuary[J],2021,126(5).
APA	Zhu C.,van Maren D.S.,Guo L.,Lin J.,He Q.,&Wang Z.B..(2021).Effects of Sediment-Induced Density Gradients on the Estuarine Turbidity Maximum in the Yangtze Estuary.Journal of Geophysical Research: Oceans,126(5).
MLA	Zhu C.,et al."Effects of Sediment-Induced Density Gradients on the Estuarine Turbidity Maximum in the Yangtze Estuary".Journal of Geophysical Research: Oceans 126.5(2021).