气候变化领域集成服务门户(CCPortal): Study of Sediment Transport in a Tidal Channel-Shoal System: Lateral Effects and Slack-Water Dynamics

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DOI	10.1029/2020JC016334
	Study of Sediment Transport in a Tidal Channel-Shoal System: Lateral Effects and Slack-Water Dynamics
	Zhou Z.; Ge J.; van Maren D.S.; Wang Z.B.; Kuai Y.; Ding P.
发表日期	2021
ISSN	21699275
卷号	126 期号:3
英文摘要	Lateral flows redistribute sediment and influence the morphodynamics of channel-shoal systems. However, our understanding of lateral transport of suspended sediment during high and low water slack is still fairly limited, especially in engineered estuaries. Human interventions such as dike-groyne structures influence lateral exchange mechanisms. The present study aims to unravel these mechanisms in a heavily engineered, turbid channel-shoal system in the Changjiang Estuary, using a high-resolution unstructured-grid three-dimensional model and in situ observations. Analysis of model results reveals two typical transport patterns during slack-water conditions, that is, shoal-to-channel transport during low water slack and channel-to-shoal transport during high water slack. A momentum balance analysis is carried out to explain mechanisms driving the lateral transport of suspended sediment during high water slack, revealing the importance of lateral pressure gradients, Coriolis force, and the curvature-induced term. Groyne fields play a crucial role in sediment transport, especially during low water slack. A model scenario in which one groyne is removed reveals that groyne fields strongly influence lateral sediment transport. The decomposition of the sediment transport flux reveals that the turbidity maximum is shaped by a balance between seaward advection by residual flows, and landward transport by tidal pumping and gravitational circulation. Within the turbidity maximum, sediment is laterally redistributed by lateral flows during slack-water conditions, greatly influencing estuarine channel morphology. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	groyne fields; lateral flow; numerical model; salinity gradient; sediment transport; slack-water dynamics
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/186428
作者单位	State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China; Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Netherlands; Institute of Eco-Chongming (IEC), ChenJiazhen, Shanghai, China; Department of Marine and Coastal Systems, Deltares, Delft, Netherlands
推荐引用方式 GB/T 7714	Zhou Z.,Ge J.,van Maren D.S.,et al. Study of Sediment Transport in a Tidal Channel-Shoal System: Lateral Effects and Slack-Water Dynamics[J],2021,126(3).
APA	Zhou Z.,Ge J.,van Maren D.S.,Wang Z.B.,Kuai Y.,&Ding P..(2021).Study of Sediment Transport in a Tidal Channel-Shoal System: Lateral Effects and Slack-Water Dynamics.Journal of Geophysical Research: Oceans,126(3).
MLA	Zhou Z.,et al."Study of Sediment Transport in a Tidal Channel-Shoal System: Lateral Effects and Slack-Water Dynamics".Journal of Geophysical Research: Oceans 126.3(2021).