气候变化领域集成服务门户(CCPortal): Modeling Mud and Sand Transfers Between a Macrotidal Estuary and the Continental Shelf: Influence of the Sediment Transport Parameterization

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DOI	10.1029/2019JC015643
	Modeling Mud and Sand Transfers Between a Macrotidal Estuary and the Continental Shelf: Influence of the Sediment Transport Parameterization
	Diaz M.; Grasso F.; Le Hir P.; Sottolichio A.; Caillaud M.; Thouvenin B.
发表日期	2020
ISSN	21699275
卷号	125 期号:4
英文摘要	Coastal environments are directly influenced by terrigenous inputs coming from rivers through estuaries. Quantifying the amount of nutrients and contaminants transported by sediments from continental areas to the sea is crucial for marine resources protection. However, the complexity of estuarine dynamics makes it difficult to quantify sediment fluxes from field measurements alone and requires numerical modeling. Thus, using a realistic 3-D hydrodynamic and sediment transport model, this study aims at evaluating the influence of model empirical parameters on sediment fluxes and estimating uncertainties on mud and sand transfers at a macrotidal estuary mouth. A sensitivity analysis, considering changes in sediment transport parameters, revealed that the system is sensitive not only to settling and erosion parameterizations but also to the spin-up period and the sediment sliding process. Both estuarine circulation and tidal pumping induce a residual up-estuary transport, which is balanced by seaward export during spring tides. Although more fine sediments are exported within the surface turbid plume during high river discharge, the net mud transport is directed up-estuary due to increased baroclinic circulation. Besides, model results highlighted a strong seasonal variability in sediment fluxes with a short and high import during high river flow and a long and weak export during low river flow. Uncertainties associated with the simulated fluxes were about 93% for mud and 51% for noncohesive classes, based on the best performing parameter sets for surface suspended sediment concentrations. These results can be reliably extrapolated to similar macrotidal estuarine systems. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Gironde Estuary; mud/sand; numerical modeling; sediment fluxes; sensitivity analysis
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/186932
作者单位	IFREMER - DYNECO/DHYSED, Plouzané, France; University of Bordeaux, EPOC, Pessac, France
推荐引用方式 GB/T 7714	Diaz M.,Grasso F.,Le Hir P.,et al. Modeling Mud and Sand Transfers Between a Macrotidal Estuary and the Continental Shelf: Influence of the Sediment Transport Parameterization[J],2020,125(4).
APA	Diaz M.,Grasso F.,Le Hir P.,Sottolichio A.,Caillaud M.,&Thouvenin B..(2020).Modeling Mud and Sand Transfers Between a Macrotidal Estuary and the Continental Shelf: Influence of the Sediment Transport Parameterization.Journal of Geophysical Research: Oceans,125(4).
MLA	Diaz M.,et al."Modeling Mud and Sand Transfers Between a Macrotidal Estuary and the Continental Shelf: Influence of the Sediment Transport Parameterization".Journal of Geophysical Research: Oceans 125.4(2020).