气候变化领域集成服务门户(CCPortal): Sediment-Induced Stratification in an Estuarine Bottom Boundary Layer

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DOI	10.1029/2019JC016022
	Sediment-Induced Stratification in an Estuarine Bottom Boundary Layer
	Egan G.; Manning A.J.; Chang G.; Fringer O.; Monismith S.
发表日期	2020
ISSN	21699275
卷号	125 期号:8
英文摘要	We took field observations on the shallow shoals of South San Francisco Bay to examine how sediment-induced stratification affects the mean flow and mixing of momentum and sediment throughout the water column. A Vectrino Profiler measured near-bed velocity and suspended sediment concentration profiles, which we used to calculate profiles of turbulent sediment and momentum fluxes. Additional turbulence statistics were calculated using data from acoustic Doppler velocimeters placed throughout the water column. Results showed that sediment-induced stratification, which was set up by strong near-bed wave shear, can reduce the frictional bottom drag felt by the mean flow. Measured turbulence statistics suggest that this drag reduction is caused by stratification suppressing near-bed turbulent fluxes and reducing turbulent kinetic energy dissipation. Turbulent sediment fluxes, however, were not shown to be limited by sediment-induced stratification. Finally, we compared our results to a common model parameterization which characterizes stratification through a stability parameter modification to the turbulent eddy viscosity and suggest a new nondimensional parameter that may be better suited to represent stratification when modeling oscillatory boundary layer flows. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	boundary layer dynamics; drag reduction; sediment transport; sediment-induced stratification
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/186714
作者单位	Department of Civil and Environmental Engineering, Stanford University, Stanford, CA, United States; HR Wallingford, Wallingford, United Kingdom; School of Biological and Marine Sciences, University of Plymouth, Drake Circus, Plymouth, United Kingdom; Integral Consulting Inc., Santa Cruz, CA, United States
推荐引用方式 GB/T 7714	Egan G.,Manning A.J.,Chang G.,et al. Sediment-Induced Stratification in an Estuarine Bottom Boundary Layer[J],2020,125(8).
APA	Egan G.,Manning A.J.,Chang G.,Fringer O.,&Monismith S..(2020).Sediment-Induced Stratification in an Estuarine Bottom Boundary Layer.Journal of Geophysical Research: Oceans,125(8).
MLA	Egan G.,et al."Sediment-Induced Stratification in an Estuarine Bottom Boundary Layer".Journal of Geophysical Research: Oceans 125.8(2020).