气候变化领域集成服务门户(CCPortal): Numerical Investigation of Baroclinic Channel-Shoal Interaction in Partially Stratified Estuaries

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DOI	10.1029/2020JC016135
	Numerical Investigation of Baroclinic Channel-Shoal Interaction in Partially Stratified Estuaries
	Zhou J.; Stacey M.T.; Holleman R.C.; Nuss E.; Senn D.B.
发表日期	2020
ISSN	21699275
卷号	125 期号:4
英文摘要	The internal, density-driven channel-shoal interaction in partially stratified estuaries is numerically investigated. Idealized General Estuarine Transport Model (GETM) simulations with the rigid-lid assumption are performed in a two-dimensional cross-sectional mode forced by a constant longitudinal salinity gradient and an M2 tidal current. Simulation results show that within each tide cycle, the abrupt flattening of bathymetry at the channel-shoal interface leads to the trapping of a patch of high-salinity water mass on the shoal. The resulting local salinity maximum near the interface interacts with the differential advection by the gentle slope of shoal, driving complex density-driven on-shoal lateral circulations. Next, it is found that the presence of the shoal in turn enhances the longitudinal residual circulation in the channel. As a storage of estuarine water that is partially isolated from the main stream, the shoal traps saltier water that originates from the channel during slack after ebb (thus a less stratified flood), while injects fresher water into the surface of the channel during slack after flood (thus a more stratified ebb). These lateral baroclinic exchanges across the channel-shoal interface give rise to a new mechanism for generating tidal asymmetry of eddy viscosity and shear in the channel (i.e., tidal straining circulation), which has the same orientation with the classical estuarine circulation. The interfacial salt trapping and the accompanied shoal-induced modification of channel residual circulation are demonstrated to possess a highly localized nature, with their characteristics largely independent of shoal bathymetry far away from the channel-shoal interface. ©2020. American Geophysical Union. All Rights Reserved.
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/186915
作者单位	Department of Civil and Environmental Engineering, University of California, Berkeley, CA, United States; Center for Watershed Sciences, University of California, Davis, CA, United States; San Francisco Estuary Institute, Richmond, CA, United States
推荐引用方式 GB/T 7714	Zhou J.,Stacey M.T.,Holleman R.C.,et al. Numerical Investigation of Baroclinic Channel-Shoal Interaction in Partially Stratified Estuaries[J],2020,125(4).
APA	Zhou J.,Stacey M.T.,Holleman R.C.,Nuss E.,&Senn D.B..(2020).Numerical Investigation of Baroclinic Channel-Shoal Interaction in Partially Stratified Estuaries.Journal of Geophysical Research: Oceans,125(4).
MLA	Zhou J.,et al."Numerical Investigation of Baroclinic Channel-Shoal Interaction in Partially Stratified Estuaries".Journal of Geophysical Research: Oceans 125.4(2020).