气候变化领域集成服务门户(CCPortal): Acoustic Observations of Kelvin-Helmholtz Billows on an Estuarine Lutocline

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DOI	10.1029/2019JC015383
	Acoustic Observations of Kelvin-Helmholtz Billows on an Estuarine Lutocline
	Tu J.; Fan D.; Lian Q.; Liu Z.; Liu W.; Kaminski A.; Smyth W.
发表日期	2020
ISSN	21699275
卷号	125 期号:4
英文摘要	Kelvin-Helmholtz (KH) instability plays an important role in turbulent mixing in deep oceans, coastal seas, and estuaries. Though widely observed and studied in thermohaline-stratified waters, KH instability has only rarely been observed in sediment-stratified environments. For the first time, we present direct observations of KH billows on an estuarine lutocline by combining echosounder images with velocity and density measurements. The interaction between velocity shear and the density stratification induced by suspended sediments initiated shear instabilities near the bed, indicated by gradient Richardson number (Ri) < 0.25 in the early stages of the observed billows. Once formed, the instabilities enhanced the vertical mixing of momentum, reducing vertical shear and elevating Ri. Linear instability analysis using measured velocity and density profiles well predicts the vertical location and spatial characteristics of the observed billows. These instabilities are believed to contribute to the vertical mixing, entrainment, and transport of estuarine and coastal sediments. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	estuary; Kelvin-Helmholtz instability; lutocline; mixing; sediment transport
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/186910
作者单位	State Key Laboratory of Marine Geology, Tongji University, Shanghai, China; Laboratory of Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; State Key Laboratory of Marine Environmental Science, and Department of Physical Oceanography, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China; Applied Physics Laboratory, University of Washington, Seattle, WA, United States; College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States
推荐引用方式 GB/T 7714	Tu J.,Fan D.,Lian Q.,et al. Acoustic Observations of Kelvin-Helmholtz Billows on an Estuarine Lutocline[J],2020,125(4).
APA	Tu J..,Fan D..,Lian Q..,Liu Z..,Liu W..,...&Smyth W..(2020).Acoustic Observations of Kelvin-Helmholtz Billows on an Estuarine Lutocline.Journal of Geophysical Research: Oceans,125(4).
MLA	Tu J.,et al."Acoustic Observations of Kelvin-Helmholtz Billows on an Estuarine Lutocline".Journal of Geophysical Research: Oceans 125.4(2020).