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	Tides and mixing in the northwestern East China Sea, Part II: Near-bottom turbulence
	Lozovatsky, Lossif ; Liu, Zhiyu ; Wei, Hao ; Fernando, H. J. S. ; Liu ZY(刘志宇)
	2008
关键词	tidal flows East China Sea turbulence mixing friction velocity log-layer skin-layer
英文摘要	The dissipation rate of turbulent kinetic energy e and friction velocity u* was studied in reversing and rotating tidal flows in the East China Sea near the northeastern coast of China using ADV and ADCP measurements. The highest near-bottom dissipation rate on a shallow (19m depth) shelf epsilon(nb)similar to 5 x 10(-5)W/kg was associated with the stronger flooding current of the reversing tide and the lowest epsilon(nb)similar to 10(-7) W/kg with the weaker ebb current. The log-layer (ADCP-based) and the skin-layer (ADV-based) near-bottom estimates of friction velocities, u*((log)) and u*((cor)), showed close correspondence for the reversing tidal flow, but when the tidal vector rotated over a sloping bottom u*((log)) was approximately two times larger than u*((cor)). The inapplicability of the Prandtl-Karman log-layer scaling for energetic rotating flow is considered as the major source for this discrepancy. The classical wall-layer parameterization epsilon(nb) = c(0)u*(3)/kappa zeta with c(0)=1 was found to hold well for the reversing tide, but for rotating flow c(0) = 1.5. The scaling for the dissipation rate, epsilon = c(epsilon)e(tr)/L-tr, used in the turbulent kinetic energy (e(tr)) balance equation requires c(epsilon) = 0.06 for the reversing tide, but c(epsilon) = 0.09 for the rotating flow, where the turbulent scale L-tr = kappa zeta and zeta is the distance from the seafloor. Significant departure from the wall layer parameterization was noted when advection of warm water affected the testing site at a sloping shelf (38 m depth), possibly causing convective mixing in addition to boundary-induced turbulence. (C) 2007 Elsevier Ltd. All rights reserved.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/60094]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Lozovatsky, Lossif,Liu, Zhiyu,Wei, Hao,et al. Tides and mixing in the northwestern East China Sea, Part II: Near-bottom turbulence[J],2008.
APA	Lozovatsky, Lossif,Liu, Zhiyu,Wei, Hao,Fernando, H. J. S.,&刘志宇.(2008).Tides and mixing in the northwestern East China Sea, Part II: Near-bottom turbulence..
MLA	Lozovatsky, Lossif,et al."Tides and mixing in the northwestern East China Sea, Part II: Near-bottom turbulence".(2008).

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