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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Turbulence spectra and local similarity scaling in a strongly stratified oceanic bottom boundary layer
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Turbulence spectra and local similarity scaling in a strongly stratified oceanic bottom boundary layer

机译：强分层海洋底部边界层中的湍流谱和局部相似度

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摘要

In the turbulence inertial subrange, wavenumber spectra of vertical velocity and streamwise velocity in a strongly stratified oceanic bottom boundary layer agree with the local similarity scaling laws found previously in the stable atmospheric boundary layer. At scales greater than the turbulence inertial subrange, oceanic velocity spectra exceed the universal spectra. This additional energy at large scales could be due either to internal waves, inappropriate estimates of turbulence parameters, or non-stationarity of the data. Providing that the energy containing eddies in the stratified boundary layer have a scale close to the Ozmidov scale, epsilon(1/2)N(-3/2), where epsilon is the turbulence kinetic energy dissipation rate and N is the buoyancy frequency, the universal model spectrum leads to a turbulent scaling epsilon = betaNsigma(w)(2), where beta is a dimensionless constain 0.6-1.5 and sigma(w)(2) is the vertical velocity variance. This scaling law of epsilon has been found in free shear flows in the ocean and atmosphere. The turbulence Reynolds stress is related to the vertical velocity variance as - - 1/4sigma(w)(2). The strong stratification in the observed tidal bottom boundary layer is maintained by the advective density gradient. Results reported here include the effects of horizontal advection. (C) 2003 Elsevier Ltd. All rights reserved. [References: 34]
机译：在湍流惯性子范围内，强分层海洋底部边界层中的垂直速度和水流速度的波数谱与先前在稳定大气边界层中发现的局部相似性定律一致。在大于湍流惯性子范围的尺度上，海洋速度谱超过了通用谱。大规模的这种额外能量可能是由于内部波浪，湍流参数的不适当估计或数据的不稳定。假设分层边界层中包含能量的涡流的尺度接近Ozmidov尺度epsilon（1/2）N（-3/2），其中epsilon是湍流动能耗散率，N是浮力频率，通用模型谱导致湍流缩放ε= betaNsigma（w）（2），其中beta是无量纲，包含0.6-1.5，而sigma（w）（2）是垂直速度方差。在海洋和大气中的自由剪切流中发现了这种ε定标律。雷诺湍流的应力与垂直速度方差有关--1 / 4sigma（w）（2）。对流密度梯度保持了所观察到的潮汐底部边界层的强烈分层。此处报告的结果包括水平对流的影响。 （C）2003 Elsevier Ltd.保留所有权利。 [参考：34]

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