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首页> 外文期刊>Journal of Physical Oceanography >Broadly Distributed and Locally Enhanced Turbulent Mixing in a Tidal Estuary
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Broadly Distributed and Locally Enhanced Turbulent Mixing in a Tidal Estuary

机译：潮汐河口中分布广泛且局部增强的湍流混合

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Spatial variations of vertical turbulent mixing along a stretch of the Hudson River estuary are examined with focus on the vicinity of a "hydraulic control point" at the George Washington Bridge at which the cross section narrows and the thalweg takes a bend. Richardson numbers are lowered and mixing is enhanced downstream of this "modest" morphological feature, qualitatively following predictions based on hydraulic theory by Chant and Wilson. The enhancement in the viscous dissipation rate e is only a modest factor of 2-3, however, extending over 2 km along the river. Upon averaging over tidal and fortnightly cycles and multiple cruises, streamwise variations of e along the probed 15-km stretch of the estuary are surprisingly small, given that individual depth averages of e across the halocline vary by over three orders of magnitude. The principal result is that the observed part of the Hudson River showed strong broadly distributed mixing everywhere, with little local concentration.
机译：考察了沿哈德逊河河口一段延伸的垂直湍流混合的空间变化，重点研究了乔治华盛顿大桥的“液压控制点”附近，该处的横截面变窄，海藻弯曲。在此“适度”形态特征的下游，定性遵循了Chant和Wilson的基于水力理论的预测，从而降低了Richardson数并增强了混合。粘性耗散率e的提高只是2-3的适度因素，但是沿河延伸了2 km。在潮汐和每两周一次的周期平均和多次航行中，考虑到整个盐湖中e的各个深度平均值变化超过三个数量级，沿探测的河口15 km延伸段e的沿河方向的变化令人惊讶地小。主要结果是观察到的哈德逊河部分地区各处都有很强的广泛混合，几乎没有局部集中。

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