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首页> 外文期刊>Estuarine Coastal and Shelf Science >Observations of a tidal intrusion front in a tidal channel
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Observations of a tidal intrusion front in a tidal channel

机译：潮汐通道中潮汐入侵前沿的观测

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A visible front indicated by a surface colour change, and sometimes associated with foam or debris lines, was observed in a tidal channel during neap tide. This is an example of a tidal intrusion front occurring in the absence of sudden topographical changes or reversing flows, typically reported to be associated with such fronts. Detailed Acoustic Doppler Current Profiler and conductivity/temperature/depth measurements were taken on repeated transects both with fronts apparent and with fronts absent. The results indicated that the front occurred as a result of stratification, which was sustained by the buoyancy flux and the weak tide-induced mixing during neap ebb tide. The stronger tide-induced mixing during spring tide restrained stratification, leading to the absence of a front. The mechanism of the frontogenesis was the density gradient between the stratified water formed during neap ebb tide, and the more mixed seawater during neap flood tide; thus, the water on the landward (southwestern) side of the front was stratified, and that on the seaward side (northeastern) of the front was vertically well mixed. Gradient Richardson number estimates suggest that the flow between the stratified and mixed water was near the threshold 0.25 for shear instability. Meanwhile, the density gradient would provide an initial baroclinic contribution to velocity convergence, which is indicated by the accumulation of buoyant matter such as foam, grass, and debris into a sharply defined line along the surface. The front migrates with the flood current, with a local maximum towards the eastern side of the channel, leading to an asymmetrical shape with the eastern side of the front driven further into the Tiaozhoumen tidal channel. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在潮汐潮汐期间，在潮汐通道中观察到了由表面颜色变化指示的可见前沿，有时与泡沫或碎屑线有关。这是在没有突然的地形变化或逆流的情况下发生的潮汐入侵前沿的一个例子，通常据报道与这些前沿相关。详细的声学多普勒电流剖面仪和电导率/温度/深度的测量是在重复的样条上进行的，无论是明显的前沿还是不存在的前沿。结果表明，锋面是由于分层而产生的，在浮潮期间，浮力通量和弱潮引起的混合作用维持了分层。春季潮汐期间较强的潮汐引起的混合作用抑制了分层，导致没有锋面。前缘形成的机理是潮退时形成的分层水与潮潮时混合的海水之间的密度梯度。因此，前部的陆上（西南）侧的水被分层，而前部的海侧（东北）的水垂直混合。理查森（Richardson）梯度估计值表明，分层水和混合水之间的流量接近剪切不稳定性的阈值0.25。同时，密度梯度将对速度收敛提供初始斜斜作用，这由诸如泡沫，草和碎屑之类的浮力物质沿表面成清晰界定的线的积聚来指示。锋面随洪水流动而迁移，局部最大值朝向河道东侧，导致形状不对称，锋面的东侧进一步驶入潮州门潮汐河道。 （C）2017 Elsevier Ltd.保留所有权利。

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