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首页> 外文期刊>Journal of Physical Oceanography >Amplification and Suppression of Internal Waves by Tides over Variable Bottom Topography
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Amplification and Suppression of Internal Waves by Tides over Variable Bottom Topography

机译：可变底部地形上的潮汐对内波的放大和抑制

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The energy exchange between internal waves and barotropic currents over inclined bottom topography is studied theoretically and in the framework of the numerical model. The energy balance equation derived for a continuously stratified fluid predicts that energy can either be transferred toward or away from the internal wave depending on the direction of propagation of both the wave and current. Four scenarios of wave-flow interaction over the inclined bottom were identified. An internal wave extracts energy from the background tidal flow during its propagation upslope-upstream or downslope-downstream and its amplitude grows. The wave loses energy propagating downslope—upstream or upslope-downstream and reduces in amplitude. This mechanism of suppression or amplification of internal waves by a current over an inclined bottom is verified numerically. When applied to the area of the Knight Inlet sill, a high-resolution fully nonlinear, nonhydrostatic model reproduces the packets of internal waves generated by supercritical tidal flow over the sill. Careful inspection of the wave fields revealed the presence of an irregular wave structure within wave packets—namely, internal waves are not arranged by amplitude. This phenomenon, obtained numerically and observed in situ, is treated in terms of the mechanism of wave-flow interaction: the energy exchange between the tidal current and generated internal waves over the inclined bottom topography is the reason for the absence of traditional rank-ordered waves in the packet.
机译：从理论上并在数值模型的框架内研究了倾斜底部地形上内波与正压流之间的能量交换。为连续分层的流体导出的能量平衡方程式预测，取决于波和电流的传播方向，能量可以朝向内波传递或远离内波传递。确定了倾斜底部上波流相互作用的四种情况。内部波在其向上，向上游或向下，向下游传播期间，从背景潮流中提取能量，并且其幅度增大。该波会失去传播到下坡（上游或上坡-下游）的能量，并降低振幅。通过数字验证了这种通过倾斜底部上方的电流抑制或放大内部波的机制。当应用到Knight Inlet窗台区域时，高分辨率的完全非线性，非静水模型会重现窗台上超临界潮汐流产生的内部波包。仔细检查波场可以发现波包中存在不规则的波结构，即内部波没有按振幅排列。通过波流相互作用的机理来处理这种通过数字获得并现场观察到的现象：潮汐流与倾斜底部地形上产生的内波之间的能量交换是缺乏传统等级排序的原因包中有波浪。

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