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首页> 外文期刊>Journal of Physical Oceanography >Turbulence from Breaking Surface Waves at a River Mouth
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Turbulence from Breaking Surface Waves at a River Mouth

机译：来自河口的破碎面波湍流

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Observations of surface waves, currents, and turbulence at the Columbia River mouth are used to investigate the source and vertical structure of turbulence in the surface boundary layer. Turbulent velocity data collected on board freely drifting Surface Wave Instrument Float with Tracking (SWIFT) buoys are corrected for platform motions to estimate turbulent kinetic energy (TKE) and TKE dissipation rates. Both of these quantities are correlated with wave steepness, which has previously been shown to determine wave breaking within the same dataset. Estimates of the turbulent length scale increase linearly with distance from the free surface, and roughness lengths estimated from velocity statistics scale with significant wave height. The vertical decay of turbulence is consistent with a balance between vertical diffusion and dissipation. Below a critical depth, a power-law scaling commonly applied in the literature works well to fit the data. Above this depth, an exponential scaling fits the data well. These results, which are in a surface-following reference frame, are reconciled with results from the literature in a fixed reference frame. A mapping between free-surface and mean-surface reference coordinates suggests 30% of the TKE is dissipated above the mean sea surface.
机译：哥伦比亚河口处的表面波，水流和湍流的观测结果被用来调查表面边界层中湍流的来源和垂直结构。针对平台运动校正了在自由漂移的具有跟踪浮标的表面波仪器浮标（SWIFT）上的湍流速度数据，以估算湍动能（TKE）和TKE耗散率。这两个量都与波陡度相关，后者先前已被证明可以确定同一数据集内的波破碎。湍流长度尺度的估计值随着与自由表面的距离而线性增加，而从速度统计数据得出的粗糙度长度则具有显着的波高。湍流的垂直衰减与垂直扩散和耗散之间的平衡一致。在临界深度以下，文献中通常采用的幂律定标可以很好地拟合数据。在此深度之上，指数缩放可以很好地拟合数据。这些结果位于表面跟随参考系中，与固定参考系中文献的结果一致。自由表面和平均表面参考坐标之间的映射表明，有30％的TKE耗散在平均海平面以上。

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