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Apparatus and methods

机译:设备和方法

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摘要

Kelvin-Helmholtz (KH) instability plays an important role in turbulent mixing in deep oceans, coastal seas, and estuaries. Though widely observed and studied in thermohaline-stratified waters, KH instability has only rarely been observed in sediment-stratified environments. For the first time, we present direct observations of KH billows on an estuarine lutocline by combining echosounder images with velocity and density measurements. The interaction between velocity shear and the density stratification induced by suspended sediments initiated shear instabilities near the bed, indicated by gradient Richardson number (Ri) < 0.25 in the early stages of the observed billows. Once formed, the instabilities enhanced the vertical mixing of momentum, reducing vertical shear and elevating Ri. Linear instability analysis using measured velocity and density profiles well predicts the vertical location and spatial characteristics of the observed billows. These instabilities are believed to contribute to the vertical mixing, entrainment, and transport of estuarine and coastal sediments.
机译:Kelvin-Helmholtz(kH)不稳定在深海,沿海和河口的湍流混合中起着重要作用。虽然在热卤素分层的水中广泛观察和研究,但在沉积物分层环境中仅观察到KH不稳定性。首次,我们通过将回声鸟图像与速度和密度测量相结合来展示KH BULLOWS对雌曲线LUTOCLIN的直接观察。速度剪切与悬浮沉积物诱导的密度分层之间的相互作用引发了床附近的剪切稳定性,由观察到的波涛的早期阶段中的梯度理查森数(RI)<0.25表示。一旦形成,不稳定性增强了动量的垂直混合,减少了垂直剪切和升降Ri。使用测量速度和密度分布的线性不稳定性分析很好地预测了观察到的波涛的垂直位置和空间特征。这些不稳定性被认为有助于雌曲线和沿海沉积物的垂直混合,夹带和运输。

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  • 来源
    《Oceanographic Literature Review》 |2020年第6期|1199-1199|共1页
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