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首页> 外文期刊>Journal of Physical Oceanography >Internal Wave Breaking at Concave and Convex Continental Slopes
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Internal Wave Breaking at Concave and Convex Continental Slopes

机译：凹面和凸面大陆坡的内部波浪破碎

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摘要

Internal wave reflection from a sloping topographic boundary may lead to enhanced shear if the topographic angle to the horizontal is close to that of the internal wave group velocity vector. Previous analytic studies have suggested that shear enhancement is reduced at concave slopes as compared with convex and planar slopes near the critical angle. Here the internal wave reflection from concave and convex slopes that pass through the critical angle is investigated numerically using the nonhydrostatic Massachusetts Institute of Technology General Circulation Model (MITgcm). Overturning, shear instability, and resultant mixing are examined. Results are compared with simulations of wave reflection from planar slopes with angles greater than, less than, and equal to the critical angle. In contrast to the analytic predictions, no reduction in mixing is found for the concave slope as compared with the other slopes. In all cases, stratification is eroded in a band above the slope, bounded at its outer edge by the internal wave characteristic. The difference between numerical and analytic results is caused by the nonlinearity of the numerical calculations, where the finite-amplitude flow leads to generation of upslope-propagating bores for a wide range of topographic slopes around the critical angle.
机译：如果相对于水平面的地形角度接近内部波群速度矢量的角度，则来自倾斜地形边界的内部波反射可能会导致剪切增强。先前的分析研究表明，与临界角附近的凸面和平面斜坡相比，凹面斜坡的剪切增强作用有所降低。在这里，使用非静力学的麻省理工学院通用循环模型（MITgcm）对通过临界角的凹凸面的内波反射进行了数值研究。检查倾覆，剪切不稳定性和所得混合。将结果与来自角度大于，小于和等于临界角的平面斜坡的波反射模拟进行比较。与分析预测相反，与其他斜坡相比，没有发现凹面斜坡的混合减少。在所有情况下，分层都在斜坡上方的一条带中受到侵蚀，并在其外边缘受到内部波动特征的限制。数值计算和分析结果之间的差异是由数值计算的非线性引起的，其中，有限幅度的流动导致临界角周围宽范围的地形坡度都产生了向上传播的孔。

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