Internal Wave Generation by Tidal Flow over a Continental Shelf Slope
Internal Wave Generation by Tidal Flow over a Continental Shelf Slope
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DOI：
10.1023/b:joce.0000038356.45342.6c
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发表时间：
2004-06
影响因子：
2.3
通讯作者：
T. Hibiya
中科院分区：
文献类型：
--
作者：
T. Hibiya
使用多级数值模型再现了大陆架斜坡上强潮汐流产生内波的过程。根据数值结果，论证了潮汐平流效应在内波产生过程中的关键作用。还检查了所产生的内部波形与潮汐平流效应强度之间的密切关系。内波上的正压强迫实际上在大陆架斜坡顶部相对较小的水平尺度内起作用。当架断处的最大内弗劳德数（Frm）小于约0.6时，所产生的内波的幅度几乎与Frm成正比。然而，当 Frmis 大于约 0.6 时，所得内波的振幅变得大于线性理论预测的振幅。特别是当Frmis大于1时，向岸传播的内波在正压强迫区停留的时间变得更长。因此，内波显着放大，水平尺度接近正压强迫，集中在大陆架斜坡顶部相对较小的区域。
The generation process of internal waves by strong tidal flow over a continental shelf slope is reproduced using a multi-level numerical model. On the basis of the numerical results, the crucial role of the tidal advection effect in the generation process of internal waves is demonstrated. The close relation between the resulting internal waveform and the strength of the tidal advection effect is also examined. The barotropic forcing on the internal wave actually works within a relatively small horizontal scale over the top of the continental shelf slope. When the maximum internal Froude number at the shelf break (Frm) is less than about 0.6, the amplitude of the resulting internal wave is almost proportional to Frm. When Frmis more than about 0.6, however, the amplitude of the resulting internal wave becomes larger than predicted by linear theory. In particular, when Frmis more than unity, the time period during which the shoreward propagating internal wave stays in the barotropic forcing region becomes much longer. Consequently, the internal wave is significantly amplified with the horizontal scale approaching that of the barotropic forcing, which concentrates in a relatively small region over the top of the continental shelf slope.