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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Bumpy Topographic Effects on the Transbasin Evolution of Large-Amplitude Internal Solitary Wave in the Northern South China Sea
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Bumpy Topographic Effects on the Transbasin Evolution of Large-Amplitude Internal Solitary Wave in the Northern South China Sea

机译：南海北部大幅度内部孤立浪潮转置型展开的颠簸地形效应

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摘要

The bumpy continental slope/shelf topography is a quite common feature in the northern South China Sea (SCS), yet its effect on the shoaling internal solitary waves (ISWs) remains poorly understood. Therefore, numerical simulations by a fully nonlinear, nonhydrostatic model are carried out to explore the bumpy continental slope/shelf topographic effects on the transbasin evolution of large-amplitude ISW in the northern SCS. It is found that the prominent bumps over both continental slope and shelf regions play significant roles in modulating the evolution of transbasin ISW in the northern SCS. The bump over the continental slope is capable of triggering a solitary-like mode-2 internal wave packet, while the bump over the continental shelf can result in three wave groups, including a leading group of rank-ordered mode-1 ISW packet and two following groups of non-rank-ordered mode-1 ISW packet and mode-2 internal waves. The bumps can cause a peak-to-peak difference of the energy decay rate of ISW up to 10-20 kW/m over continental slope region and 3-5 kW/m over continental shelf region. The wave kinetic energy (KE) is found to exceed the available potential energy (APE) by as much as 50% over the continental shelf break region. Over the shelf region, however, the bumps can first make the KE drop to as low as only 80% of the APE, but later the KE might bounce back to approximately 1.1-1.2 times of the APE. Both onshore- and offshore-propagating beam-like disturbances are found to be excited by the bumps. Except for the onshore-propagating mode-2 ISW packet, the reflected offshore-propagating waves in different internal modes are also formed. These onshore- and offshore-propagating multimodal internal waves can be clarified by the beam scattering and local generation mechanism.
机译：崎岖的大陆坡/架子形貌是南海北海（SCS）的一个相当普遍的特色，但它对浅层内部孤独波（ISWS）的影响仍然很差。因此，通过全非线性，非水ratic模型进行数值模拟，以探索崎岖的大陆斜坡/架子地形效应对北部SCS的大幅度isw的转置蛋白演化。结果发现，在欧陆坡和货架区域的突出凸起起着显着的作用，在调制北部SCS中的转塔宾蛋白isw的演变时起着重要作用。大陆斜坡上的凸起能够触发像样的模式-2内部波包，而大陆架上的凹凸可以导致三个波组，包括领先的秩序排序模式-1 isw包和两个以下逐组非级排序模式-1 ISW数据包和模式-2内部波。凸块可能导致电力衰减率的峰值到峰值差异，在大陆坡度区域上高达10-20 kW / m，3-5 kW / m在大陆架区域。发现波动能（KE）在大陆架断裂区域超过50％的可用势能（APE）超过50％。然而，在搁板区域上，凸块可以首先使ke下降至仅为80％的猿，但后来ke可能会反弹到猿的大约1.1-1.2倍。发现在陆上和海上传播的光束状扰动都被凸块激发。除了载体传播模式-2ISW分组之外，还形成了不同内部模式的反射近海传播波。可以通过光束散射和局部产生机制来阐明这些陆上和海上传播的多模式内部波。

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