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Numerical studies on the degeneration of internal waves induced by an initial tilted pycnocline

ISSN号：0253-505X
期刊名称：Acta Oceanologica Sinica
时间：2014.7
页码：27-39
分类：P435[天文地球—大气科学及气象学] P731.24[天文地球—海洋科学]
作者机构：[1]Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China, [2]Key Laboratory of Ocean Circulation and Waves (KLOCAW), Chinese Academy of Sciences, Qingdao 266071, China
相关基金：Foundation item： The Fund for Creative Research Groups by the National Natural Science Foundation of China under contract No. 41121064; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11010104; the Open Fund of State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences under contract No. LTO 1104; The numerical computation is supported by High Perfor- mance Computing Center, Institute of Oceanology, Chinese Academy of Sciences.
相关项目：我国典型海域生态系统演变过程与机制

关键词：数值研究, 密度跃层, 内波, 变性, 诱导, 闭合模型, 内弧立波, 非线性项, internal wave, numerical model, wave breaking, energy dissipation

中文摘要：

在一个关上的领域的 pycnocline 被强迫的外部风倾斜并且当风下时，趋于恢复到一个水平位置。如果强迫是弱的，否则内部巨浪和内部独居的波浪出现，内部湖震摆动展出，它用作一个连接串联精力到小规模的过程。与一个骚乱闭合模型一起的二维的非静水力学的代码被构造扩大以前的实验室研究。模型能复制在相应实验室实验观察的所有关键现象。模型结果进一步为相关动态进程的深入的理解用作一个全面、可靠的数据集合。比较分析显示那个非线性的术语赞成内部巨浪和随后的内部独居的波浪的产生，并且线性模型相当预言一般趋势很好。垂直边界能近似反映所有到来的波浪，当斜坡边界为小规模的内部波浪碎和精力驱散用作一个区域时。领域的时间的进化综合运动并且势能也被分析，并且结果显示大约 20% 起始的可得到的势能在碎的第一个内部波浪期间被失去过程。象格子拓扑学和模型初始化那样的某数字战术简短也被讨论。

英文摘要：

The pycnocline in a closed domain is tilted by external wind forcing and tends to restore to a level posi- tion when the wind falls. An internal seiche oscillation exhibits if the forcing is weak, otherwise internal surge and internal solitary waves emerge, which serve as a link to cascade energy to small-scale processes. A two-dimensional non-hydrostatic code with a turbulence closure model is constructed to extend previous laboratory studies. The model could reproduce all the key phenomena observed in the corresponding labo- ratory experiments. The model results further serve as a comprehensive and reliable data set for an in-depth understanding of the related dynamical process. The comparative analyses indicate that nonlinear term favors the generation of internal surge and subsequent internal solitary waves, and the linear model predicts the general trend reasonably well. The vertical boundary can approximately reflect all the incoming waves, while the slope boundary serves as an area for small-scale internal wave breaking and energy dissipation. The temporal evolutions of domain integrated kinetic and potential energy are also analyzed, and the results indicate that about 20% of the initial available potential energy is lost during the first internal wave breaking process. Some numerical tactics such as grid topology and model initialization are also briefly discussed.