不对称地形产生的内波

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL
K. Hakes, J. Crockett
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引用次数: 0

摘要

以往有关潮汐在海洋地形上产生内波的实验和理论研究通常使用对称地形剖面。然而,由于真实海洋地形的复杂性,不对称的影响不容忽视。研究表明,地形的复杂性(包括不对称)会对内波的产生产生重大影响,但尚未对地形的不对称进行系统探讨。这项研究比较了九种不同的二维不对称地形产生的潮汐内波,这些地形由一侧较陡的高斯曲线和另一侧较宽的高斯曲线组成。较宽曲线的振幅从较陡曲线的 60% 到等值不等。测试了两种振荡频率。在物理空间和傅里叶空间对地形两侧潮汐产生的内波中的动能密度进行了定性和定量比较。与类似的对称地形相比,非对称地形产生的波在动能密度的大小和波数分布上都有明显的不同。地形相对陡峭一侧的波包含的动能比较宽一侧多达 50%。然而,与陡峭地形相关的高波数处动能却很少。相反,内部波场以低波数为主,50%-90% 的动能密度包含在与地形较宽一侧相对应的波长中。减小较宽曲线的振幅不会对动能密度谱产生明显影响。因此,这里量化的差异完全是由于斜率的变化造成的,并显示了相对轻微的不对称对内波产生的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Internal waves generated from asymmetric topographies

Previous experimental and theoretical research on tidally generated internal waves over oceanic topography has often used symmetric topographic profiles. However, due to the complex nature of real ocean topography, the effect of asymmetry cannot be overlooked. Studies have shown that topographic complexities, including asymmetry, can have a significant impact on internal wave generation, but topographic asymmetry has not yet been explored in a systematic manner. This work presents a comparison of tidally generated internal waves from nine different two-dimensional asymmetric topographies, consisting of a steeper Gaussian curve on one side, and a wider Gaussian curve on the other. The amplitude of the wider curve varies from 60% of the steeper curve to its equivalent. Two oscillation frequencies are tested. Kinetic energy density in tidally generated internal waves on each side of the topography is compared qualitatively and quantitatively, in both physical and Fourier space. When compared to similar symmetric topographies, waves generated by the asymmetric topographies varied distinctly in both magnitude and wavenumber distribution of kinetic energy density. Waves on the relatively steep side of the topography contain up to 50% more kinetic energy than on the wider side. However, there is very little kinetic energy at the higher wavenumbers associated with the steeper topography. Instead, the internal wavefield is dominated by lower wavenumbers, 50%–90% of the kinetic energy density is contained in wavelengths corresponding to the wider side of the topography. Decreasing the amplitude of the wider curve does not make an appreciable difference in the kinetic energy density spectrum. Thus, the differences quantified here are due solely to changing slope and show the effect which relatively slight asymmetry has on internal wave generation.

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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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