Laboratory experiments on depression interfacial solitary waves over a trapezoidal obstacle with horizontal plateau
Laboratory experiments on depression interfacial solitary waves over a trapezoidal obstacle with horizontal plateau
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DOI：
10.1016/j.oceaneng.2010.02.016
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发表时间：
2010-06
影响因子：
5
通讯作者：
M. Cheng;J. R. Hsu
中科院分区：
文献类型：
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作者：
M. Cheng;J. R. Hsu
当在分层海洋的深水中浅水时，内波可能会遇到不同类型的海底地形。在传播过程中，波浪可能在斜坡上产生涡旋运动，在上层和底层之间产生湍流混合，甚至在斜坡-陆架特征的平台上产生波形反转。虽然许多海洋学家认为，从上、下两层深度相等的转折点可能开始从凹陷到海平面的反转，但这一现象尚未在野外观测或数值方案中得到充分验证。为了弄清这一独特的现象，进行了一系列的室内实验，研究了坡面上凹陷的界面孤立波随坡面上水平平台的演化过程。实验结果表明，高原长度可以作为判断倒置波形能否维持强度或迅速减弱的指标，从而对当地海洋环境生态产生直接影响。文中还对内部流场进行了比较，说明了内波在梯形、三角形和均匀长坡上传播时的波形反转过程。
While shoaling from deep water in a stratified ocean, an internal wave may encounter different types of submarine topography. As it travels, the wave may generate vortex motion on a slope, turbulent mixing between the upper and bottom layer, and even waveform inversion on the plateau of a slope-shelf feature. Although many oceanographers have believed that the inversion from depression to elevation may commence at the turning point where the upper and low layer are equal in depth, this phenomenon has not been fully verified in field observations or numerical schemes. In order to clarify this unique phenomenon, a series of laboratory experiments were conducted on the evolution of an interfacial solitary wave of depression across a slope followed by a horizontal plateau on slope-shelf obstacle. Experimental results indicate the length of the plateau may become a proxy to determine whether the inverted waveform could maintain its strength or be weakened swiftly, which could inflict direct impact on the ecology of the local oceanic environment. Comparison on the internal flow field is also presented in this paper to illustrate the process of waveform inversion as an internal wave propagating over a trapezoidal, triangular ridge and uniform long slope, respectively.