| 摘要: |
| 基于实验室水槽实验，研究了内孤立波在海底山脊地形存在下的破碎过程。实验设置了两层流体的分层环境，定量地控制了上下层水体厚度及密度，使用不同高度的高斯地形模拟实际的海山作用，讨论了不同高度地形作用下内孤立波破碎过程的异同。实验结果表明，内孤立波的破碎过程中由于逆压梯度的存在，在地形处发生边界层分离，产生了底边界层反向射流和涡脱落现象，计算了内孤立波破碎过程中产生的底部切应力的分布。本文通过实验模拟了内孤立波再海山作用下的破碎过程，进一步探究了海山对内孤立波破碎的影响和底部切应力的作用，对于研究自然界中海洋内孤立波在海山区域的破碎现象有参考价值。 |
| 关键词: 内孤立波 内波破碎 边界层分离 底床切应力 |
| DOI：10.11693/hyhz20201000299 |
| 分类号:P731.24 |
| 基金项目:国家重点研发计划，2016YFC1401404号，2017YFC1405100号；国际海域资源调查与开发“十三五”课题“西太海山区物理海洋环境及典型海山流场结构”，DY135-E2-2-02号；舟山市科技计划项目浙江大学海洋学院专项，2018C81034号。 |
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| EXPERIMENTAL STUDY ON INTERNAL SOLITARY WAVE BREAKING UNDER SUBMARINE RIDGE |
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LIN Ying-Dian, YU Jun-Yang, LUO Yuan-Ye, YUAN Ye-Ping
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Ocean College, Zhejiang University, Zhoushan 316000, China
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| Abstract: |
| Based on our laboratory flume experiment, the breaking process of internal solitary waves in the presence of submarine ridge and the turbulence generated by wave breaking were studied. In the experiment, the stratified environments of two-layered fluid were set up, and the thickness and density of upper and lower water bodies were quantitatively controlled. The Gaussian terrain with different heights was used to simulate the actual submarine ridge, and the similarities and differences of internal solitary wave breaking process under different heights of submarine ridge were discussed. The experimental results show that the boundary layer separation occurred in the terrain due to the existence of the inverse pressure gradient during the breaking of the internal solitary wave, resulting in the reverse jet and vortex shedding in the bottom boundary layer. The distribution of bottom shear stress during the breaking processes of internal solitary wave breaking was also calculated. In addition, the breaking process of internal solitary waves under the action of submarine ridge was simulated in the experiment, and the influence of ridge on the breaking process and the effect of bottom shear stress were estimated. This study shall enhance our understanding of internal solitary wave breaking under the influence of submarine ridge. |
| Key words: Internal solitary wave internal wave breaking boundary layer separation bottom shear stress |
