内波远距离传播演化的实验研究

发布时间：2018-02-22 01:11

  本文关键词： 内波实验 垂向模态 PIV技术 相位干涉　出处：《海洋与湖沼》2017年03期 　论文类型：期刊论文

【摘要】：为了研究内波远距离传播过程中的演化规律,本文采用图像测速法(PIV)分别对内波近场和远场的速度场进行测量。实验中同时采用两台CCD相机对实验区域进行拍摄,根据实验结果对内波能量和垂向模态结构进行计算分析。实验结果表明,在近场区域生成的内波主要表现为内波射线结构。内波射线在经过海表面反射后,其能量在空间上出现非对称结构,能量在加强区域较减弱区增加约15%。在远场,内波射线结构不再清晰,内波主要表现为低模态内波结构。内波射线在反射时能量衰减显著,损失约为50%;低模态内波可以离开内波生成源地远距离传播,传播过程中能量损失较小,在远场传播过程中(第一模态内波半波长的距离)能量损失约20%。低模态内波的传播相速度介于垂向第一模态和第二模态相速度之间。
[Abstract]:In order to study the evolution law of internal wave during long distance propagation, this paper uses image velocimetry to measure the velocity field of internal wave near field and far field respectively. Two CCD cameras are used to photograph the experimental area. According to the experimental results, the internal wave energy and the vertical mode structure are calculated and analyzed. The experimental results show that the internal waves generated in the near field are mainly the internal wave ray structure, and the internal wave rays are reflected through the sea surface. In the far field, the internal wave ray structure is no longer clear, and the internal wave is mainly characterized by low mode internal wave structure. The loss is about 50. The low mode internal wave can propagate far away from the source of the internal wave, and the energy loss in the process of propagation is relatively small. In the process of far-field propagation, the energy loss (the distance of half wavelength of the first mode internal wave) is about 20. The phase velocity of the low mode internal wave is between the vertical first mode and the second mode.
【作者单位】： 东海舰队海洋水文气象中心;中国海洋大学物理海洋教育部重点实验室;
【基金】：国家自然科学基金项目,41476001号,41276008号
【分类号】：P731.24
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本文编号：1523296