海洋条带结构的揭示和特征研究
发布时间：2018-08-19 15:31
【摘要】：海洋条带结构是近来物理海洋学研究的一个热点。在海洋中,条带结构往往被大尺度环流过程所掩盖。把这种隐蔽的海水运动现象显现出来的办法是对时间平均的速度场进行空间滤波。条带结构很可能是湍流有序性的一种表现形式,对其深入的研究有助于解决湍流这一世纪难题。而且海洋中的条带结构的有助于物质和能量沿流动方向的输运,同时能够抑制垂直于流动方向的混合。因此对于海洋条带结构的研究有着不可忽视的意义。本文从获取条带结构方法入手,揭示了条带结构在全球方法内不同尺度下的分布特征,并就一些显著特征进行动力学分析。主要结论如下:1.就揭示海洋条带结构的一维方法而言,本文新采用的切比雪夫滤波方法解决了现有方法的一些缺陷,更加适宜于获取这种隐藏的运动。2.二维滤波方法更优于一维方法,因为其考虑的数据场两个方向上的联系,并且其最终结果不依赖于滤波窗口的选择。滤波的参数并不唯一,它取决于所分析数据场的物理特征。3.条带结构广泛存在于全球海洋中,无论是开阔的大洋还是孤立的海盆,但是两者之间有着显著差异。4.针对海洋条带结构在全球不同海域内所表现出来的走向的多样性问题,本文采用位涡理论证实了条带结构的走向取决于等位涡线的分布。
[Abstract]:The structure of ocean strip is a hot spot in the field of physical oceanography recently. In the ocean, strip structures are often masked by large-scale circulation processes. The method to show the hidden sea water motion is to filter the time-averaged velocity field in space. Strip structure is likely to be a form of turbulence orderliness, and its in-depth study is helpful to solve the problem of turbulence in the century. Moreover, the belt structure in the ocean is conducive to the transport of matter and energy along the flow direction and can restrain the mixing perpendicular to the flow direction. Therefore, the study of the ocean strip structure can not be ignored. Starting with the method of obtaining strip structure, this paper reveals the distribution characteristics of strip structure at different scales within the global method, and makes dynamic analysis on some notable characteristics. The main conclusions are as follows: 1. As far as the one-dimensional method to reveal the structure of the ocean strip is concerned, the new Chebyshev filtering method, which is adopted in this paper, solves some defects of the existing methods and is more suitable for obtaining the hidden motion. 2. The two-dimensional filtering method is better than the one-dimensional method because it considers the relationship between the two directions of the data field and the final result is independent of the filter window selection. Filter parameters are not unique, it depends on the physical characteristics of the data field analyzed. The banded structure is widely distributed in the global oceans, both in the open ocean and in the isolated basin, but there is a significant difference between the two. Aiming at the diversity of ocean stripe structure in different sea areas around the world, the potential vortex theory is used to prove that the direction of strip structure depends on the distribution of isotropic vortices.
【学位授予单位】：浙江海洋学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P731.2
本文编号：2192085
[Abstract]:The structure of ocean strip is a hot spot in the field of physical oceanography recently. In the ocean, strip structures are often masked by large-scale circulation processes. The method to show the hidden sea water motion is to filter the time-averaged velocity field in space. Strip structure is likely to be a form of turbulence orderliness, and its in-depth study is helpful to solve the problem of turbulence in the century. Moreover, the belt structure in the ocean is conducive to the transport of matter and energy along the flow direction and can restrain the mixing perpendicular to the flow direction. Therefore, the study of the ocean strip structure can not be ignored. Starting with the method of obtaining strip structure, this paper reveals the distribution characteristics of strip structure at different scales within the global method, and makes dynamic analysis on some notable characteristics. The main conclusions are as follows: 1. As far as the one-dimensional method to reveal the structure of the ocean strip is concerned, the new Chebyshev filtering method, which is adopted in this paper, solves some defects of the existing methods and is more suitable for obtaining the hidden motion. 2. The two-dimensional filtering method is better than the one-dimensional method because it considers the relationship between the two directions of the data field and the final result is independent of the filter window selection. Filter parameters are not unique, it depends on the physical characteristics of the data field analyzed. The banded structure is widely distributed in the global oceans, both in the open ocean and in the isolated basin, but there is a significant difference between the two. Aiming at the diversity of ocean stripe structure in different sea areas around the world, the potential vortex theory is used to prove that the direction of strip structure depends on the distribution of isotropic vortices.
【学位授予单位】：浙江海洋学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P731.2
【参考文献】
相关期刊论文 前1条
1 HUANG Rui-xin;;Evolution of oceanic circulation theory: From gyres to eddies[J];热带海洋学报;2013年02期
，本文编号：2192085
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