| 基于客观方法的海洋三维涡旋核心线提取 |
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| 引用本文： | 田丰林,李博涵,田万林,唐蓦然,马颖.基于客观方法的海洋三维涡旋核心线提取[J].海洋通报,2024(2). |
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| 作者姓名： | 田丰林 李博涵 田万林 唐蓦然 马颖 |
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| 作者单位： | 自然资源部城市国土资源监测与仿真重点实验室，广东 深圳 518034；中国海洋大学 海洋技术学院 深海圈层与地球系统前沿中心，山东 青岛 266100；青岛海洋科学与技术试点国家实验室 区域海洋动力学与数值模拟功能实验室，山东 青岛 266237;深圳市海洋发展研究促进中心，广东 深圳 518000 |
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| 基金项目： | 自然资源部城市国土资源监测与仿真重点实验室开放基金资助课题（KF-2020-05-085）；崂山实验室科技创新项目“基于人工智能的孪生海洋关键技术与应用示范”（LSKJ202204303）；中欧龙计划5科技合作项目（58393） |
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| 摘 要： | 涡旋核心线是海洋中尺度涡旋结构的重要组成要素，涡旋核心线提取和可视化对于切入中尺度涡三维结构研究、开展海洋物质能量垂直运输分析具有重要意义。本文基于客观参考框架和准则，提出了使用客观化的流场参数得到区域，并提取其山谷线作为涡旋核心线的方法，实现了对海洋三维结构中尺度涡旋核心线的提取和可视化。首先，引入了最优局部参考系，使速度、速度梯度等测度转换为在运动的参考系下保持不变的客观量，提升了在海洋科学实践中的可靠性和实用性。其次，针对含有垂向速度的海洋三维流场数据，计算其空间雅可比矩阵，展示了涡旋核心区域的三维结构，实现了海洋涡旋研究从二维到三维的提升。最后，分别在多个半径大小播撒流线种子点，分析不同旋转方向的涡旋，对已提取的涡旋核心线实验结果进行验证，证明了客观海洋三维涡旋核心线提取方法的有效性及可行性。
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| 关 键 词： | 海洋流场 涡旋核心线 客观性 三维结构 |
| 收稿时间： | 2023/1/6 0:00:00 |
| 修稿时间： | 2023/4/24 0:00:00 |
Oceanic 3D Vortex Coreline extraction using the Objective method |
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| LI Zhishang,TIAN Fenglin,LI Bohan,TIAN Wanlin,MA Ying.Oceanic 3D Vortex Coreline extraction using the Objective method[J].Marine Science Bulletin,2024(2). |
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| Authors: | LI Zhishang TIAN Fenglin LI Bohan TIAN Wanlin MA Ying |
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| Institution: | Key Laboratory of Urban Land Resources Monitoring and Simulation, Ministry of Natural Resources, Shenzhen 518034, China; Frontiers Science Center for Deep Ocean Multispheres and Earth System, School of Marine Technology, Ocean University of China, Qingdao 266100, China; Laboratory for Regional Oceanography and Numerical Modeling, Laoshan Laboratory, Qingdao 266000, China;Shenzhen Marine Development Research Promotion Center, Shenzhen 518000, China |
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| Abstract: | Vortex corelines are an important component of the oceanic mesoscale eddy structure. The extraction and visualization of the vortex corelines are of great significance for the study of the three-dimensional structure of the mesoscale eddies and the analysis of the oceanic material and energy vertical transport. Based on the objective reference frame and the criterion, this paper proposes a method to obtain the region using the objective flow field parameters; and extract its valley line as the vortex coreline. Firstly, the optimal local reference system is introduced, allowing measurements such as velocity and velocity gradients to be converted into objective quantities that remain constant under a moving reference frame, enhancing their reliability and practicality in the practice of marine science. Secondly, for the three-dimensional ocean flow field data with vertical velocity, the spatial Jacobian matrix is ??calculated, which shows the three-dimensional structure of the vortex core region, and realizes the improvement of ocean vortex research from two-dimensional to three-dimensional. Finally, the experimental results of the extracted vortex corelines are verified by the analysis of vortexs in the different rotation directions and the different radius of streamline seed points, which proves the effectiveness and feasibility of the objective ocean three-dimensional vortex coreline extraction method. |
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| Keywords: | ocean flow field vortex coreline objectivity three-dimensional structure |
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