南海北部内孤立波三维数值模拟
发布时间：2019-06-24 12:17
【摘要】：过去对于南海北部源于吕宋海峡的大振幅内孤立波数值模拟研究多局限于理想地形和二维数值模拟，最新的研究表明，内孤立波在吕宋海峡的生成过程存在显著的三维特性。本文采用基于真实地形、潮汐的高分辨率三维非静力近似数值模式MITgcm，对南海北部覆盖整个吕宋海峡的内孤立波生成及其深海传播过程进行了数值模拟研究。 本文通过将模拟结果与已被广泛使用的潮汐数据集，现场纬向流速观测数据及SAR图片进行对比，验证了模拟结果的准确性。之后通过海面高度梯度的变化规律，分析了a波的三维形成过程，发现a波主要源于萨布塘岛西南侧海域所激发的内波与西侧恒春海脊中部局地激发的内波间的波波相互作用。基于斜压能通量的变化规律，发现b波主要源于台湾岛南侧与恒春海脊中北部，b波为由北向南逐渐形成，在其形成过程中存在显著的南向斜压能通量。 基于斜压能通量与多个无量纲参数，本文细致讨论了吕宋海峡中内孤立波的主要源地并评估了其生成机制，，发现吕宋海峡中内孤立波的主要源地为分布于吕宋海峡东西两座海脊的8个不同的海区，内孤立波的生成机制为混合山后波机制或内潮波机制，南海北部大振幅、长波峰线的内孤立波则源于多个不同源地内波间的波波相互作用；吕宋海峡处激发的东向传播的内孤立波主要源于东侧兰屿海脊北部。 本文通过三个敏感性实验进一步研究了K1、M2分潮对南海北部大振幅内孤立波的贡献及吕宋海峡处纬向不均匀温盐分布对南海北部大振幅内孤立波生成与传播过程的影响。结果显示，单独的K1分潮无法激发显著的内孤立波信号；在南海北部，b波主要受M2分潮支配，全日分潮对其影响很小，a波的形成则同时由全日分潮与半日分潮的共同支配；第二模态内孤立波主要受M2分潮影响，而第一模态内孤立波则由全日分潮与半日分潮的共同支配；吕宋海峡温盐分布的纬向不均匀能够显著增加西传内孤立波波列中内孤立波的数量及振幅，但不会影响吕宋海峡西传大振幅内孤立波的三维生成过程与源地，在研究，尤其是预报源自吕宋海峡的内孤立波，时应考虑其影响。
[Abstract]:In the past, the numerical simulation of large amplitude internal solitary waves in the northern South China Sea originated from Luzon Strait is mostly limited to ideal topography and two-dimensional numerical simulation. The latest research shows that the formation process of internal solitary waves in Luzon Strait has significant three-dimensional characteristics. In this paper, the high-resolution three-dimensional non-static approximate numerical model MITgcm, which is based on real topography and tide, is used to simulate the generation and deep-sea propagation of internal solitary waves covering the whole Luzon Strait in the northern South China Sea. In this paper, the accuracy of the simulation results is verified by comparing the simulation results with the tidal data set, the field zonal velocity observation data and SAR images, which have been widely used. Then, through the variation law of sea surface height gradient, the three-dimensional formation process of a wave is analyzed. It is found that the a wave mainly originates from the wave interaction between the internal wave excited by the southwest sea area of Sabutang Island and the locally excited internal wave in the middle part of the Hengchun ridge on the west side. Based on the variation of baroclinic energy flux, it is found that b wave mainly originates from the south side of Taiwan Island and the central and northern part of Hengchun ridge, and the b wave is gradually formed from north to south, and there is a significant southward baroclinic energy flux in the process of its formation. Based on baroclinic energy flux and several dimensionless parameters, the main sources of internal solitary waves in Luzon Strait are discussed in detail and their generation mechanism is evaluated. It is found that the main sources of solitary waves in Luzon Strait are eight different sea areas distributed in the east and west ridges of Luzon Strait. The generation mechanism of internal solitary waves is mixed mountain wave mechanism or internal tidal wave mechanism, and the large amplitude in the northern part of the South China Sea. The internal solitary wave of the long wave peak line originates from the wave interaction between the internal waves in many different sources. The eastward propagation of solitary waves in the Luzon Strait mainly originates from the northern part of the Orchid Ridge on the east side. In this paper, the contribution of K1, M2 tide to large amplitude internal solitary waves in the northern South China Sea and the influence of zonal uneven temperature and salt distribution in Luzon Strait on the generation and propagation of large amplitude internal solitary waves in the northern part of the South China Sea are further studied by three sensitivity experiments. The results show that the K1 tide alone can not stimulate the significant internal solitary wave signal, in the northern part of the South China Sea, the b wave is mainly dominated by M2 tide, and the formation of a wave is dominated by both the full diurnal tide and the semidiurnal tide, while the solitary wave in the second mode is mainly influenced by M2 tide, while in the first mode, the solitary wave is dominated by the full diurnal tide and the semidiurnal tidal wave, while in the northern part of the South China Sea, the b wave is mainly dominated by M2 tide, and the formation of a wave is dominated by both the full diurnal tide and the semidiurnal tide. The zonal inhomogeneity of temperature and salt distribution in Luzon Strait can significantly increase the number and amplitude of internal solitary waves in westward solitary wave train, but it will not affect the three-dimensional generation process and source of large amplitude internal solitary waves in Luzon Strait. In the study, especially in the prediction of internal solitary waves from Luzon Strait, its influence should be taken into account.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P731.2
本文编号：2505057
[Abstract]:In the past, the numerical simulation of large amplitude internal solitary waves in the northern South China Sea originated from Luzon Strait is mostly limited to ideal topography and two-dimensional numerical simulation. The latest research shows that the formation process of internal solitary waves in Luzon Strait has significant three-dimensional characteristics. In this paper, the high-resolution three-dimensional non-static approximate numerical model MITgcm, which is based on real topography and tide, is used to simulate the generation and deep-sea propagation of internal solitary waves covering the whole Luzon Strait in the northern South China Sea. In this paper, the accuracy of the simulation results is verified by comparing the simulation results with the tidal data set, the field zonal velocity observation data and SAR images, which have been widely used. Then, through the variation law of sea surface height gradient, the three-dimensional formation process of a wave is analyzed. It is found that the a wave mainly originates from the wave interaction between the internal wave excited by the southwest sea area of Sabutang Island and the locally excited internal wave in the middle part of the Hengchun ridge on the west side. Based on the variation of baroclinic energy flux, it is found that b wave mainly originates from the south side of Taiwan Island and the central and northern part of Hengchun ridge, and the b wave is gradually formed from north to south, and there is a significant southward baroclinic energy flux in the process of its formation. Based on baroclinic energy flux and several dimensionless parameters, the main sources of internal solitary waves in Luzon Strait are discussed in detail and their generation mechanism is evaluated. It is found that the main sources of solitary waves in Luzon Strait are eight different sea areas distributed in the east and west ridges of Luzon Strait. The generation mechanism of internal solitary waves is mixed mountain wave mechanism or internal tidal wave mechanism, and the large amplitude in the northern part of the South China Sea. The internal solitary wave of the long wave peak line originates from the wave interaction between the internal waves in many different sources. The eastward propagation of solitary waves in the Luzon Strait mainly originates from the northern part of the Orchid Ridge on the east side. In this paper, the contribution of K1, M2 tide to large amplitude internal solitary waves in the northern South China Sea and the influence of zonal uneven temperature and salt distribution in Luzon Strait on the generation and propagation of large amplitude internal solitary waves in the northern part of the South China Sea are further studied by three sensitivity experiments. The results show that the K1 tide alone can not stimulate the significant internal solitary wave signal, in the northern part of the South China Sea, the b wave is mainly dominated by M2 tide, and the formation of a wave is dominated by both the full diurnal tide and the semidiurnal tide, while the solitary wave in the second mode is mainly influenced by M2 tide, while in the first mode, the solitary wave is dominated by the full diurnal tide and the semidiurnal tidal wave, while in the northern part of the South China Sea, the b wave is mainly dominated by M2 tide, and the formation of a wave is dominated by both the full diurnal tide and the semidiurnal tide. The zonal inhomogeneity of temperature and salt distribution in Luzon Strait can significantly increase the number and amplitude of internal solitary waves in westward solitary wave train, but it will not affect the three-dimensional generation process and source of large amplitude internal solitary waves in Luzon Strait. In the study, especially in the prediction of internal solitary waves from Luzon Strait, its influence should be taken into account.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P731.2
【参考文献】
相关期刊论文 前5条
1 蔡树群;何建玲;谢皆烁;;近10年来南海孤立内波的研究进展[J];地球科学进展;2011年07期
2 宋德海;鲍献文;张少峰;张春华;;基于FVCOM的廉州湾及周边海域三维潮汐潮流数值模拟[J];海洋通报;2012年02期
3 赫崇本,管秉贤;南海中部NE-SW向断面海水热盐结构以及海盆冷水来源的分析[J];海洋与湖沼;1984年05期
4 夏华永;刘愉强;杨阳;;南海北部沙波区海底强流的内波特征及其对沙波运动的影响[J];热带海洋学报;2009年06期
5 ;A 2D-numerical modeling of the generation and propagation of internal solitary waves in the Luzon Strait[J];Acta Oceanologica Sinica;2010年06期
本文编号：2505057
本文链接：https://www.wllwen.com/kejilunwen/haiyang/2505057.html
