张培超, 王刚, 戴德君, 等, xxxx. 安达曼海南部内孤立波生成与传播的三维数值模拟[J]. 海洋科学进展, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20230621001.
引用本文: 张培超, 王刚, 戴德君, 等, xxxx. 安达曼海南部内孤立波生成与传播的三维数值模拟[J]. 海洋科学进展, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20230621001.
ZHANG P C, WANG G, DAI D J, et al, xxxx. Three-dimensional numerical study of internal solitary waves in the southern Andaman Sea[J]. Advances in Marine Science, x(x): xx-xx. DOI: 10.12362/j.issn.1671-6647.20230621001
Citation: ZHANG P C, WANG G, DAI D J, et al, xxxx. Three-dimensional numerical study of internal solitary waves in the southern Andaman Sea[J]. Advances in Marine Science, x(x): xx-xx. DOI: 10.12362/j.issn.1671-6647.20230621001

安达曼海南部内孤立波生成与传播的三维数值模拟

Three-Dimensional Numerical Study of Internal Solitary Waves in the Southern Andaman Sea

  • 摘要: 安达曼海内孤立波频发且振幅较大,对海洋生态、海上活动等有重要影响。本文采用非静力近似的MIT通用环流模式(MITgcm),并结合遥感影像研究了安达曼海南部内孤立波的生成与传播过程。数值模拟结果表明,格雷特海峡、尼科巴群岛之间的水道、苏门答腊岛北部陆坡以及苏门答腊岛东北部陆坡是安达曼海南部内孤立波的4个主要生成源地,与遥感影像结果一致。本文还利用敏感性数值实验探究了二维模拟、潮流强度、地形结构等对该海域内孤立波生成与传播的影响。数值实验中,安达曼海内孤立波传播速度在2.3~2.6 m/s,振幅最大可达70 m,背景潮流越强,所生成的内孤立波列中内孤立波的数量越多、振幅越大,但相邻内孤立波之间的时间间隔变短。局地地形敏感性研究还发现双海脊能增强内孤立波的振幅和流速,并且对生成的内孤立波数量有较大影响。

     

    Abstract: Internal solitary waves (ISWs) with large amplitudes frequently occur in the Andaman Sea and have important impacts on marine ecology and maritime activities. In this work, the generation and propagation of the ISWs in the southern Andaman Sea are studied with the non-hydrostatic MIT general circulation model (MITgcm). Remote sensing images are used to validate the numerical simulations. First, we investigate the source and propagation speed of the ISWs and find that the ISWs are mainly generated in the following four locations in the Andaman Sea: the Great Channel, the channel between the Nicobar Islands, the shallow water channel at the northern continental slope of the Sumatra Island, and the ridge near the continental slope of northeastern Sumatra Island. These locations are consistent with those observed with remote sensing images. The generation of ISWs is subject to the baroclinic tide regime. Second, we designed sensitivity experiments to investigate the impacts of 2D model effect, strength of background tidal current and structure of topography on the generation and propagation of the ISWs. The simulations show that the propagation speed of the ISWs is between 2.3 and 2.6 m/s, and the maximum amplitude is up to 70 m. By increasing the intensity of background currents in the numerical model, the number of ISWs in each wave packet increases, wave amplitudes become larger and the time interval between adjacent waves shortens. By modifying the local topography in the numerical model, we find that the double-ridge structure can increase the amplitude and the number of ISWs comparing to a single ridge topography.

     

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