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
张培超 1王刚 1戴德君 2乔方利 2黄传江2
作者信息
- 1. 自然资源部第一海洋研究所,山东青岛 266061;自然资源部海洋环境科学与数值模拟重点实验室,山东青岛 266061
- 2. 自然资源部第一海洋研究所,山东青岛 266061;自然资源部海洋环境科学与数值模拟重点实验室,山东青岛 266061;山东省海洋环境科学与数值模拟重点实验室,山东青岛 266061
- 折叠
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.
关键词
安达曼海/内孤立波/非静力近似Key words
the Andaman Sea/internal solitary waves/non-hydrostatic引用本文复制引用
基金项目
国家重点基础研究发展计划项目(2022YFC2808304)
国家自然科学基金项目(41821004)
出版年
2024
NETL
NSTL
万方数据