| 任伯迁，王振鲁，梁丙臣，谢波涛，吕英康，齐静静，徐兴雨.南海北部陆坡处沙波对内孤立波极性转换动力响应机制研究[J].海洋工程,2026,(1):35~48 |
| 南海北部陆坡处沙波对内孤立波极性转换动力响应机制研究 |
| Dynamic response mechanism of sand waves to polarity conversion of internal solitary waves on the northern slope of the South China Sea |
| 投稿时间：2024-11-19 修订日期：2025-03-11 |
| DOI：10.16483/j.issn.1005-9865.2026.01.004 |
| 中文关键词: 南海北部 沙波迁移 内孤立波 极性转换 MITgcm Delft3D |
| 英文关键词:northern South China Sea sand wave migration internal solitary waves polarity conversion MITgcm Delft3D |
| 基金项目:国家自然科学基金项目（52101338） |
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| 中文摘要: |
| 南海北部陆坡130~310 m水深区域发育的沙波会在内孤立波的影响下发生迁移演化。基于MITgcm非静压数值模式构建了南海内孤立波数值模型，模拟了内孤立波的传播特征，发现内孤立波在南海北部陆坡区域发生了极性转换，模拟结果表明不同位置处不同极性内孤立波流速剖面的形态特征和海底流速方向存在较大差异。研究区域180 m水深处存在一个地形陡变的坡折，根据实测高精度水深数据，发现坡折以上较浅水域与坡折以下较深水域的沙波迁移方向相反。基于Delft3D数值模型，构建了垂向二维沙波迁移模型，结合内孤立波模型模拟的底层流速，选取研究区域内不同位置的典型沙波断面，分析了内孤立波作用下沙波迁移趋势。研究结果表明内孤立波极性转换是控制研究区域沙波迁移的重要因素，内孤立波沿大陆架传播浅化过程中下凹型内孤立波转变为上凸型内孤立波。下凹型内孤立波的底部流速为SE方向，海底沙波会受到沿陆坡向下的强流影响，导致水深较深海域的沙波向海迁移；上凸型内孤立波的底部流速为NW方向，海底沙波会遭受沿陆坡向上的强流影响，导致水深较浅海域的沙波向岸迁移。 |
| 英文摘要: |
| The sand waves developed in the water depth of 130 to 310 m zone of the northern slope of the South China Sea migrate and evolve under the influence of internal solitary waves. Based on the MITgcm non-hydrostatic numerical model, the numerical model of internal solitary waves in the South China Sea was constructed to simulate the propagation characteristics of internal solitary waves,revealing a polarity conversion in the northern slope area of the South China Sea. The simulation results show that there are significant differences in the morphological characteristics of the velocity profile and the direction of the seabed velocity for different polar internal solitary waves at different locations. A steep slope break occurs at 180 m water depth in the study area. High-resolution bathymetric data show that the sand wave migration direction in the shallow zone above the slope break is opposite to that in the deeper zone below the slope break. Based on the Delft3D model, a vertical two-dimensional sand wave migration model was developed. Combined with bottom velocities simulated by the internal solitary wave model, typical sand wave cross-sections at different positions in the study area were selected to examine migration trends under internal solitary wave forcing. The results show that polarity conversion of internal solitary waves is an important factor controlling the migration of sand waves in the study area. During shoaling propagation along the continental slope, concave internal solitary waves transform into convex ones. The bottom velocity of the concave internal solitary waves was in the SE direction,and the submarine sand waves were affected by the strong current downward along the slope, inducing sand waves in the deeper waters to migrate seaward. The bottom velocity of the convex internal solitary waves was in the NW direction,and the submarine sand waves were affected by the strong current upward along the slope, causing the sand waves in the shallower waters to migrate landward. |
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