MONTHLY VARIATION OF OCEAN DYNAMICS ALONG QIONGHAI COAST AND ITS INFLUENCE ON SEABED EVOLUTION
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摘要:
采用区域海洋模型ROMS在琼海沿岸建立了三维动力模型，在水动力验证的基础上模拟了琼海沿海海洋动力过程的月际变化，研究了季节性风场作用下海洋动力结构的响应过程与机制，揭示了琼海沿岸上升流的季节性发育特征，探讨了海洋动力结构的空间特征对琼海沿海地区海床冲淤的影响。结果表明，琼海沿海海洋动力过程具有明显的季节性特征，冬、夏季强，春秋季弱；冬季表层流场与底层流场的结构和流向基本一致，表层流速远高于底层流速；夏季，由于风生上升流的发育，表层流场与底层流场结构发生显著差异。沿岸地区波致剪应力较强，南北两侧流致剪应力较强，使得琼海沿岸和滨海区南北两侧成为易受冲刷的高风险区，研究区中部和东南部外海是主要的淤积区域。
Abstract:The Regional Ocean Modeling System (ROMS) is used in this paper to construct a three-dimensional dynamic model for the Qionghai coast. Based on hydrodynamic verification, the monthly variations of coastal marine dynamic process are simulated, and the response process of the marine dynamic structure to the seasonal wind fields studied. The study revealed the seasonal upwelling current along the Qionghai coast, and discussed the influence of the spatial marine dynamic structure on the erosional and depositional pattern of the coastal area. The results show that the Qionghai coastal ocean dynamic process has obvious seasonal features. It is strong in winter and summer, but weak in spring and autumn. In winter, the structure and direction of the surface and bottom flow fields are basically the same, but surface velocity is much higher than the bottom. In summer, however, due to the development of wind-induced upwelling, the surface flow field and the bottom flow field structure are significantly different. The wave-induced shear stress is relatively strong in the coastal area, and the current-induced shear stress is relatively strong on the north and south sides, making the Qionghai coast and the north and south sides of the coastal area a high-risk area vulnerable to erosion. The central and southeastern part of the study area, however, remain under deposition.
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Key words:
- Qionghai coast /
- ocean dynamic /
- monthly variation /
- ROMS
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