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首页> 外文期刊>Ocean Dynamics >Characteristics of coastal trapped waves along the northern coast of the South China Sea during year 1990
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Characteristics of coastal trapped waves along the northern coast of the South China Sea during year 1990

机译：1990年南海北部沿海沿海被困波的特征

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摘要

The structures and evolution of the coastal trapped waves (CTW) along the northern coast of the South China Sea (SCS) in the year 1990 are studied using observed hourly sea level records collected from four sites around the northern SCS and a three-dimensional numerical model with realistic bathymetry and wind forcing. Analysis of the yearlong records of the observed sea level data indicates that the sea level variations are highly correlated between the stations and the sea level variability propagates southwestward along the coast. The sea level signals travel ing from northeast to southwest along the coast with a propagation speed of 5.5-17.9 ms~(-1) during both the ty phoon season and the winter month show the characteristics of a CTW. The wave speed is faster between stations Shanwei and Zhapo than that between Xiamen and Shanwei. Sea level variations during both typhoon season and winter month are reasonably well represented by the numerical model. The model runs focused on the wave signals related to typhoons and winter storm show that the CTW propagating southwestward along the coast can be reinforced or decreased by the local wind forcing during its propagation and there are apparent differences in the propagation characteristics between the waves along the mainland and those traveling around Hainan Island. The abrupt change of the shelf width and coastline around Leizhou Peninsula and Hainan Island are responsible for strong scattering of CTWs from one mode into higher modes. The alongshore velocities across different transects associated with CTW are investigated to examine the verti cal structures of the waves. The alongshore velocity struc tures at transects during different events are related to the combined effect of stratification and shelf profile, which can be estimated using the Burger number. The empirical or thogonal function analysis of alongshore velocity and nodal lines of the mode structure suggest mode two CTWs in transect S2 during typhoon season and mode 1 CTWs during winter. Sensitivity model experiments are also per formed to demonstrate the effects of local wind and topog raphy on the wave propagation.
机译：利用从南海北部四个地点收集到的每小时海平面观测资料和三维数值，研究了1990年南海北部沿海沿岸的捕获海浪（CTW）的结构和演化。具有逼真的测深和风力的模型。对一年来观测到的海平面数据记录的分析表明，各站之间的海平面变化高度相关，并且海平面变化沿海岸向西南传播。在台风季节和冬季月份，海平面信号从东北向西南沿海岸传播，传播速度为5.5-17.9 ms〜（-1），这表明了CTW的特征。汕尾站与乍浦站之间的波速比厦门站和汕尾站之间的波速快。数值模型可以很好地表示台风季节和冬季月份的海平面变化。该模型集中在与台风和冬季风暴有关的波浪信号上，表明沿海岸向西南传播的CTW在传播过程中可被局部风强迫增强或减小，并且沿海岸传播的波之间的传播特性存在明显差异。大陆和海南岛周围的人。雷州半岛和海南岛周围的陆架宽度和海岸线的突然变化是造成CTW从一种模式向更高模式的强烈散布的原因。研究了与CTW相关的不同横断面的近岸速度，以检查波浪的垂直结构。在不同事件期间，样带处的沿岸速度结构与分层和层架剖面的组合效应有关，可以使用伯格数来估计。沿岸速度和模式结构的节点线的经验或正交函数分析表明，在台风季节，S2断面的模式为两个CTW，冬季为模式1的CTW。还进行了敏感性模型实验，以证明局部风和地形对波传播的影响。

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