热带气旋风场非对称性对表面海浪场的影响-海洋预报

热带气旋风场非对称性对表面海浪场的影响

单位：1. 国家海洋局烟台海洋环境监测中心站, 山东烟台 264006;
2. 中国海洋大学, 山东青岛 266100

分类号：P444

出版年·卷·期（页码）：2014·31·第二期（1-7）

摘要：

用WAVEWATCHIII海浪模拟了5个不同风场结构的热带气旋下海浪平均要素和海浪方向谱来研究其对风场非对称性的响应。结果表明热带气旋诱发的海浪场对风场的非对称性很敏感。随着风场非对称性加强,有效波高除了左前象限增加以外在其他所有象限内都减小,且有效波高场的非对称性增强,并且非对称轴逆时针旋转,同时,有效波高最大值的位置向前移动。风场的非对称性对其他平均要素也有影响,尤其在左后象限最明显,例如平均波长,平均波向,波峰方向等。风场的非对称性对海浪谱的多峰性以及主导波的频率和传播方向都有很重要的影响。

Five numerical experiments are carried out to investigate the impacts of tropical cyclone (TC) on ocean surface waves using WAVEWATCH III wave model. The results indicate that the asymmetry of wind (AW) can increase the asymmetry of Hs field by increasing the significant wave height (Hs) in the left-front quadrant while reducing the significant wave height (Hs) in other three quadrants. Meanwhile, the position of maximum Hs moves forward. The AW can also affect other mean wave parameters, such as mean wavelength, mean wave direction and mean period, especially in the left-rear quadrant. The AW has a significant impact on the multi-modal pattern of the wave directional spectra, as well as the frequency and spreading direction of dominant waves.

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