西北太平洋浪流相互作用对有效波高的影响研究

西北太平洋强流区会对海浪的特征和分布产生显著的影响，尤其是研究台风过程中海流与海浪的相互作用具有重要的研究意义。本文以ROMS海洋模式和SWAN海浪模式为基础，构建了浪流耦合模式系统，对2013年10月6-17日间的台风“丹娜丝”、“百合”、“韦帕”过程中西北太平洋浪流相互作用中海流对有效波高的影响进行了研究。通过对比模式模拟有效波高与浮标观测资料，发现耦合后的有效波高比非耦合结果更接近观测值，耦合模式中海流的存在对有效波高的分布有明显的影响。研究表明，特别是在有效波高峰值处，海流引起的有效波高增大最大可达1 m。海浪浪向及流向的空间分布以及中国近海浮标处浪向与流向的时间序列表明，流向与浪向反向时，海流的影响造成有效波高增大；二者同向时，有效波高减小。海流对有效波高的调整会沿着海浪传播的方向传播相当一段距离。在西北太平洋的海浪场计算中，引入海流的耦合模式计算结果对改善强流区海浪预报具有重要意义，并且海流的模拟精度对于高精度的海浪预报非常重要。

A study of the influence of wave-current interaction on significant wave height in the Northwestern Pacific

Strong ocean current in the Northwestern Pacific has significant impact on the characteristics and distribution of ocean wave, especially during typhoon. A coupled current-wave modeling system based on the ROMS model and SWAN model is applied to study the current-induced modulation of significant wave height by wave-current interaction during Typhoon Danas, Typhoon Nari and Typhoon Wipha through October 6-17, 2013. The results indicated that the ocean current had significant impact on the simulation of significant wave height in the coupled modeling system. The significant wave height is closer to buoy observation when wave and current are coupled. The maximum enhanced significant wave height due to current is up to 1 m. It''s indicated that the significant wave height always increases (decreases) when the wave direction is against (along) the background ocean current. And the effects of wave-current interactions are not only local but also spread a long distance with the propagation of wave. The wave-current coupled modeling system is important for wave forecasting in the Northwestern Pacific. The current induced in the coupled modeling system would contribute to high-precision ocean wave forecast.