南海内孤立波的周期特性分析

An Analysis of Periodicity of Internal Solitary Waves in South China Sea

针对非线性、大振幅的海洋内孤立波的结构组成问题,采用南海内孤立波的实测数据,利用希尔伯特-黄变换方法,分析了内孤立波的流场结构与其模态的周期性之间的联系.结果表明:第三模态周期性明显,频率与幅值变化比较稳定.

In light with the structure of nonlinear and large amplitude internal solitary waves in the ocean,the relations between the flow field structure of internal solitary waves and their periodic characteristics of empirical mode decomposition are analyzed by means of the measurement data from South China Sea and the method of Hilbert-Huang transform（HHT）.The results show that the periodicity of the third mode is obvious and the changes of its frequency and amplitude are steady.