海浪方向谱阵列资料实例分析

A Practical Analysis of Array Measurement Data of Sea Wave Directional Spectrum

根据傅氏级数展开法和贝叶斯方法，对现场获得的阵列资料进行了方向谱实例分析。结果表明，实测风浪方向谱能量的相对分布与相应的波场类型密切相关。涌浪和由稳定风场引起的风浪方向谱各组成波能量相对于方向呈单峰对称分布。大风引起的风浪方向谱能量的相对分布，虽也近似为单峰，但对称性差。不同波场类型的风浪方向谱各组成波的谱密度极值方向不同，表明不同频率的组成波有不同的主方向。

Using Fourier series expansion and Bayesine Methods, we have made a directional spectrum analysis of the array measurement data obtained in situ. The results indicate that the relative distribution of the field wind wave directional spectrum energy is closely related to the corresponding types of wave state. Each wave energy component of the swell spectrum due to stable wind is symmetrically unimodal distribution of direction. Although the relative energy distribution of wind wave spectrum due to strong wind is appoximately unimodal, its symmetry is poor. The extremal spectrum density directions of components of wind wave spectrum types are different. This indicates that wave components of different frequencies have different principal directions.