分析海浪方向谱的扩展本征矢方法 Ⅱ.方法的验证、比较和应用

采用Ｌｏｎｇｕｅｔ－Ｈｉｇｇｉｎｓ形式的方向分布函数作为已知谱，用模拟数据检验了作者是所提出的估计方法ＥＥＶ合理性，并与扩展最大似然方法（ＥＭＬＭ）及Ｌｙｇｒｅ等（１９８６）的最在熵方法（ＭＥＭ）作了比较，在验证和比较中，使用纵摇－横摇浮标，星形阵形和ＣＥＲＣ阵列作为复合阵列，计算表明，ＥＥＶ优于ＥＭＬＭ和ＥＭＥ。最后将ＥＥＶ和ＥＭＬＭ两种方法应用于仪器阵列的外海观测数据，得到了比较合理的海浪方向

AN EXTENDED EIGENVECTOR METHOD FOR ESTIMATION OF DIRECTIONAL SPECTRA OF SEA WAVESII. VERIFICATION, COMPARISON AND APPLICATION OF THE METHOD

In Part I. of the paper, an extended eigenvector method (EEV) for the? estimation of directional spectra of sea waves was derived. The EEV is verifiedand compared with the extension of the maximum likelihood method (EMLM) and the maximum entropy method (MEM) of Lygre et al. by numerical simulations in the present paper. In the numerical simulations, the directional spreading functions of Longuet-Higgins type are employed as input and the existence of noise background in input is considered. Three types of pitch / roll buoy, star and CERC of wave probe array were adopted. The results of the simulations show that the EEV is superior to the EMLM and the MEM, and is especially competent for sea waves with high background noise and narrow angular spread. The EEV and the EMLM methods and 4 probes were used for the estimation of directional spectra from field observation data obtained at an oil platform. The estimated directional spectra are reasonable and reliable.