海浪方向谱估计方法的比较

Comparisons on estimating method of directional spectrum

分别利用数值模拟和实测资料对目前被认为分辨力较高的最大似然法（MLM）、扩展本征矢方法（EEV）、扩展最大滴方法（EMEP）以及贝叶斯方法（BDM）等四种海浪方向谱估计方法的可靠性进行了分析，从不同频率、不同噪声水平和不同方向集中度三个角度检验其再现性、稳定性和实用性，结果表明MLM、EEV和BDM大致给出相同的方向分布，其中BDM的再现性最好，但实用性逊于MLM和EEV，EMEP由于稳定性差，不适用于实测资料的分析．

Based on numerical simulation and observation data, the four estimating methods of directional spectrum, maximumlikelihood method (MLM), extended eigenvector method (EEV), extended maximum-entropy principle (EMEP) and Bayesian directional method (BDM) are studied about their reliabilities respectively. It is shown that MLM, EEV and BDM basically give thesame directional distribution in general. However, BDM holds the best reproducibility in any cases, and is inferior to MLM andEEV in practicality. EMEP is not suitable to real observation data because of its Poor stability.