风浪内频谱与外频谱的比较分析

概述了近年来不同水深风浪谱研究的发展状况，引入内频谱及外频谱的概念，介绍了风浪谱的几种估计方法；快速傅里叶变换（FFT）法，最大熵法和外频谱法，根据不同水深的风浪槽试验，将由FFT法、最大熵法得到的内频谱与由试验波高-波周期联合分布得到的外频谱进行比较分析，将现场实测风浪谱与计算得到的外频谱进行比较分析，结果表明，在不同水深情况下，当以真实的波高-波周期联合分布计算外频谱时，内频谱与外频谱吻合良好。

Comparative Analysis of Wind Wave Inner Spectrum and Apparent Spectrum

The development history of wind wave spectrum for different water depths is outlined,and the concepts of apparent spectrum and inner spectrum are introduced,Three spectral evaluation methods are presented,that is,the FFT method.the maximum entropy principle(MEP)method,and the apparent spectral method.According to wind wave channel experiments with different water depths,the inner spectrum from the FFT method and the MEP method is compared with the apparent spectrum from the wave height wave period joint distribution.The field measured spectrum is compared with the apparent spectrum.Analysis indicates that the inner spectrum and the apparent spcctrum fit well when the real wave height wave period joint distribution is applied to the evaluation of the apparent spectrum.