摘要
首次将列率谱分析的方法引入到随机海浪的研究。根据不同环境条件下实验室资料 ,对列率谱与频率谱进行了比较。结果表明 ,列率频对频率谱高频部分有明显改善 ,特别对二倍频含能段的分辨具有明显的优越性。另外 ,列率谱具有计算速度快、简单易行。
Up to now, a large number of sea wave spectra, es pe cially the wind generated sea wave spectra, have been obtained. Several were der ived form the observed wave factors based upon some assumptions, but most were o btained though the correlation function by means of the discrete Fourier transfo rm using wave records. The latter, as the main method to obtain the sea wave spe ctrum, does well in describing the main part of the spectral energy, whereas som e drawbacks exist when dealing with nonlinear random sea wave. In our study, the sequency spectral method for nonlinear random wave is introduced to describe th e high frequency nonlinear effect.\;Experiment were conducted in the wind-wave fume laboratory of Ocean University o f Qingdao. Using two kinds of different wind speeds and two fetches in the wind- wave experiment, and a kind of wave essential factor, a group of slope and an ar ray of wave gauge were also used in the bottom slope experimental arrangement.\;Calculated frequency spectra are compared with the sequency spectra to the basis of different observation data sets. The difference between these two spectra is less significant over the band of the predominant wave energy, but rather signi ficant within higher frequencies, especially near the twice peak frequency. Furt hermore, compared with frequency spectral analysis, the sequency spectrum method has many advantages including faster calculating speed, convenient use and high distinguishability.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2001年第5期547-550,共4页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金资助项目 4 97762 85号
山东省教委资助项目。
