Local properties of wave modulation observed by wavelet analysis

Zhi Cheng Huang, Hweng Hwung

研究成果: 書貢獻/報告類型會議論文篇章同行評審

2 引文 斯高帕斯(Scopus)

摘要

Long-term evolution of a narrow-banded nonlinear wave train is investigated experimentally. The wavelet analysis providing information in both time and frequency domain is employed to examine the local evolutionary characteristics of wave modulation. The zero-crossing method, Hilbert transform and Fourier transform are utilized to compare and validate the results obtained from the wavelet analysis. Results show that the modulated wavetrain resulting from the sideband instability can be represented by the peak frequencies in the wavelet spectrum. The local evolutionary properties of asymmetric amplitude and frequency modulations are found. The local frequency downshift is evidenced to correlate to the wave breaking. It is manifested that the energy of the waves near the front of modulated wave group is originally concentrated near the upper sideband and then is downshifted to the lower sideband after the occurrence of wave breaking and the wave fusion.

原文???core.languages.en_GB???
主出版物標題Proceedings of The Seventeenth 2007 International Offshore and Polar Engineering Conference, ISOPE 2007
頁面2000-2005
頁數6
出版狀態已出版 - 2007
事件17th 2007 International Offshore and Polar Engineering Conference, ISOPE 2007 - Lisbon, Portugal
持續時間: 1 7月 20076 7月 2007

出版系列

名字Proceedings of the International Offshore and Polar Engineering Conference
ISSN(列印)1098-6189
ISSN(電子)1555-1792

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???event.eventtypes.event.conference???17th 2007 International Offshore and Polar Engineering Conference, ISOPE 2007
國家/地區Portugal
城市Lisbon
期間1/07/076/07/07

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