Analysis of wave groups by wave envelope-phase and the Hilbert Huang transform methods
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- 作者：Albena Veltcheva ; C. Guedes Soares ; c.guedes.soares@centec.tecnico.ulisboa.pt" class="auth_mail" title="E-mail the corresponding author
- 关键词：Wave groups ; Hilbert-Huang Transform ; Abnormal waves ; Instantaneous frequency ; Instantaneous energy ; Frequency modulation
- 刊名：Applied Ocean Research
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：60
- 期：Complete
- 页码：176-184
- 全文大小：3203 K
文摘
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The group structure of records, containing abnormal waves, is studied by the non-stationary HHT method.
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The envelope, phase and frequency, define the local wave instantaneous characteristics.
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A refined definition of wave group is proposed considering that waves are amplitude and phase modulated.
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The Hilbert spectrum is used as a detector of wave groups and group length and energy are determined.
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It was found that the symmetrical abnormal waves appear in records with pronounced groupiness.