Generation and evolution features of L2-type crescent waves in laboratory conditions

A series of experiments on generation and evolution of L2-type crescent waves are performed. The examined influencing factors includes the effects of different experimental setups, competition of class I and class II instabilities and the effects of finite water depth and wave steepness. The most un...

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Bibliographic Details
Published in:Ocean engineering 2015-07, Vol.102, p.51-62
Main Authors: Yan, K., Zou, Z.L., Zhou, Y.L.
Format: Article
Language:English
Subjects:
Amplitude spectrum
Crescent
Crescent waves
Critical wave steepness
Evolution
Instability
Marine
Mathematical analysis
Ocean engineering
Perturbation wave
Stability
Steepness
Wave generation
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Summary:A series of experiments on generation and evolution of L2-type crescent waves are performed. The examined influencing factors includes the effects of different experimental setups, competition of class I and class II instabilities and the effects of finite water depth and wave steepness. The most unstable perturbation waves are introduced as a laboratory experiment technique of crescent wave generation. The measured critical wave steepness for triggering crescent waves is obtained and compared with theoretical results. The evolution features of L2-type crescent wave and Benjamin–Feir instability are discussed. •A series of experiments on L2-type crescent waves are performed.•The observed and theoretical crescent wave steepnesses are obtained.•The effects of finite water depth and wave steepness are investigated.•The competition of class I and class II instabilities is discussed.•The evolution features of L2-type crescent wave are presented.
ISSN:0029-8018
1873-5258
DOI:10.1016/j.oceaneng.2015.04.034