Time-series analysis of offshore-wind-wave groupiness
This research is to applies basic time-series-analysis techniques on the complex envelope function where the study of the offshore-wind-wave groupiness is a relevant interest. In constructing the complex envelope function, a phase-unwrapping technique is integrated into the algorithm for estimating the carrier frequency and preserving the phase information for further studies. The Gaussian random wave model forms the basis of the wave-group statistics by the envelope-amplitude crossings. Good agreement between the theory and the analysis of field records is found. Other linear models, such as the individual-waves approach and the energy approach, are compared to the envelope approach by analyzing the same set of records. It is found that the character of the filter used in each approach dominates the wave-group statistics. Analyses indicate that the deep offshore wind waves are weakly nonlinear and the Gaussian random assumption remains appropriate for describing the sea state. Wave groups statistics derived from the Gaussian random wave model thus become applicable.
- Research Organization:
- California Univ., Berkeley, CA (USA)
- OSTI ID:
- 7039688
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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16 TIDAL AND WAVE POWER
GAUSSIAN PROCESSES
OFFSHORE SITES
WAVE FORCES
WIND LOADS
WATER WAVES
NONLINEAR PROBLEMS
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DYNAMIC LOADS
GRAVITY WAVES
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