Title page for etd-0307106-171820


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URN etd-0307106-171820
Author Jun-zhi Liu
Author's Email Address No Public.
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Department Physical Oceanography
Year 2005
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Analysis of coastal freak waves
Date of Defense 2005-01-20
Page Count 44
Keyword
  • freak wave
  • coastal freak wave
  • Abstract Coastal freak waves are dangerous to people, ships and buildings in the coastal zone. Their mechanism thus is a very important issue. In this study, the data of around eight million waves collected by Harbor and Marine Technology Center in Taichung are analyzed. The statistical analysis shows that the occurrence probability of freak wave is lower than Rayleigh’s distribution. The corresponding sea-state parameters show freak waves tend to occur more frequently when the nonlinearity are higher, the wave groupiness are higher, or the FFT spectrum from wave records are more narrow-banded. HHT analysis shows wave superposition and wave nonlinearity are both possible mechanisms. Freak waves propagating from a wave source are also simulated based on the linear dispersion relation. In half of the simulations, the maximum wave height decreases to only 70% of the original value.
    Advisory Committee
  • Yang-Yih Chen - chair
  • Yu-Huai Wang - co-chair
  • Hua Chien - co-chair
  • Guan-Yu Chien - advisor
  • Files
  • etd-0307106-171820.pdf
  • indicate access worldwide
    Date of Submission 2006-03-07

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