Wave statics
description
Transcript of Wave statics
Wave staticsChang Hsien Kuo
102328
NRCESTReference2
methods3
Significant wave representation 4
Individual wave H1>H2>H3
Brestchneider (1968)H1/3:1/3 (significant wave, )T1/3:Neir et al. (2003)T1/3:T1>T2>T31/3Statistical properties5
Rayleigh distributionRepresentative wave height6
Representative wave height7
Statistical theory for irregular waves8
Rayleigh distribution for wave height9
Rayleigh distribution for wave height10
Rayleigh distribution for wave height11
Rayleigh distribution for wave height12
1/Nth Waves for Rayleigh distribution13
1/Nth Waves for Rayleigh distribution14
1/Nth Waves for Rayleigh distribution15
1/Nth Waves for other distributions16
Regular wave17
Irregular wave18
Frequency spectrum of irregular waves19
Fourier transform (Fast FT)
Frequency spectrum of irregular waves20
Brestchneider (1968)
Goda (1988)
Wallops spectrum by Hwung et al . (1981)
Frequency spectra of irregular waves21JONSWAP (1973)
Directional Spectrum of sea waves22
G() : directional distribution of energy spectrumS(f) : energy (power) spectrumDirectional Spectra of sea waves23
Mitsuyasu (1975)
Smax: Spreading parameterDirectional Spectra of sea waves24
Smax=20
Relationship between spectra and wave height25
Zeroth moment of spectrum
Relationship between spectra and wave height26
Relationship between spectra and wave period27
Zeroth and second moments of spectrum
Spectra of sea waves-Example I28
Example I29
Directional spectrumExample-I30
sample average of sixteen directional spectradirectional spectra of in-site buoy measurementsExample-I31
directional spreading function
Power spectrumExample-II32
Example-II33
Example-II34