PARTI Characteristics of Coastal Waves and Currents CHAPTER 1 On The Characteristics of One-Dimensional Spectra and Non-Dimensional Parameters of Wind Waves

Similarity relationship among non-dimensional significant wave parameters are discussed which is based upon the 3/2 power law. The characteristics of the wind wave spectra in deep water are investigated by using the parameters of JONSWAP spectrum and the 3/2 power law. From theoretical and empirical arguments, it is confirmed that a f " power law exists at high frequency range, that JONSWAP spectrum parameter y and a are varied with fetch, and that parameter a and y satisfied a-1/3 power law. In shallow water region, spectral form of wind waves is varied with the shoaling coefficient. Through the analysis of the wind wave spectra, a new spectral formula is obtained. Relationship between the marine surface wind and wind waves gives us the basic knowledge in field as diverse as air-sea interaction, wave hindcasting and engineering design of maritime structures