SPECTRAL MEASUREMENTS AND GROWTH RATES OF WIND-GENERATED WATER WAVES.
STANFORD UNIV CALIF DEPT OF CIVIL ENGINEERING
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Power spectral density measurements were made of the water surface displacement in a wind-generated wave train in the Stanford Wind, Water-wave Facility. Two of the more interesting features of the measured spectra--the presence of a second peak and the lack of an equilibrium range--are fully discussed. Growth rates of different wave components were determined from the measured spectra. The resulting values were compared with those predicted by the viscous Reynolds stress mechanism of energy transfer from wind to wave which was proposed by Miles. Where the growth was exponential the theory could be made to predict growth rates successfully at wave numbers less than 15.0 ft-1. At higher wave numbers the theory predicted values an order of magnitude larger than those measured in the Stanford facility. Limited regions of linear growth were found at the lowest wind speed for low frequency components. The scatter in the data did not permit a quantitative comparison with theory to be made for this range. Author
- Test Facilities, Equipment and Methods
- Fluid Mechanics