Analysis of Wave Characteristics in Extreme Seas
DAVID TAYLOR RESEARCH CENTER BETHESDA MD
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Results from three studies concerning identification and characterization of extreme waves in storm driven seaways are presented. Methods and results using time-series wave height data from hurricane Camille are illustrated. Task 1 demonstrated the utility of the half-cycle matrix HAYCM method in analyzing nonlinear time-series data. Task 2 involved wave making experiments where the Camille nonlinear wave spectrum was replicated. Task 3 using second order wave-wave interaction theory, provided a nonlinear time domain wave height model conforming to the Camille nonlinear wave spectrum. In Task 1, the HAYCM analysis of input and output realizations from Dalzells nonlinear simulation model showed that this analysis method provides a clear indication of the nonlinearity of a time series random variable. In Task 2, the nonlinearity of waves generated in two different towing tanks approached that of the original Camille seaway when the wave spectrum was approximated by mechanically generated waves. In Task 3, while numerically modeled hurricane Camille time series showed somewhat less nonlinearity than the original time series data, the flattening of wave troughs and elevations of crests due to nonlinear wave-wave interaction was realistic.
- Physical and Dynamic Oceanography
- Numerical Mathematics
- Fluid Mechanics