Hybrid wave-mode modelling and wave kinematics
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abstract
To predict the kinematics of an irregular wave train accurately, it is essential to understand the effects of wave modulation on the elevation and kinematics. The understanding of the wave modulation leads to a more realistic and hence more rational wave model using hybrid wave-mode functions. In a hybrid model for an irregular wave train, long-wavelength waves are described by conventional wave-mode functions and short-wavelength waves by modulated wave-mode functions which describe the modulation of the short-wavelength waves directly and explicitly. A simple hybrid wave model is used to decompose a dual component wave and compute the kinematics under its crests and troughs. The satisfactory comparison between the numerical and experimental results indicates that a hybrid wave model can be extended to simulate an irregular wave train and lead to a more accurate prediction of the wave kinematics.
