Nearshore Airborne Lidar Observations
Final rept. 19 Aug 1999-31 Mar 2001
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Hwang et al. 1999a and 1999b uses standard FFT procedures to estimate deep water 2-dimensional wavenumber spectra from lidar images. The characteristic wavelength analyzed is O100m, homogeneity scale is O10km and wave evolution scale is O100km. Knowledge of the local bathymetry allows, via the linear dispersion relation is needed for retrieving frequency-directional spectrum. The classical Fourier transform approach FT fails in the nearshore region due to the strong spatial inhomogeneities of the wavefield, generated by lower order wave-bathymetry and quadratic wave-wave interaction. Shoaling waves evolve much faster than deep-water waves, over O1km scales Elgar and Guza, 1985. Other approaches, such as wavelet transforms, have been ocasionally used in ocean wave data analysis. The method is. relatively new and its physical interpretation has yet to be set on a solid basis.
- Physical and Dynamic Oceanography
- Numerical Mathematics
- Optical Detection and Detectors