Fourier Image Synthesis and Slope Spectrum Analysis of Deepwater, Windwave Scenes Viewed at Brewster's Angle.

摘要

A semi-empirical model for the Fourier synthesis of deepwater, wind-wave scenes has been constructed for the analysis of water-wave slope spectra. The main simplifying assumptions of this model are 1) fully-developed wind-wave surfaces are quasi-homogeneous, quasi-stationary and are therefore treatable by Fourier methods, 2) the subsurface is both optically and mechanically deep, and 3) the small range of spectral wave components defines a fetch-limited, small-amplitude condition. A nonlinear transformation of wave slope to reflected and refracted radiance in both horizontal and vertical polarizations was effected under the special conditions of Brewster-angle viewing under clear skies at a spectral wavelength of 460 nanometers. The synthetic wave scenes were analyzed via the forward Fourier transformation and their radiance magnitude spectra were compared with the original slope magnitude spectra of the initial synthesis in order to estimate the effects of the nonlinear radiance transformation on the recovery of the wave slope spectrum from imagery. Theses. (jhd)