Abstract
In backscatter experiments, nonlinear wind-wave effects have been observed in Doppler spectra and azimuthal asymmetry of scattering strength. Both effects have been ascribed to spatial skewness associated with nonlinear steepening of the wavefronts. Bicoherence analysis of wavegauge measurements in a laboratory flume supports this mechanism. However, standard statistical methods reveal only average properties. In a recent paper [N. E. Huang, Nonlinear Water Waves Workshop, Bristol, U. K. (1991)], Huang reported on the use of phase/time analysis of the analytic wave function to obtain additional information on local properties and analyzed wave-buoy data by this method. His results showed evidence of ‘‘wave groups’’ in addition to possible fractal properties, the spectra of the phase fluctuations being consistent with a self-similar process of fractal dimension ≊1.4. Phase/time analysis of the laboratory flume data is reported here with similar results and this appears to support fractal behavior of the ‘‘wave groups.’’ Some of the implications for backscatter are considered.
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