Abstract
There exist bound gravity-capillary waves that move at the speed of dominate waves on the ocean surface, besides free gravity-capillary waves that satisfy the dispersion relation. The radar Doppler spectra are believed to be the sum of two parts: one is attributed to free waves, and the other is attributed to bound waves. The experiments on microwave backscatter from ocean surface in the wind-wave tank are reported in this paper. The occurrence of bound waves can well explain the asymmetry of Doppler spectra between upwind and downwind.
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