Abstract
Abstract The component waves of a short gravity wave system generated in a linear wind-wave channel at a fetch of 5 m s−1 and air friction velocity of 55 cm s−1 were detected and measured with coherent microwave scattering. Phase speeds were determined from the Doppler shifts. Surface displacements deduced from the Doppler spectra were superposed and compared with independently measured slope spectra. It is concluded that at least 80% of the energy of the short gravity wave system is carried by essentially free waves.
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