Abstract
Measurements made with a fixed-bottomed source and fixed-bottomed receivers in water 2400 f deep show that for small ocean wave heights, up to about 3 ft, the fluctuations in amplitude of surface-reflected sine-wave signals at frequencies of 400, 750, 1000, and 1500 Hz at grazing angles of 18°, 31°, and 85° are in general agreement with theoretical predictions. In this wave height range, the coefficient of variation increased with increasing frequency, grazing angle, and wave height, reaching a maximum at about 5-ft wave height for each combination of frequency and grazing angle. As the wave height increased further, up to 30 ft, the coefficient for a given combination of frequency and grazing angle generally decreased. For a given combination of frequency and grazing angle, the average peak level of the reflected pulses does not appear to depend strongly upon wave height.
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