Depressions 10-50 cm in diameter and O(10) cm deep were observed in rotary acoustic imagery of the seafloor during SandyDuck97. The rotary sonar record spans a 77 day period and 13 storm events. The depressions occurred during both the wave growth and the wave decay phases of each storm and over a relatively narrow range of wave energies (u rms = 0.32 cm/s ± 0.05 cm/s standard deviation) and grain roughness Shields parameters(=0.7 ± 0.2). The observations are mainly from the outer surf zone in %3 m mean w…
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