REVERBERATION FLUCTUATIONS FROM A SMOOTH SEA-FLOOR

High-frequency shallow-water reverberation statistics were measured fr om a smooth, sandy, featureless seafloor. The reverberation statistics are presented as a function of source frequency (20-180 kHz), grazing angle (30-degrees, 20-degrees, 9.5-degrees) and source beamwidths (1. 2-degrees-2.75-degrees). Generally, the reverberation statistics did n ot follow a Rayleigh fading model. The model dependence of the reverbe ration statistics exhibited a complex behavior that ranged from near G aussian to beyond log-normal. The results show that small changes in t he source frequency, grazing angles, and beamwidths caused large varia tions in the model dependence of the reverberation statistics.