SHALLOW-WATER BOTTOM REVERBERATION MEASUREMENTS

High-frequency bottom reverberation measurements were made at an exper imental site in the Gulf of Mexico. The acoustic data were taken as a function of frequency (40-180 kHz) and grazing angle (4 degrees-33 deg rees). The measured acoustic reverberation results are compared to pre dictions made by models developed by Jackson et al. and Boyle and Chot iros. The models used inputs from the analysis of sediment cores and s tereo photography. The model predictions show differences from each ot her and from the data. The results show reverberation-level variabilit ies as a function of frequency that cannot be accurately predicted by these models.