Propagation Loss Modelling on the Scotian Shelf: The Geo-Acoustic Model

Abstract

A model of the acoustic environment of the ocean bottom sediments has been prepared for a selected area on the Scotian Shelf where both summer and winter propagation loss data have been collected. This geo-acoustic model is part of the input to a shallow water propagation loss model described in the accompanying paper, “Propagation Loss Modelling on the Scotian Shelf: Comparison of Model Predictions with Measurements”. An attempt has been made to provide an independent bottom model, based on geophysical evidence, including continuous records from a high-resolution seismic profiling system, seismic refraction experiments, grab samples, and consultation with marine geologists familiar with the area. The final criterion for acceptance of the model parameters is the agreement between propagation loss model predictions and experimental measurements for both summer and winter conditions.