Seafloor manipulative experiments during sediment acoustics experiments (SAX99 and SAX04

Abstract

Seafloor manipulations were performed during Sediment Acoustics Experiments (SAX99 and SAX04) in an attempt to test predictions of high-frequency acoustic backscattering models in sandy environments. Manipulations included alteration of seafloor roughness by raking to mimic the effects of sand ripples on acoustic scattering and placement of marbles, aluminum disks, and shells on the seafloor at different densities to mimic the effects of shelled animals and sand dollars on acoustic scattering (discrete surface scattering). In general, the predictions from scattering models and measured acoustic backscatter strengths were in agreement and the experimental results provide insight into natural phenomena. [Work supported by ONR.]