Some physical models for estimating scattering of underwater sound by algae

Abstract

A theoretical study of scattering of underwater sound waves by algae has been performed. The dependenies of sound level in reflected waves on parameters of algae (sizes, biomass) are determined. To this purpose, the physical models corresponding to typical algae species are developed. Scattering of sound by algae is treated as diffraction of a sound wave on a random system of three-dimensional bent elastic bodies. Sound pressure in the waves scattered by acoustically semitransparent bent plates and rods corresponding to alga leaves and stems is computed. The statistical properties of algae (roughness, inclination) are taken into account. The theoretical estimations are compared with experimental values. The obtained results can be used for the development of the methods of exploration of the continental shelf and also for the assessment algae resources.