Sensitivity of shallow water transmission loss to source and receiver proximity to a hard bottom under downward refracting conditions

Abstract

Under downward refracting conditions, raypafth fromi a shallow source will tend to have grazing angles at a hard bottom that are greater than the critical angle and. therefore, suffer a relatively large loss per bounce. As the source depth Increases, lower grazing angles can be obtained. When the grazing angle becomes less than the critical angle, bottom loss per bounce Is significantly reduced. allowing a possible reduction In propagation loss. analysis Is made for a North Atlantic shallow water area south of Long Island under summer conditions to detenrine the sensivty of transmission loss to changes in source and recelver depth for ranges up to 50 kmn. The results are compared to the previous results of Cole and Podeszwa [B. F.

Archives of Acoustics

“…Different source and receiver positions can result in various acoustic transmission effects. The sensibility of transmission loss (TL) with varying source and receiver depths in a shallow sea during the summer was investigated by Herstein, the results of which were compared with the results of an investigation by Cole (Herstein et al, 2006;Cole, Podeszwa, 1967). The latter utilized a ray model and the experimental data of a shallow water to study the TL of downward refraction.…”