2025_programme: Transmission of the explosive sound in the shallow-water wedge and along a flat bottom of the deep ocean
- Day: June 16, Monday
Location / Time: A. TERPSIHORI at 16:10-16:30
- Last minutes changes: -
- Session: 04. Comprehensive Nuclear-Test-Ban Treaty Monitoring, and its Civil and Scientific Applications
Organiser(s): Georgios Haralabus, Mario Zampolli, Tiago Oliveira, Mark Prior
Chairperson(s): Georgios Haralabus, Tiago Oliveira
- Lecture: Transmission of the explosive sound in the shallow-water wedge and along a flat bottom of the deep ocean
Paper ID: 2132
Author(s): Piotr Borejko
Presenter: Piotr Borejko
Abstract: The findings reported in this paper about the two transmission situations referred to in the title are based on an analysis of the propagation of acoustic wave motion from an explosive point source of a wide spectral range placed in the corresponding benchmark models: a wedge of fluid and a half-space of fluid, each of which is over an elastic-solid bottom where the shear-wave velocity is less than the speed of sound in water. In the wedge, source-to-receiver transmission proceeds by repeated reflections; in the half-space, via a single bottom reflection. Using a semi-analytical method of generalized ray, the transmitted (received) wave motion in each model has then been evaluated exactly in the form of an unattenuated acoustical signal of three consecutive phases: the phase of the lateral waves, the phase of the source and the regularly reflected waves, and the phase of the Scholte interface waves. When attenuation in the bottom is accounted for, only low frequencies of the source spectrum can be transmitted over large distances with little attenuation and hence the Scholte-waves phase might dominate at remote receivers. It might then also dominate the transmission through the SOFAR (sound fixing and ranging) channel, upon entering from the shallow-water wedge or the deep ocean.
- Corresponding author: Dr Piotr Borejko
Affiliation: Technische Universität (TU) Wien
Country: Austria
