Theoretical seminar | 18 December 2024

Mode parabolic equations for broadband shallow water acoustic modelling are considered. Following the Split-step Pade method the high-order Pade approximation is applied to the pseudo-differential exponent operator resulting in a wide angle mode parabolic equation capable of accurately handling propagation angles up to nearly ±90 degrees relative to the main propagation direction. Fully discrete transparent boundary conditions and perfectly matched layers are considered for the artificial truncation of the computation area. A ray-based starter is introduced to provide adequate initial conditions for the wide angle parabolic equation. The numerical scheme is implemented in a newly developed open-source program AMPLE capable of modeling broadband sound propagation in complex three-dimensional waveguides. The numerical scheme and program are validated against other numerical methods on several modal problems. Three-dimensional modelling of underwater noise produced by a bulk carrier vessel and estimation of sound exposure due to seismic pulses is performed using the developed program.

Main paper/arXiv, related to the seminar, and other references, up to 5

https://doi.org/10.1121/10.0026238
https://doi.org/10.1016/j.jsv.2020.115526
https://doi.org/10.3390/jmse10010082
https://doi.org/10.1121/10.0034424
https://doi.org/10.1134/S1063771023600316