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Computation of Broadband Sound Signal Propagation in a Shallow Water Environment with Sinusoidal Bottom using a 3-D PE Model

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In this paper, numerical results of sound propagation in a three-dimensional oceanic waveguide with a sinusoidal (corrugated) bottom are reported. A broadband sound pulse with a center frequency of 25 Hz and a bandwith of 30 Hz is considered. This acoustic problem was previously studied by Collins and Chin-Bing considering a harmonic point source [J. Acoust. Soc. Am. 87(3), 1104-1109 (1990)]. The numerical method used to solve the 4-D acoustic problem is based on a Fourier synthesis of frequency-domain solutions. The calculations in 3-D are carried out using the fully 3-D parabolic equation based model 3DWAPE. To analyze the acoustic problem, we follow closely the methodology used in previous works to investigate the 3-D ASA wedge and 3-D Gaussian canyon benchmarks [F. Sturm, J. Acoust. Soc. Am., 117(3), 1058-1079 (2005)]. Results corresponding to a 25 Hz continuous wave point source are first presented and compared with predictions by another model. Then, the acoustic problem is solved considering the broadband source pulse. The modal structure of the received signals on several distinct vertical arrays is analyzed and clearly exhibits mode arrivals of the propagating signal not predicted by pseudo-3-D or 2-D PE models.
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Document Type: Research Article

Publication date: November 1, 2007

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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