Resolving Bellhop Issues: Negative Range Arrivals and Volume Attenuation
Date
2025
Authors
Fang, C.T.C.
Zander, A.
Hassan, E.
Franklin, S.
Robertson, W.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Conference paper
Citation
Proceedings of Acoustics 2025: Sounds of the Sunset Coast: Annual Conference of the Australian Acoustical Society, 2025, pp.1-10
Statement of Responsibility
Chung T C Fang, Anthony C Zander, Eyad R Hassan, Stephen Franklin, and William S P Robertson
Conference Name
Acoustics: Sounds of the Sunset Coast (12 Nov 2025 - 14 Nov 2025 : Joondalup, Western Australia)
Abstract
Bellhop is a widely used underwater acoustic ray-tracing model, but its 1990s Fortran core imposes legacy constraints including half-space simulations and single-frequency absorption. We identify and correct a key numerical issue in the ArrMod.f90 module that prevented negative-range propagation, enabling single-run full-space simulations without separate half space runs. In addition, we extended Bellhop's single frequency ab-sorption to broadband application by post processing along individual ray trajectories at lower computational cost. Validation against analytical solution shows agreement in both positive and negative ranges and accurate frequency-dependent attenuation. These improvements simplify Bellhop workflows and provide a more general-ised volume attenuation solution.
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Dissertation Note
Provenance
Description
Conference Session 8.3 Underwater Acoustics 2
ISBN is from USB key containing proceedings (9780909882112)
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Copyright ©2025 Australian Acoustical Society. The Proceedings of Acoustics 2025 Sounds of the Sunset Coast have been reproduced from author-submitted files. The authors are solely responsible for the technical content and opinions expressed therein. The opinions expressed are not necessarily those of the Australian Acoustical Society. Permission is hereby granted for any person to reproduce a fractional part of any paper herein provided that permission is obtained from its author(s) and credit is given to the author(s) and these proceedings. An author or their research sponsor may reproduce the paper in full crediting these proceedings. This permission is not assignable.