Low-Frequency Acoustic Propagation Modelling for Australian Range-Independent Environments
Large portions of the Australian continental shelf have a seabed composed of layered cemented or semi-cemented calcarenite. This work investigates the ability of a wavenumber integration sound propagation model, two normal mode sound propagation models, and a parabolic equation sound propagation mod...
| Main Authors: | , , |
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| Format: | Journal Article |
| Published: |
Australian Acoustical Society
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/59750 |
| _version_ | 1848760549996756992 |
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| author | Gavrilov, Alexander Koessler, M. Duncan, A. |
| author_facet | Gavrilov, Alexander Koessler, M. Duncan, A. |
| author_sort | Gavrilov, Alexander |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Large portions of the Australian continental shelf have a seabed composed of layered cemented or semi-cemented calcarenite. This work investigates the ability of a wavenumber integration sound propagation model, two normal mode sound propagation models, and a parabolic equation sound propagation model to consistently predict the acoustic field over four types of calcarenite style seabeds. The four geoacoustic models that are presented here represent seabed types that are likely to be found in the Australian marine environment. Transmission loss results for each geoacoustic model are computed using each sound propagation model, which are compared over a broad band of low frequencies in order to assess their relative performance. The performance of the wavenumber integration model, SCOOTER, and the two normal mode models over a broad band of low frequencies was found to be accurate and robust for all the tested scenarios. However, for one of the normal mode models, KRAKENC, long computational runtimes were incurred to produce accurate results. The parabolic equation model RAMSGeo produced accurate transmission loss results at some of the frequencies, but it also produced some unrealistic transmission loss predictions when thin layers were present in the seabed. The normal mode model ORCA was found to have the best balance between accuracy and efficiency because it had the shortest runtimes for most of the calculation frequencies and the shortest overall runtime. |
| first_indexed | 2025-11-14T10:17:33Z |
| format | Journal Article |
| id | curtin-20.500.11937-59750 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:17:33Z |
| publishDate | 2017 |
| publisher | Australian Acoustical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-597502018-07-10T01:22:19Z Low-Frequency Acoustic Propagation Modelling for Australian Range-Independent Environments Gavrilov, Alexander Koessler, M. Duncan, A. Large portions of the Australian continental shelf have a seabed composed of layered cemented or semi-cemented calcarenite. This work investigates the ability of a wavenumber integration sound propagation model, two normal mode sound propagation models, and a parabolic equation sound propagation model to consistently predict the acoustic field over four types of calcarenite style seabeds. The four geoacoustic models that are presented here represent seabed types that are likely to be found in the Australian marine environment. Transmission loss results for each geoacoustic model are computed using each sound propagation model, which are compared over a broad band of low frequencies in order to assess their relative performance. The performance of the wavenumber integration model, SCOOTER, and the two normal mode models over a broad band of low frequencies was found to be accurate and robust for all the tested scenarios. However, for one of the normal mode models, KRAKENC, long computational runtimes were incurred to produce accurate results. The parabolic equation model RAMSGeo produced accurate transmission loss results at some of the frequencies, but it also produced some unrealistic transmission loss predictions when thin layers were present in the seabed. The normal mode model ORCA was found to have the best balance between accuracy and efficiency because it had the shortest runtimes for most of the calculation frequencies and the shortest overall runtime. 2017 Journal Article http://hdl.handle.net/20.500.11937/59750 10.1007/s40857-017-0108-5 Australian Acoustical Society restricted |
| spellingShingle | Gavrilov, Alexander Koessler, M. Duncan, A. Low-Frequency Acoustic Propagation Modelling for Australian Range-Independent Environments |
| title | Low-Frequency Acoustic Propagation Modelling for Australian Range-Independent Environments |
| title_full | Low-Frequency Acoustic Propagation Modelling for Australian Range-Independent Environments |
| title_fullStr | Low-Frequency Acoustic Propagation Modelling for Australian Range-Independent Environments |
| title_full_unstemmed | Low-Frequency Acoustic Propagation Modelling for Australian Range-Independent Environments |
| title_short | Low-Frequency Acoustic Propagation Modelling for Australian Range-Independent Environments |
| title_sort | low-frequency acoustic propagation modelling for australian range-independent environments |
| url | http://hdl.handle.net/20.500.11937/59750 |