The effect of seabed properties on the receive beam pattern of a hydrophone located on the seafloor.
Multi-path interference is often considered when modelling propagation of underwater sounds from source to receiver. When close to, or on the seabed, a hydrophone receives the direct and bottom reflected signals at nearly identical times. The resulting interference leads to an effective receive beam...
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| Format: | Journal Article |
| Published: |
The Australian Acoustical Society
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/23932 |
| _version_ | 1848751290150027264 |
|---|---|
| author | Parsons, Miles Duncan, Alexander |
| author2 | David J Mee |
| author_facet | David J Mee Parsons, Miles Duncan, Alexander |
| author_sort | Parsons, Miles |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Multi-path interference is often considered when modelling propagation of underwater sounds from source to receiver. When close to, or on the seabed, a hydrophone receives the direct and bottom reflected signals at nearly identical times. The resulting interference leads to an effective receive beam pattern that depends not only on source and receiver position and water depth, but also on the seabed characteristics, which affect the phase and magnitude of the reflection coefficient. Numerical acoustic propagation models account for this phenomenon automatically, however; it is important that it be taken into account when received signals are used to carry out simple calculations of source levels of nearby sources based on spherical spreading. Australian waters lie above seabeds of greatly differing acoustic properties. Compressional and shear sound speeds and absorption properties for four bottom types (basalt, calcarenite, sand and silt) were used to model the effective receive beam pattern of a hydrophone located on the seafloor. Modelling was carried out for all four seabeds as well as a seabed comprising differing thicknesses of sand over a calcarenite half space. The effects of the resulting receive beam pattern on estimations of source levels and locations are discussed. |
| first_indexed | 2025-11-14T07:50:22Z |
| format | Journal Article |
| id | curtin-20.500.11937-23932 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:50:22Z |
| publishDate | 2011 |
| publisher | The Australian Acoustical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-239322023-01-27T05:26:32Z The effect of seabed properties on the receive beam pattern of a hydrophone located on the seafloor. Parsons, Miles Duncan, Alexander David J Mee Ian D M Hillock Multi-path interference is often considered when modelling propagation of underwater sounds from source to receiver. When close to, or on the seabed, a hydrophone receives the direct and bottom reflected signals at nearly identical times. The resulting interference leads to an effective receive beam pattern that depends not only on source and receiver position and water depth, but also on the seabed characteristics, which affect the phase and magnitude of the reflection coefficient. Numerical acoustic propagation models account for this phenomenon automatically, however; it is important that it be taken into account when received signals are used to carry out simple calculations of source levels of nearby sources based on spherical spreading. Australian waters lie above seabeds of greatly differing acoustic properties. Compressional and shear sound speeds and absorption properties for four bottom types (basalt, calcarenite, sand and silt) were used to model the effective receive beam pattern of a hydrophone located on the seafloor. Modelling was carried out for all four seabeds as well as a seabed comprising differing thicknesses of sand over a calcarenite half space. The effects of the resulting receive beam pattern on estimations of source levels and locations are discussed. 2011 Journal Article http://hdl.handle.net/20.500.11937/23932 The Australian Acoustical Society restricted |
| spellingShingle | Parsons, Miles Duncan, Alexander The effect of seabed properties on the receive beam pattern of a hydrophone located on the seafloor. |
| title | The effect of seabed properties on the receive beam pattern of a hydrophone located on the seafloor. |
| title_full | The effect of seabed properties on the receive beam pattern of a hydrophone located on the seafloor. |
| title_fullStr | The effect of seabed properties on the receive beam pattern of a hydrophone located on the seafloor. |
| title_full_unstemmed | The effect of seabed properties on the receive beam pattern of a hydrophone located on the seafloor. |
| title_short | The effect of seabed properties on the receive beam pattern of a hydrophone located on the seafloor. |
| title_sort | effect of seabed properties on the receive beam pattern of a hydrophone located on the seafloor. |
| url | http://hdl.handle.net/20.500.11937/23932 |