Underwater acoustic scatter from a model of the Arctic ice canopy
When low frequency underwater sound interacts with the Arctic ice cover, not only will it be reflected from the plane and scattered in all directions from roughness elements, but it will also be diffracted at leads and reradiated from flexural waves in the ice. These phenomena have been studied in a...
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ftnavalpschool:oai:calhoun.nps.edu:10945/22164 2024-06-09T07:43:19+00:00 Underwater acoustic scatter from a model of the Arctic ice canopy Denny, Patrick L Johnson, Kevin Robert Medwin, H. Naval Postgraduate school Department of Science and Engineering Bourke, Robert H. 1986 130 p. application/pdf https://hdl.handle.net/10945/22164 en_US eng https://hdl.handle.net/10945/22164 This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. Underwater Acoustics Scatter Backscatter Arctic Ice Reflection Coefficient Flexural Waves Physics Thesis 1986 ftnavalpschool 2024-05-15T00:42:55Z When low frequency underwater sound interacts with the Arctic ice cover, not only will it be reflected from the plane and scattered in all directions from roughness elements, but it will also be diffracted at leads and reradiated from flexural waves in the ice. These phenomena have been studied in an anechoic tank by pulse transmission from an underwater point source to a series of large floating acrylic plate models, each representing a different type of ice cover. The flexural wave speed, the plate and lead dimensions and the acoustic roughness are accurately scaled, and the specific acoustic impedance contrast is approximately modeled by the selection of the acrylic material. The physical contributors to the gross reflection coefficient and backscattering strength are identified and compared for models of a plane ice layer, an Arctic ice pressure ridge, edges of leads, and a rubble field of ice. Approved for public release; distribution is unlimited. Lieutenant Commander, United States Navy Lieutenant, United States Navy http://archive.org/details/underwatercousti1094522164 Thesis Arctic Naval Postgraduate School: Calhoun Arctic |
institution |
Open Polar |
collection |
Naval Postgraduate School: Calhoun |
op_collection_id |
ftnavalpschool |
language |
English |
topic |
Underwater Acoustics Scatter Backscatter Arctic Ice Reflection Coefficient Flexural Waves Physics |
spellingShingle |
Underwater Acoustics Scatter Backscatter Arctic Ice Reflection Coefficient Flexural Waves Physics Denny, Patrick L Johnson, Kevin Robert Underwater acoustic scatter from a model of the Arctic ice canopy |
topic_facet |
Underwater Acoustics Scatter Backscatter Arctic Ice Reflection Coefficient Flexural Waves Physics |
description |
When low frequency underwater sound interacts with the Arctic ice cover, not only will it be reflected from the plane and scattered in all directions from roughness elements, but it will also be diffracted at leads and reradiated from flexural waves in the ice. These phenomena have been studied in an anechoic tank by pulse transmission from an underwater point source to a series of large floating acrylic plate models, each representing a different type of ice cover. The flexural wave speed, the plate and lead dimensions and the acoustic roughness are accurately scaled, and the specific acoustic impedance contrast is approximately modeled by the selection of the acrylic material. The physical contributors to the gross reflection coefficient and backscattering strength are identified and compared for models of a plane ice layer, an Arctic ice pressure ridge, edges of leads, and a rubble field of ice. Approved for public release; distribution is unlimited. Lieutenant Commander, United States Navy Lieutenant, United States Navy http://archive.org/details/underwatercousti1094522164 |
author2 |
Medwin, H. Naval Postgraduate school Department of Science and Engineering Bourke, Robert H. |
format |
Thesis |
author |
Denny, Patrick L Johnson, Kevin Robert |
author_facet |
Denny, Patrick L Johnson, Kevin Robert |
author_sort |
Denny, Patrick L |
title |
Underwater acoustic scatter from a model of the Arctic ice canopy |
title_short |
Underwater acoustic scatter from a model of the Arctic ice canopy |
title_full |
Underwater acoustic scatter from a model of the Arctic ice canopy |
title_fullStr |
Underwater acoustic scatter from a model of the Arctic ice canopy |
title_full_unstemmed |
Underwater acoustic scatter from a model of the Arctic ice canopy |
title_sort |
underwater acoustic scatter from a model of the arctic ice canopy |
publishDate |
1986 |
url |
https://hdl.handle.net/10945/22164 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
https://hdl.handle.net/10945/22164 |
op_rights |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. |
_version_ |
1801372064821542912 |