ACOUSTIC ATTENUATION IN SEA ICE (PART I); REFLECTION OF SOUND AT THE WATER-ICE INTERFACE (PART II).
Measurements of the attenuation of acoustic waves in sea ice at frequencies between 10 kHz and 500 kHz were made on the ice cover at Tanquary Fiord, Ellesmere Island (latitude 81 degrees 25 min N, longitude 76 degrees 50 min W) during April-May in 1967 and again in 1969. A horizontal transmission pa...
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ftdtic:AD0707059 2023-05-15T15:08:58+02:00 ACOUSTIC ATTENUATION IN SEA ICE (PART I); REFLECTION OF SOUND AT THE WATER-ICE INTERFACE (PART II). Langleben,M. P. Pounder,E. R. MCGILL UNIV MONTREAL (QUEBEC) MACDONALD PHYSICS LAB 1970-05 text/html http://www.dtic.mil/docs/citations/AD0707059 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0707059 en eng http://www.dtic.mil/docs/citations/AD0707059 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost Acoustics (*SEA ICE SOUND TRANSMISSION) (*SOUND TRANSMISSION ATTENUATION) REFLECTION INTERFACES HIGH FREQUENCY SURFACES PIEZOELECTRIC TRANSDUCERS SALINITY UNDERWATER SOUND ARCTIC REGIONS CANADA ELLESMERE ISLAND ANGLE OF INCIDENCE TANQUARY FIORD Text 1970 ftdtic 2016-02-18T23:22:32Z Measurements of the attenuation of acoustic waves in sea ice at frequencies between 10 kHz and 500 kHz were made on the ice cover at Tanquary Fiord, Ellesmere Island (latitude 81 degrees 25 min N, longitude 76 degrees 50 min W) during April-May in 1967 and again in 1969. A horizontal transmission path at a depth of 4 ft, mid-way between the top and bottom surfaces of the ice cover, was used at ranges of 4 ft to 25 ft between piezoelectric transducers immersed in oil-filled bore holes. In an auxiliary experiment in 1969, measurements of the specular reflection of water-borne sound at the water-sea ice interface were made as a function of angle of incidence. The geometric configuration was such that a constant path aligned carefully at each angle of incidence to match this configuration thus obviating the necessity of having to make corrections for range and for directionality characteristics of the transducers. The amplitude reflection coefficient was found to have a value near 0.1 for near-normal angles of incidence but its value was found to increase rapidly with increasing angle of incidence beyond 30 degrees. (Author) Text Arctic Ellesmere Island Ice permafrost Sea ice Tanquary Fiord Defense Technical Information Center: DTIC Technical Reports database Arctic Canada Ellesmere Island Tanquary Fiord ENVELOPE(-79.747,-79.747,81.085,81.085) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Snow Ice and Permafrost Acoustics (*SEA ICE SOUND TRANSMISSION) (*SOUND TRANSMISSION ATTENUATION) REFLECTION INTERFACES HIGH FREQUENCY SURFACES PIEZOELECTRIC TRANSDUCERS SALINITY UNDERWATER SOUND ARCTIC REGIONS CANADA ELLESMERE ISLAND ANGLE OF INCIDENCE TANQUARY FIORD |
spellingShingle |
Snow Ice and Permafrost Acoustics (*SEA ICE SOUND TRANSMISSION) (*SOUND TRANSMISSION ATTENUATION) REFLECTION INTERFACES HIGH FREQUENCY SURFACES PIEZOELECTRIC TRANSDUCERS SALINITY UNDERWATER SOUND ARCTIC REGIONS CANADA ELLESMERE ISLAND ANGLE OF INCIDENCE TANQUARY FIORD Langleben,M. P. Pounder,E. R. ACOUSTIC ATTENUATION IN SEA ICE (PART I); REFLECTION OF SOUND AT THE WATER-ICE INTERFACE (PART II). |
topic_facet |
Snow Ice and Permafrost Acoustics (*SEA ICE SOUND TRANSMISSION) (*SOUND TRANSMISSION ATTENUATION) REFLECTION INTERFACES HIGH FREQUENCY SURFACES PIEZOELECTRIC TRANSDUCERS SALINITY UNDERWATER SOUND ARCTIC REGIONS CANADA ELLESMERE ISLAND ANGLE OF INCIDENCE TANQUARY FIORD |
description |
Measurements of the attenuation of acoustic waves in sea ice at frequencies between 10 kHz and 500 kHz were made on the ice cover at Tanquary Fiord, Ellesmere Island (latitude 81 degrees 25 min N, longitude 76 degrees 50 min W) during April-May in 1967 and again in 1969. A horizontal transmission path at a depth of 4 ft, mid-way between the top and bottom surfaces of the ice cover, was used at ranges of 4 ft to 25 ft between piezoelectric transducers immersed in oil-filled bore holes. In an auxiliary experiment in 1969, measurements of the specular reflection of water-borne sound at the water-sea ice interface were made as a function of angle of incidence. The geometric configuration was such that a constant path aligned carefully at each angle of incidence to match this configuration thus obviating the necessity of having to make corrections for range and for directionality characteristics of the transducers. The amplitude reflection coefficient was found to have a value near 0.1 for near-normal angles of incidence but its value was found to increase rapidly with increasing angle of incidence beyond 30 degrees. (Author) |
author2 |
MCGILL UNIV MONTREAL (QUEBEC) MACDONALD PHYSICS LAB |
format |
Text |
author |
Langleben,M. P. Pounder,E. R. |
author_facet |
Langleben,M. P. Pounder,E. R. |
author_sort |
Langleben,M. P. |
title |
ACOUSTIC ATTENUATION IN SEA ICE (PART I); REFLECTION OF SOUND AT THE WATER-ICE INTERFACE (PART II). |
title_short |
ACOUSTIC ATTENUATION IN SEA ICE (PART I); REFLECTION OF SOUND AT THE WATER-ICE INTERFACE (PART II). |
title_full |
ACOUSTIC ATTENUATION IN SEA ICE (PART I); REFLECTION OF SOUND AT THE WATER-ICE INTERFACE (PART II). |
title_fullStr |
ACOUSTIC ATTENUATION IN SEA ICE (PART I); REFLECTION OF SOUND AT THE WATER-ICE INTERFACE (PART II). |
title_full_unstemmed |
ACOUSTIC ATTENUATION IN SEA ICE (PART I); REFLECTION OF SOUND AT THE WATER-ICE INTERFACE (PART II). |
title_sort |
acoustic attenuation in sea ice (part i); reflection of sound at the water-ice interface (part ii). |
publishDate |
1970 |
url |
http://www.dtic.mil/docs/citations/AD0707059 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0707059 |
long_lat |
ENVELOPE(-79.747,-79.747,81.085,81.085) |
geographic |
Arctic Canada Ellesmere Island Tanquary Fiord |
geographic_facet |
Arctic Canada Ellesmere Island Tanquary Fiord |
genre |
Arctic Ellesmere Island Ice permafrost Sea ice Tanquary Fiord |
genre_facet |
Arctic Ellesmere Island Ice permafrost Sea ice Tanquary Fiord |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/AD0707059 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766340229471404032 |