A Model of the Acoustic Interactions Occurring Under Arctic Ice

Underwater sound interacting with the Arctic ice cover is reflected from the plane surface as well as scattered due to small-scale roughness elements and large pressure-ridge keel structures. Experiments modeled the acoustic ice interactions using burst transmissions from omnidirectional underwater...

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Bibliographic Details
Main Author: Ullman, II, Roger R.
Other Authors: NAVAL ACADEMY ANNAPOLIS MD
Format: Text
Language:English
Published: 1990
Subjects:
Snow
Ice and Permafrost
Acoustics
*SURFACE ROUGHNESS
*OCEAN MODELS
*UNDERICE
*ACOUSTIC SCATTERING
SURFACES
PLATES
GEOMETRY
COVERINGS
UNDERWATER ACOUSTICS
UNDERWATER SOUND
UNDERWATER
ACOUSTIC IMPEDANCE
ARCTIC REGIONS
FLOATING BODIES
OMNIDIRECTIONAL
FORWARD SCATTERING
PLANE GEOMETRY
BURST TRANSMISSION
ACRYLIC RESINS
PHYSICAL PROPERTIES
INTERACTIONS
SOURCES
RATIOS
Arctic
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA227128
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA227128
Description
Summary:Underwater sound interacting with the Arctic ice cover is reflected from the plane surface as well as scattered due to small-scale roughness elements and large pressure-ridge keel structures. Experiments modeled the acoustic ice interactions using burst transmissions from omnidirectional underwater point sources. Floating acrylic plates were employed to represent the Arctic ice due to similarity in impedance characteristics and other physical properties to known ice values. Geometrical properties of the ice were accurately scaled in the acrylic by maintaining the appropriate wavelength ratios. Reflection and forward scatter effects were analyzed and compared with existing theories for the Arctic.

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