Accession Number:

ADA227128

Title:

A Model of the Acoustic Interactions Occurring Under Arctic Ice

Descriptive Note:

Final rept. 1989-1990

Corporate Author:

NAVAL ACADEMY ANNAPOLIS MD

Personal Author(s):

Report Date:

1990-05-22

Pagination or Media Count:

109.0

Abstract:

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.

Subject Categories:

  • Snow, Ice and Permafrost
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE