Underwater acoustic backscatter from a model of Arctic ice open leads and pressure ridges
By: Michael Joseph Browne
Contributors: Naval Postgraduate School (U.S.)
Publisher: Naval Postgraduate School
Published: 1987
Place of publication: Monterey, California
Language: eng
Format: [electronic resource] /
Number of pages: 159
Subjects: Underwater acoustics; Diffraction
Description: Behavior of monostatic backscatter from Arctic open leads and pressure ridges was studied using scale models in the laboratory under controlled conditions. Experiments were performed in an anechoic tank using pulsed transmissions from underwater point sources to measure the backscatter from several different floating acrylic plate by the selection of the acrylic material, and the geometrical properties of the ice in features were accurately scaled by maintaining the appropriate dimension-to-wavelength ratios. The characteristic behavior of the backscatter was explained using both diffraction theory and mode-conversion concepts. It was generally observed that a significant amount of the incident acoustic energy resulted in solidborne vibrations and propagating waves within the floating plate. The ability of those vibrations to reradiate energy into the water resulted in greater backscatter than predicted from the trailing edge of an open lead and piston-like radiation from pressure rigid models.
Notes: Thesis Advisor(s): Medwin, Herman.

Second Reader: Bourke, Robert H.

"June 1987."

Description based on title screen as viewed on March 16, 2010.

DTIC Identifier(s): Mode conversion.

Author(s) subject terms: Underwater Acoustics, Arctic Ice, Backscatter, Mode Conversion, Diffraction.

Thesis (M.S. in Engineering Acoustics)--Naval Postgraduate School, June 1987.

Includes bibliographical references (p. 156-157).

"Approved for public release, distribution unlimited"--Cover.

Also available in print.

Mode of access: World Wide Web.

System requirements: Adobe Acrobat Reader.