Underwater acoustic backscatter from a model of Arctic ice open leads and pressure ridges
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Authors
Browne, Michael Joseph
Subjects
Underwater Acoustics
Arctic Ice
Backscatter
Mode Conversion
Diffraction
Arctic Ice
Backscatter
Mode Conversion
Diffraction
Advisors
Medwin, Herman
Date of Issue
1987-06
Date
Publisher
Monterey, California: U.S. Naval Postgraduate School
Language
en_US
Abstract
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
Type
Thesis
Description
Series/Report No
Department
Engineering Acoustics
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
159 p. 28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
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.