EXPLORATION OF NONTRADITIONAL UNDERSEA DETECTION IN A CHANGING ARCTIC OCEAN
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Authors
George, Elliot R.
Subjects
Arctic Ocean
thermohaline staircases
undersea warfare
acoustic modeling
acoustic detection
thermohaline staircases
undersea warfare
acoustic modeling
acoustic detection
Advisors
Joseph, John E.
Reeder, Davis B.
Date of Issue
2022-03
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
During Navy Ice Exercises (ICEX) in 2018 and 2020, the NPS team collected acoustic data using a dual-headed 38-kHz and 70-kHz echo sounder and a custom-designed ice-coupled acoustic recorder (or cryophone). The echo sounder was used to determine if signals from hydrodynamically disrupted thermohaline staircases could be identified in the water and if present, to observe their reformation. The cryophone collected passive sonar data through the ice generated by a submerged mobile training target up to 10 nautical miles away. Analysis of the signals from ICEX and models generated in Bellhop and Navy Standard Parabolic Equation provided insight that the cryophone shows promise as a useful tool. More work will be required in order to start using the cryophone in the field as intended. The echosounder results are covered in a supplemental document. Both of these concepts offer new possibilities for underwater acoustic data collection in the Arctic, and if development continues, could potentially provide inexpensive acoustic monitoring in this rapidly changing environment.
Type
Thesis
Description
Includes Supplementary Material
Series/Report No
Department
Oceanography (OC)
Organization
Identifiers
NPS Report Number
Sponsors
ONR (Arlington, VA, 22203)
Funding
Format
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.