New Bottom Roughness Calculation from Multibeam Echo Sounders for Mine Warfare
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Authors
Earls, Patrick J.
Subjects
Mine Warfare
Bottom Roughness
EM710 Multibeam Echo Sounder
Bathymetry
Backscattering.
Bottom Roughness
EM710 Multibeam Echo Sounder
Bathymetry
Backscattering.
Advisors
Chu, Peter C.
Date of Issue
2012-09
Date
Sep-12
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
Bottom roughness has a significant effect on acoustic backscattering on the ocean bottom. Sonar systems rely on backscattering and shadows for detecting objects lying on the seafloor. The seafloor is rather complex including craters, gullies, seaweed, rocks, sand ridges, tall obstructions, deep holes and sloping regions. Underwater mines can be hidden around these objects to make detection more difficult. High resolution (1 m 1 m) seafloor data collected by the Navy using multibeam echo sounder (EM710) off the western coast of Saipan was processed by the MB Systems. The advanced least-square method is used to establish new bottom reference level from the EM710 data. After removing the reference level, the high-resolution bathymetry data converts into bottom roughness percentage using a threshold. The calculated bottom roughness percentage is ready to be incorporated into the current Navy doctrine. Two new (gradient and mathematical morphology) methods have been developed in this thesis to calculate the bottom roughness without the reference level. Statistical analysis was conducted to illustrate the added value of the new bottom roughness calculation.
Type
Thesis
Description
Series/Report No
Department
Physical Oceanography
Organization
Identifiers
NPS Report Number
Sponsors
Funding
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.