SPATIAL DISTRIBUTION AND DIRECTIONALITY OF ACOUSTIC SCATTERING IN ROCKY ENVIRONMENTS
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Authors
Fromm, Amanda R.
Subjects
high frequency
sonar
acoustic
scattering
rock
rocky environment
spatial distribution
directionality
Lambert
Lommel-Seeliger
stationary
isotropic
sonar
acoustic
scattering
rock
rocky environment
spatial distribution
directionality
Lambert
Lommel-Seeliger
stationary
isotropic
Advisors
Olson, Derek
Date of Issue
2020-12
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
The interaction of sound, or an acoustic signal, with the seafloor is an active area of research due to its importance for naval applications in undersea warfare, mine warfare, and special operations, and for remote sensing of seafloor properties for geological and biological research. Seafloor roughness greatly affects acoustic scattering. However, little is known about how much extremely rough seafloors, such as rocky environments, affect the acoustic scattering. Rocky seafloor environments are thought to have extreme spatial variability and increased acoustic scattering compared to sand and mud seafloors. This research analyzed the spatial distribution and directionality of acoustic scattering in rocky environments to determine stationarity and isotropy. Remote sensing software often uses limited historical acoustic data to best fit the scattering parameters in a given environment. The two most common empirical models in remote sensing applications are the Lambert model and the Lommel-Seeliger model. The Lommel-Seeliger (L-S) model proved to be a better fit to this data. The single parameter of the L-S model was used as the proxy to determine whether the scattering strength was stationary or isotropic. The measurements indicated that there was spatial variability and thus non-stationarity to the scattering behavior in both the alongshore and cross-shore directions. Scattering strength was found to be isotropic based on analysis of the survey data as a function of heading.
Type
Thesis
Description
Series/Report No
Department
Oceanography (OC)
Organization
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NPS Report Number
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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.