Joe Warren

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Andrej Dujella

University of Zagreb

Hemin Koyi

Uppsala University

Jana Javornik

University of East London

Armando Marques-Guedes

UNL - New University of Lisbon

Graham Martin

University of Leicester

Gwen Robbins Schug

University of North Carolina at Greensboro

Gabriel Gutierrez-Alonso

University of Salamanca

John Sutton

Macquarie University

Eros Carvalho

Universidade Federal do Rio Grande do Sul

Kevin Arbuckle

Swansea University

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Papers by Joe Warren

Estimating the scattering contribution from microstructure and marine organisms using multiple-frequency acoustic data collected from a Gulf of Maine internal wave

The Journal of the Acoustical Society of America, 2000

High-frequency sound (>10 kHz) is scattered in the ocean by many different sources. Marine org... more High-frequency sound (>10 kHz) is scattered in the ocean by many different sources. Marine organisms are often thought to be the primary source of backscattered sound energy. Because of this, acoustical methods are used widely to quickly survey large areas of the ocean for the distribution and abundance of animals. Field experiments and recent theoretical work suggest that temperature and salinity microstructure in some oceanic regions could cause acoustic scattering at levels comparable to that caused by organisms. A method which uses multiple-frequency acoustic data to discriminate between biological and physical sources of scattering has been developed and applied to data collected in an internal wave in the Gulf of Maine. Model calculations show that in certain regions, scattering contributions from turbulence are equal to the contributions from animals. Using net tow information to account for the scattering from biological sources, acoustic scattering data combined with tem...

Acoustic scattering by benthic and planktonic shelled animals

The Journal of the Acoustical Society of America, 2000

Acoustic backscattering measurements and associated scattering modeling were recently conducted o... more Acoustic backscattering measurements and associated scattering modeling were recently conducted on a type of benthic shelled animal that has a spiral form of shell (Littorina littorea). Benthic and planktonic shelled animals with this shape occur on the seafloor and in the water column, respectively, and can be a significant source of acoustic scattering in the ocean. Modeling of the scattering properties allows reverberation predictions to be made for sonar performance predictions as well as for detection and classification of animals for biological and ecological applications. The studies involved measurements over the frequency range 24 kHz to 1 MHz and all angles of orientation in as small as 1° increments. This substantial data set is quite revealing of the physics of the acoustic scattering by these complex shelled bodies and served as a basis for the modeling. Specifically, the resonance structure of the scattering was strongly dependent upon angle of orientation and could be...

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