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- James Alan Tencate, Thomas G. Muir, +5 authors E. Michelozzi
- 1995
The problem of locating very low frequency sound sources in shallow water is made difficult by the interaction of propagating acoustic waves with the sea floor. It is known that low frequency sound… (More)
The acoustic transmitting capacity of a medium is limited by nonlinear propagation effects. As the source amplitude is increased to very high levels, acoustic saturation sets in, a state in which the… (More)
A statistical analysis, based directly on ensemble averages, is made of reverberation data obtained from the wind‐driven surface of a fresh water lake. To produce the reverberation, two types of… (More)
The construction and validation of sample ensembles of reverberation have been considered in Pt. I. These data have been generated by insonifying the rough moving surface of a fresh water lake by… (More)
In October 2002 the Office of Naval Research (ONR) sponsored a Convocation that reviewed the ocean acoustic studies done from 1967 to 1992 under the U.S. Navy’s Long Range Acoustic Propagation… (More)
- David P. Knobles, John A. Goff, Robert A. Koch, Preston S. Wilson, Jack A. Shooter
- IEEE Journal of Oceanic Engineering
- 2010
In this paper, the effects of range inhomogeneities in the seabed layering on low-frequency broadband sound propagation in a shallow-water ocean environment are examined. Acoustic measurements… (More)
This study examines the estimation of seabed geoacoustic parameters in a deep‐water environment using acoustic data generated from the noise of a moving surface ship. The received sound field was… (More)
Abstract : Ship signatures in the form of 1/10 octave band time series and narrowband spectra (0.15 Hz resolution) over the frequency range 10 to 500 Hz are presented. These signatures, detected on a… (More)
Experimental measurements of the directivity patterns of an underwater sound projector operating at a frequency of 38 kHz were made with a hydrophone in the water and with a microphone in air above… (More)
Abstract : The report describes a study, made at Lake Travis, Texas, of seiches generated by atmospheric disturbances. Two simple geometrical models are used to calculate the periods of the first few… (More)