Search Results - "Chapman, D M F"

A simple shallow water propagation model including shear wave effects by ELLIS, D. D, CHAPMAN, D. M. F

“…The Pekeris model has proved to be very useful in describing some features of acoustic propagation in shallow water, and as a simple test of ideas in normal…”
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The group velocity of normal modes by CHAPMAN, D. M. F, ELLIS, D. D

“…A simple, general formula for normal mode group velocities provides an intuitive grasp of the factors influencing group velocity, especially for shallow water…”
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Measurement and modeling of seabed particle motion using buried vector sensors by Osler, J C, Chapman, D M F, Hines, P C, Dooley, G P, Lyons, A P

“…A technique was developed to measure the speed of sound in marine sediments at discrete frequencies from 0.6 to 3 kHz by transmitting pulses from acoustic…”
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The directional nature of attenuation of sound due to scattering at a rough ocean surface by Chapman, D. M. F.

“…The coherent component of sound propagating in a shallow water acoustic environment suffers attenuation with range due to the irreversible scattering of energy…”
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Quantifying the interaction of an ocean bottom seismometer with the seabed by Osler, John C., Chapman, David M. F.

“…A theory is presented for the coupling between an ocean bottom seismometer (OBS), the sediments upon which it rests, and the surrounding water. Assuming that…”
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A coherent ray model of plane-wave reflection from a thin sediment layer by CHAPMAN, N. R, CHAPMAN, D. M. F

“…Plane-wave reflection from a thin, elastic-solid sediment layer over a hard basement is modeled by a simple model that coherently combines rays from only two…”
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The normal-mode theory of air-to-water sound transmission in the ocean by CHAPMAN, D. M. F, WARD, P. D

“…The normal-mode theory is presented for the transmission of sound from a stationary source in a homogeneous, stationary, air layer into an arbitrarily…”
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Modeling air-to-water sound transmission using standad numerical codes of underwater acoustics by CHAPMAN, D. M. F, THOMSON, D. J, ELLIS, D. D

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An improved Kirchhoff formula for scattering loss at low grazing angles by Chapman, D. M. F.

“…The plane wave reflection loss due to scattering at rough ocean surface is calculated using a boundary perturbation method involving an integration over the…”
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Underwatera acoustic ambient noise levels on the eastern Canadian continental shelf by ZAKARAUSKAS, P, CHAPMAN, D. M. F, STAAL, P. R

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The effective depth of a Pekeris ocean waveguide, including shear wave effects by CHAPMAN, D. M. F, WARD, P. D, ELLIS, D. D

“…Weston’s [J. Acoust. Soc. Am. 32, 647–654 (1960)] concept of the effective depth of a Pekeris-type shallow water waveguide has been extended to admit seabeds…”
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A simple shallow water propagation model including shear wave effects by Ellis, Dale D., Chapman, D. M. F.

“…The Perkeris model has proved to be very useful in describing some features of acoustic propagation in shallow water, and as a simple test of ideas in normal…”
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A simple estimate of propagation loss fluctuations due to modal interference by CHAPMAN, D. M. F

“…A simple estimate of propagation loss fluctuations due to deterministic modal interference has been devised for use with normal mode computer codes. It is…”
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An improved Kirchhoff formula for reflection loss at a rough ocean surface at low grazing angles by Chapman, D. M. F.

“…The calculation of specular reflection loss at a rough ocean surface is a time-consuming procedure if the boundary perturbation or mode-coupling methods are…”
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Geoacoustic models for propagation modeling in shallow water by Chapman, D. M. F., Ellis, Dale D.

“…Acoustic propagation in shallow water is viewed as a guided-wave phenomenon, with the sea surface and seabed forming the boundaries. At subkilohertz…”
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