Low-frequency sound interaction with a sloping, refracting ocean bottom

The effects of refracting sediments on low-frequency sound propagation in range-dependent oceans are studied with parabolic equation models. The predictions of three sediment sound-speed models for low-frequency propagation are compared. Two factors that result in sediment sound-speed gradients are...

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Bibliographic Details
Published in:IEEE journal of oceanic engineering 1988-10, Vol.13 (4), p.235-244
Main Authors: Collins, M.D., Ali, H.B., Authement, M.J., Nagl, A., Uberall, H., Miller, J.F., Arvelo, J.I.
Format: Article
Language:English
Subjects:
Acoustic materials
Acoustic propagation
Acoustic refraction
Attenuation
Equations
Oceans
Predictive models
Sediments
Thermodynamics
Time domain analysis
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Summary:The effects of refracting sediments on low-frequency sound propagation in range-dependent oceans are studied with parabolic equation models. The predictions of three sediment sound-speed models for low-frequency propagation are compared. Two factors that result in sediment sound-speed gradients are considered. Variation in static pressure due to the variation in the weight of overlying material causes sediment sound speed to increase with depth. The thermodynamic influence of the ocean results in large sound-speed gradients in a boundary layer in the uppermost layer of the sediment. The associated affects of attenuation on propagation are also considered. Both time-domain and frequency-domain results are presented.< >
ISSN:0364-9059
1558-1691
DOI:10.1109/48.9236