Development of a labolatory facility for the measurement of sound propagation in shallow water environment
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Authors
Pongsitanont, Nakorn
Subjects
Advisors
Sanders, J.V.
Coopens, A.B.
Date of Issue
1989-12
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The propagation of sound in a laboratory-modeled, shallow water environment consisting of water overlying a thick layer of water-saturated sand was experimentally investigated. A hydrophone consisting of a small lead-titanate lead-zirconate cylinder was used as a receiver. A 304x117x95 cm fiberglass-encased wooden tank with a 10 cm layer of water overlying a 45 cm layer of water-saturated sand was used in this experiment. The receiver sensitivity and directionality were determined for frequencies from 10 kHz to 100 kHz. The ration of the speed of sound in the water-sand to that in water was 1.2 and the ratio of the densities was 2.05. The measured normal-incidence pressure reflection coefficient was within 12.8% of the predicted value. The measurements of pressure amplitude in the water as a function of depth were found to be in good agreement with normal mode theory for the first mode, but slight unexplained differences were observed for the sum of the first and second modes. The apparatus developed for this
thesis has been shown to accurately model sound propagation
in shallow water with a flat sandy bottom and is now available for the study of more complicated bottom
topographies.
Type
Thesis
Description
Series/Report No
Department
Engineering Acoustics
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
74 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner.