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Radiation and attenuation of waves in a random mediumThe physical mechanisms of excess attenuation are analyzed on the basis of a one-dimensional time-independent model of propagation in a random medium. Attenuation is regarded as the rate of decrease in the mean intensity and the mean energy flux within a propagation range. A source function is assumed to be determinate, appropriate statistical properties are chosen for the sound speed, and specified statistical properties are found for the wave functions, i.e., the mean intensity and the mean energy flux. The medium is considered to be weakly homogeneous, and expansions are developed for the intensity and mean energy flux, along with an attenuation coefficient in two parts, the second of which defines the excess attenuation. The mean radiated power is defined, and backscattering by the random inhomogeneities in the medium is modeled as redistributing the mean intensity and energy flux, with a resultant decay which occurs more quickly than with randomness.
Document ID
19820036518
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Wenzel, A. R.
(U.S. Navy, Naval Ocean Research and Development Activity, Bay St. Louis MS, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Publication Information
Publication: Acoustical Society of America
Subject Category
Acoustics
Accession Number
82A20053
Funding Number(s)
CONTRACT_GRANT: NAS1-14472
CONTRACT_GRANT: NAS1-14101
Distribution Limits
Public
Copyright
Other

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