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Geoacoustic model for a shallow water site in the Arabian Sea based on bottom loss measurements

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Title Geoacoustic model for a shallow water site in the Arabian Sea based on bottom loss measurements
 
Creator Radhakrishnan, Sreeram
Padmanabham, M.
 
Subject Bottom reflection loss
Geoacoustic model
Shallow water
Acoustic propagation
 
Description 172-182
Results and analysis of bottom reflection loss
measurements made at a shallow water site in the Arabian Sea off Kochi are
presented as a function of frequency (2-12 kHz) and seabed grazing angle (110–340).
Measurements are interpreted as estimates of the modulus of the plane wave
reflection coefficient. First, the bottom reflection loss derived from a
homogeneous fluid half-space model is compared with measured results. It is
observed that the half-space model fails to provide accurate results for higher
grazing angles especially at higher frequencies.
Fine-scale sediment layering is considered to be the cause of frequency and
grazing angle dependence and for improved modeling, a sediment layer overlying
a half-space is used. The best-fit geoacoustic model is obtained by
fitting the model to bottom loss data in the least-square sense. Bottom loss
based on the best-fit geoacoustic model agrees well with the measured data over
the entire frequency range.
 
Date 2016-07-04T08:23:48Z
2016-07-04T08:23:48Z
2015-02
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/34628
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.44(02) [February 2015]