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Acoustic propagation affected by environmental parameters in coastal waters

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Title Acoustic propagation affected by environmental parameters in coastal waters
 
Creator Sanjana, M C
Latha, G
Thirunavukkarasu, A
Raguraman, G
 
Subject Acoustic propagation
Sound speed profile
Transmission loss
Shallow water
 
Description 17-21
In coastal regions various factors affect
the propagation of acoustic signals such as wind, tidal effects, off shore currents
and even river outflows. Shallow water waveguide is also characterised by
site-specific source nature, bathymetry, sediment properties and sound speed
profile. Monterey-Miami Parabolic Equation (MMPE) model has been used to study
the propagation in very shallow waters of Arabian Sea
with respect to environmental parameters. Sound speed Profiles (SSP) and bottom
sediment samples measured at the site characterize the water column and the
ocean bottom respectively. Bottom is clay (soft bottom) which can lead to
absorption of acoustic intensity into the sediment leading to a decrease in
reflected acoustic rays. Under these conditions propagation to large distances
will be associated with

large losses in acoustic energy. Critical
angle of propagation determined theoretically is found to be ±11.42o
with respect to horizontal representing low order trapped modes. SSP is
downward refracting enhancing propagation along the bottom. In this paper
Transmission Loss (TL) computation have been carried out for different
frequencies with respect to range and depth. Signal loss and arrival structure
and the travel time have been computed for different ranges from 0 to 6 km.
Model results have been evaluated by comparing with field measurements and are
found to be suitable for modelling extremely shallow water environments.
 
Date 2014-02-05T09:20:46Z
2014-02-05T09:20:46Z
2014-01
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/26420
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(1) [January 2014]