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Stability of vertical coherence of ambient noise in shallow waters off the Indian coast

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Title Stability of vertical coherence of ambient noise in shallow waters off the Indian coast
 
Creator Sanjana, M.C.
Latha, G.
Nithyanandam, K.
 
Subject Ambient noise
Field measurements
Vertical coherence
 
Description 140-143
Ambient noise field in shallow waters is very complicated due to wave guide
nature of the environment and multiple reflections between the sea surface and
the sea bottom. Vertical coherence for high sea state is estimated for
different coastal sites with dissimilar sound speed profiles, and the effect of
wind forcings on coherence pattern is addressed here. Time averaged coherence
for wind generated noise is a relatively stable feature and is independent of
the temporal variations in the ocean environment.  This has been demonstrated using estimates
spread over a period of time for wind forcings above 4 beau fort. Coherence for
sandy site (off Cuddalore) with reflective seabed is mostly positive, due to
noise field that is fairly symmetric around the horizontal whereas for silty
site (off Cochin), the absorbing seabed gives rise to an asymmetric field. Off
Vizag, the upward refracting sound speed profile that leads to a surface duct
makes coherence more symmetric than the other sites.
 
Date 2016-07-04T07:00:30Z
2016-07-04T07:00:30Z
2015-02
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/34620
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.44(02) [February 2015]