Record Details

Modeling of wind induced ambient noise vertical directionality and its variation due to bottom characteristics in shallow Arabian Sea

NOPR - NISCAIR Online Periodicals Repository

View Archive Info
 
 
Field Value
 
Title Modeling of wind induced ambient noise vertical directionality and its variation due to bottom characteristics in shallow Arabian Sea
 
Creator Najeem, S.
Latha, G.
Raguraman, G.
 
Subject Ambient noise
Shallow water
Vertical directionality
 
Description 135-139
In
underwater acoustics, knowledge regarding vertical structure of ambient noise
has got lot of interest since it improves the design and performance of sonar
systems. In this work the influence of ocean environment on wind induced
vertical directionality of ambient noise has been analyzed using a model based
on ray theory. Shallow water site off the Cochin coast at 30 m depth in Arabian
Sea was chosen for studying the characteristics of vertical directionality.
Variation of vertical directionality with respect to frequency, Sound speed
profile and sediment properties were analyzed and the result clearly shows the
importance of those environmental factors on directionality. Vertical
directionality of summer and winter sound speed profiles was almost similar
except for the broadside, where the effect of noise notch is prominent. Based
on the difference in bottom reflectivity significant variation in intensity was
observed for different sediment compositions. Variation of directionality with
frequency clearly indicates the limitation of ray theory at low frequency.
Finally the simulated directionality at different frequencies were compared with
field measurements and the model results fits relatively well with the field
data.
 
Date 2016-07-04T06:54:33Z
2016-07-04T06:54:33Z
2015-02
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/34618
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.44(02) [February 2015]