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Impact of internal waves on the acoustic field at a coastal station off Paradeep, east coast of India

DRS at CSIR-National Institute of Oceanography

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Title Impact of internal waves on the acoustic field at a coastal station off Paradeep, east coast of India
 
Creator Sridevi, B.
Murty, T.V.R.
Sadhuram, Y.
Murty, V.S.N.
 
Subject Internal waves
Garrett-Munk model
Acoustic modelling
Ray paths
 
Description Internal Wave (IW) characteristics and the impact of IW on acoustic field have been studied utilizing the hourly time series of temperature and salinity data collected at a coastal site off Paradeep (north Bay of Bengal) during 24-25 October 2008. The IW characteristics, viz. period (t sub (per)), velocity (C sub (vel)), wavelength (L), and wave numbers (k), are found to be 2.133-34.72 h, 0.135 km h sup (-1), 0.37-6.2 km and 2.70-0.16 cycles km sup (-1), respectively. The semi-diurnal tidal forces are predominant than diurnal as well as at other frequencies and its contribution is about 64% towards the total potential energy (E 0 = 3.34 J sup (-2)). Sound velocity perturbations with space and time in the presence of IW field are examined from Garrettt-Munk (GM) model. Transmission loss anomaly for optimized source-receiver configuration at the depth of 53 m and range of 9 km has been computed from acoustic modelling. The loss in the acoustic transmission is found to be 38.4 dB in the presence of low-frequency IW field.
 
Date 2011-06-16T05:22:26Z
2011-06-16T05:22:26Z
2011
 
Type Journal Article
 
Identifier Natural Hazards, vol.57(3); 2011; 563-576
http://drs.nio.org/drs/handle/2264/3863
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2011] Springer.
 
Publisher Springer