Abstract
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 ) ( per t , velocity ) ( vel C , wavelength ) (L and wave numbers ) (k are found to be 2.133 hrs – 34.72 hrs, 0.135 km hr -1 , 0.37 km - 6.2 km and 2.70 - 0.16 cycles km -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 ( 34 . 3 0 = E J m -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 modeling. The loss in the acoustic transmission is found to be 38.4 dB in the presence of Low frequency IW field.
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