Journal
ESTUARINE COASTAL AND SHELF SCIENCE
Volume 88, Issue 2, Pages 249-259Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2010.03.020
Keywords
Low frequency; Internal waves; Thermistor chain; GM model; Acoustic simulation; East coast of India
Categories
Funding
- Naval Research Board (NRB), New Delhi, India
- CSIR, New Delhi, India
Ask authors/readers for more resources
Internal waves (IW) are identified off Bhimilipatnam, east coast of India, from the time series CTD (hourly interval) and thermistor chain data (2 min interval) collected during 23-25 Feb 2007. The measurements were carried out at 94 m water depth on the continental shelf edge. These data sets are used to describe the characteristics of IW and their impact on acoustic fields. Garrett and Munk (GM) model has been used to predict the characteristics of low frequency (LF) IW with space and time. Active IW are seen in the layers 54 m-94 m with a velocity of 0.548 km h(-1) and the wavelengths of the order of 0.03 km-21.8 km. The model could capture the IW features in the thermocline region accurately than at the bottom. This could be due to the limitation of the model which considers linearity. High frequency IW observed at the bottom could be due to the advection of tidal currents over the shallow irregular bottom in the presence of stratification. The study emphasizes linear IW rather than transient non-linear waves induced by tidal interaction with topography. Acoustic simulation results for low frequency IW field reveal that the intensity loss anomaly of eigenrays was found to be 2.86 dB-15.59 dB in the water column and maximum (38.48 dB) was observed at the bottom due to the bottom interaction. Our results are well compared with those reported earlier from simulation and acoustic field experiments in the Northern Indian Ocean. (C) 2010 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available