Investigation of the generation and propagation of low frequency internal waves: A case study for the east coast of India

SAR (Synthetic Aperture Radar) images in the northwest Bay of Bengal indicate the existence of internal waves and their occurrence and intensity is topography dependent as indicated by in-situ data and satellite information. To complement and comprehend the observations, a three-dimensional Princeto...

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Bibliographic Details
Published in:Estuarine, coastal and shelf science coastal and shelf science, 2010-06, Vol.88 (1), p.143-152
Main Authors: Rao, A.D., Babu, S.V., Prasad, K.V.S.R., Ramana Murty, T.V., Sadhuram, Y., Mahapatra, D.K.
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
bathymetry
Bay of Bengal
Biological and medical sciences
Brackish
Brackish water ecosystems
Coastal
Complement
Freshwater
Fundamental and applied biological sciences. Psychology
Internal waves
Mathematical models
Ocean models
River discharge
stratification
Synecology
Synthetic aperture radar
tides
Wave propagation
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Summary:SAR (Synthetic Aperture Radar) images in the northwest Bay of Bengal indicate the existence of internal waves and their occurrence and intensity is topography dependent as indicated by in-situ data and satellite information. To complement and comprehend the observations, a three-dimensional Princeton Ocean Model is applied to study the generation and propagation of internal waves. The model domain is configured with a variable curvilinear grid and the input fields comprise bathymetry, initial temperature and salinity, wind stress, air-sea heat flux and tidal information. The numerical investigation indicated a predominant activity of internal waves in the north, and the rationale is three-fold. The first one could be the stable stratification due to fresh water discharge from head-bay major river system, secondly, the significant magnitude/range of the tides and finally, the bathymetry in the coastal waters off Paradip is about 12% shallower compared to that of Visakhapatnam and further south. The cumulative effect of these causes the predominance of internal waves in the north. The core of the energy is essentially in the low-frequency range and the model is able to simulate semi-diurnal and diurnal components reasonably well up to 6 h frequency (0.162 cph).
ISSN:0272-7714
1096-0015
DOI:10.1016/j.ecss.2010.03.010