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Nature of the observed oscillatory flows in shelf waters of the western continental shelf of India

DRS at CSIR-National Institute of Oceanography

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Title Nature of the observed oscillatory flows in shelf waters of the western continental shelf of India
 
Creator Shenoi, S.S.C.
Antony, M.K.
Sundar, D.
 
Subject Oceanography and Limnology
coastal waters
baroclinic mode
barotropic mode
internal waves
shelf currents
continental shelves
oscillatory flow
ISW, India
 
Description Time series data on currents obtained from three Aanderaa current meters moored at a station depth of 92 m in the waters of the western continental shelf of India during May 1984 indicated the presence of oscillatory flows. The spectral computations revealed maximum in the semidiurnal frequency band with its magnitude higher by one order compared to that of the other bands. An analysis of phase differences together with coherence of flows at different levels and their amplitudes showed dominance of internal waves with frequencies close to semidiurnal period (internal tide) controlling the flow structure. The temperature records at these levels together with the B.T. time series data collected in the vicinity of mooring site supported the presence of internal waves. Semidiurnal characteristics computed from hydrographic data collected during the period of mooring across the shelf combined with the distribution of phases and amplitudes of horizontal velocities are found to be consistent with the generation of internal tides along the slope region. The barotropic and baroclinic nature of these currents separated and decomposed by averaging the data from all sensors and using empirical orthogonal functions respectively revealed the dominance of the former in the longshore component and the latter in the cross-shore component
 
Date 1995-06-21T10:01:39Z
2017-09-30T01:29:48Z
1995-06-21T10:01:39Z
2017-09-30T01:29:48Z
1988
 
Type Journal Article
 
Identifier Journal of Coastal Research, vol.4; 1988; 617-626
0749-0208
http://drs.nio.org/drs/handle/2264/7058
 
Language en
 
Relation J Coastal Res
SCI
 
Publisher Tirunelveli: JCSONLINE