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Spatial tidal asymmetry of Cochin estuary, West Coast, India

DRS at CSIR-National Institute of Oceanography

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Title Spatial tidal asymmetry of Cochin estuary, West Coast, India
 
Creator Vinita, J.
Shivaprasad, A.
Manoj, N.T.
Revichandran, C.
Naveenkumar, K.R.
Jineesh, V.K.
 
Subject Oceanography and Limnology
Nearshore dynamics
Coastal zone
ISW, India, Cochin Estuary
 
Description An intensive one-month long observational campaign of tides and currents during dry season were used to describe the tidal dynamics and the spatial evolution of tidal asymmetry in Cochin estuary The estuary is described as hyposynchronous since tidal amplitude and currents get attenuated towards upstream through frictional dissipation The results showed that the tidal momentum balance along the main axis of the channel was dominated by pressure gradient and friction The influence of advection was prevalent near the inlets and friction was greatest in the shallow upstream regions Higher harmonics were generated in the estuary through nonlinear friction and advection causing tidal distortions Being a mixed predominantly semidiurnal tidal regime, tidal asymmetry was quantified in terms of sample skewness to examine the spatial evolution in the total asymmetry The principal astronomical tides (M2, K1 and O1) interacted to engender flood dominance at the inlets The compound tides and overtides generated inside the estuary were found to either augment or transform the asymmetry imposed by the principal tides The study showed that friction causes flood dominance at the northern inlet (Munambam) and in the shallow regions of the upstream during dry season In striking contrast, the Cochin inlet and the adjacent harbor area turned to be ebb-dominant These findings have implications for management and sediment transport mechanisms within the estuary.
 
Date 2016-05-12T10:59:20Z
2017-09-30T03:12:37Z
2016-05-12T10:59:20Z
2017-09-30T03:12:37Z
2015
 
Type Journal Article
 
Identifier Journal of Coastal Conservation, vol.19(4); 2015; 537-551
1400-0350
http://drs.nio.org/drs/handle/2264/7674
 
Language en
 
Relation J Coast Conserv
SCI
 
Publisher Springer