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Influence of Saltwater Barrage on Tides, Salinity, and Chlorophyll a in Cochin Estuary, India

DRS at CSIR-National Institute of Oceanography

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Title Influence of Saltwater Barrage on Tides, Salinity, and Chlorophyll a in Cochin Estuary, India
 
Creator Shivaprasad, A.
Vinita, J.
Revichandran, C.
Manoj, N.T.
Srinivas, K.
Reny, P.D.
Ashwini, R.
Muraleedharan, K.R.
 
Subject Estuaries
Saline water
Tidal amplitude
Salinity effects
 
Description Thanneermukkam Barrage (TB) is constructed in the southern arm of Cochin estuary. It prevents salt intrusion upstream and regulates river discharge downstream. Characteristics of the estuary when the barrage is opened and closed are discussed. The analysis showed that the closure of the barrage caused amplification of tides in the immediate vicinity and up to 10 km farther downstream. When the barrage was closed, the northern region of the TB transformed from an ebb-dominant system into a flood-dominant system. During high discharge periods, the barrage was opened and salinity intrusion was exponentially dependent on river discharge. During the dry period, the reduction in river flow compounded with closure of the barrage resulted in an increased salinity concentration downstream. Whereas oceanic salinity was observed at the ocean-end station, about 13PSU occurred at the river-end station when the barrage was closed. Hydrodynamic control on phytoplankton biomass was also evident. Higher surface chlorophyll a levels were observed at higher salinity during the closed barrage period, and residence time was estimated for 4 days during this period.
 
Date 2014-01-13T08:57:38Z
2014-01-13T08:57:38Z
2013
 
Type Journal Article
 
Identifier Journal of Coastal Research, vol.29(6); 2013; 1382-1390
http://drs.nio.org/drs/handle/2264/4432
 
Language en
 
Rights Copyright [2013]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Coastal Education and Reserch Foundation