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Title: Water quality status of Cochin estuary, India
Authors: Thasneem, T.A.
Nandan, S. Bijoy
Geetha, P.N.
Keywords: Cochin estuary;Water quality;Nutrients;Dissolved Oxygen
Issue Date: May-2018
Publisher: NISCAIR-CSIR, India
Abstract: In the present study the water quality of the Cochin estuary was monitored from June 2009 to May 2011. The depth of the Cochin estuary was found to be reduced. Range of water temperature showed an increasing trend. Salinity of the estuary showed oligo-mesohaline nature. TDS established a strong positive correlation significant at 1% level between river discharge and conductivity. Higher oxygen concentration during post-monsoon period was due to the higher primary production occurring in the surface layers during this period. Elevated levels of CO2 and pH shifting to alkaline side indicate ecosystem stress. Organic pollution and nutrient enrichment in the Cochin estuary is attributed to the high BOD values (>5mg L-1). Average concentration of ammonia-N2 increased. The heavy rainfall and the increased surface runoff during the monsoon attributed to the high values of silicate in the surface waters during monsoon period. In the Cochin estuary the season wise, zone wise and year wise analysis of Redfield ratio showed a nitrogen limiting condition.
Page(s): 978-989
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.47(05) [May 2018]

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