Physicochemical characteristics of water and sediment in Thengapattanam estuary, southwest coastal zone, Tamilnadu, India
2013
Anitha, G. | Kumar, Sugirtha P.
The present study was carried out to determine the physicochemical characteristics of water and sediment in Thengapattanam estuary for the period of one year during October 2010 to September 2012. Atmospheric temperature and surface water temperature varied from 28.3°C to 31.8°C and 26.2 to 29.4°C respectively. Salinity varied from 0.5 ‰ to 11‰. pH remained alkaline throughout the study period in all the stations with maximum value during summer and minimum during post monsoon. Higher dissolved oxygen concentration was observed during monsoon season might be due to the cumulative effect of higher wind energy coupled with heavy rainfall and river inflow. BOD was high during summer season and low during post monsoon season. Concentration of nutrients showed significant spatial and temporal variations and their levels in water increased during rainy season. Sediment characteristics were also studied for one year. The organic carbon of the stations varied from0.061% to 0.522%. Nitrogen content varied from 0.012%to 0.052%. Total phosphorus ranged between 0.03% and 0.09%. Sediment texture ranges in terms of percentage of sand, silt and clay were 85.4% to 96.8%, 1.2% to 11.9% and 1.1% to 8.8% respectively at all the stations.
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