Summary of Abstract Submission

Abstract Submission No. IO50-03-0017PresentationOral

ANTHROPOGENIC IMPACTS ON THE COASTAL WATERS ALONG THE WEST COAST OF INDIA: OBSERVATIONS AND SIMULATIONS.

Renjith VishnuRadhan*1, P Vethamony1

1 National Institute of Oceanography, India

ABSTRACT :

Coastal water quality has direct dynamic relationship with human health as well as aquatic ecosystem functions. The three study regions- Goa, Mumbai and Gulf of Khambhat (GoK) addressed in the study have immense anthropogenic activities. The Mandovi estuary in Goa is found to be comparatively clean irrespective of tourism activities, probably due to the flushing effect of the sea and the high assimilative capacity of the estuary. The prevailing water quality conditions designate Mumbai coastal waters as polluted and are also observed to be reaching near to eutrophic condition. In spite of the teeming population, the water quality modelling (WASP model) of the Mumbai region reveals that the coastal waters can assimilate the waste generated by the present population due to the specific hydrodynamic conditions prevailing in the region. A projected population increase exceeded the target BOD value of 2 mg/L, indicating the deterioration of ambient quality of coastal waters. The data on primary water quality in the GoK show well oxygenated water, rich in nutrients and the simulation shows occasional high values for BOD and NH3. The results indicate major role of rivers in polluting the Gulf as revealed by the simulations. The study delineates Mumbai and GoK as polluted areas considering the effective dominant contaminants, observed water quality index and trophic state index. The methodology used in the study was found effective to other coastal regions having similar environmental settings.