Submarine groundwater discharge (SGD) reportedly influences the global coastal environment significantly and Indian coast is not an exception. There are strong evidences to the fact that many land derived contaminants like carbon, nutrients, organics, metals and pathogens affect chemical and biological processes of near shore region, wherever SGD occurs. Further, the intensity of mixing and exchange increases depending on the residence time available during recirculation of SGD. Thermal infrared images allow us to monitor physico-chemical changes in land-ocean interface as well as to spatially map the submarine groundwater discharges, particularly through unconfined aquifers. This study attempts to identify and compute the total volume of SGD across selected sites in SW coast and also investigate the intensity of mixing using different parameters like temperature, salinity and radon in groundwater and pore water. There are reports that salinity reduction and excess nutrients induce eutrophication, mudbanks and algal blooms. On quantification of freshwater discharges in such anomalous zones, optimum pumping of groundwater from respective coastal aquifer layers can be advocated. Also release of nutrients and other pollutants through freshwater discharge can be monitored using sensor-based permanent piezometers, as management options.
Role of Submarine Groundwater Discharge in Coastal Aquifer Management
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Submarine groundwater discharge (SGD) reportedly influences the global coastal environment significantly and Indian coast is not an exception. There are strong evidences to the fact that many land derived contaminants like carbon, nutrients, organics, metals and pathogens affect chemical and biological processes of near shore region, wherever SGD occurs. Further, the intensity of mixing and exchange increases depending on the residence time available during recirculation of SGD. Thermal infrared images allow us to monitor physico-chemical changes in land-ocean interface as well as to spatially map the submarine groundwater discharges, particularly through unconfined aquifers. This study attempts to identify and compute the total volume of SGD across selected sites in SW coast and also investigate the intensity of mixing using different parameters like temperature, salinity and radon in groundwater and pore water. There are reports that salinity reduction and excess nutrients induce eutrophication, mudbanks and algal blooms. On quantification of freshwater discharges in such anomalous zones, optimum pumping of groundwater from respective coastal aquifer layers can be advocated. Also release of nutrients and other pollutants through freshwater discharge can be monitored using sensor-based permanent piezometers, as management options.
Publication Mode |
Online |
---|---|
Publication Author |
Murugan Ramasamy, Remya R., Reji Srinivas, D. S. Suresh Babu |
Publication Language |
English |
Publication Type |
Conference Paper |
Publication Year |
2021 |
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