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Padmalal, D.
- Submarine Groundwater Discharge in the Indian Context
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1 National Centre for Earth Science Studies, Ministry of Earth Sciences, Akkulam, Thiruvananthapuram 695 011, IN
1 National Centre for Earth Science Studies, Ministry of Earth Sciences, Akkulam, Thiruvananthapuram 695 011, IN
Source
Current Science, Vol 115, No 12 (2018), Pagination: 2197-2198Abstract
In India, the demand for freshwater resources is increasing every year because of population rise and rapid economic development. This warrants the imminent need for better evaluation of all the available sources of freshwater and their discharge–recharge mechanisms for planning sustainable development strategies in the country. Among different sources, groundwater constitutes about 97% of the earth’s liquid freshwater in the hydrologic cycle. It has now been realized that as part of the hydrologic cycle, a significant amount of groundwater flows directly into the sea through porous rocks and sediments1. This component is called submarine groundwater discharge (SGD). In a study carried out in the southern United States using 226Ra as tracer2, it was reported that the contribution of SGD in the coastal waters of the area could be comparable to the observed discharge from rivers3. Although India has an extensive coastline of about 7500 km, except selected case studies4–10, no systematic efforts have hitherto been made to assess SGD flux to its receiving coastal waters. As the country is undergoing rapid economic development in the recent years, it is high time that the scientific community make efforts to estimate the quantity and quality of SGD flux to the Indian seas for planning and development of its freshwater potential.Full Text
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