India has an extensive coastline of about 7,517 km. the coastline of Tamil Nadu has a length of 1,076 km, which constitutes about 15 percent of the total coastal length of India, and stretches along the Bay of Bengal, the Indian Ocean, and the Arabian Sea. About 46 rivers drain into the Bay of Bengal forming several estuaries adjoining coastal lagoons. The International Panel on Climate Change (IPCC) considered seawater intrusion into aquifers an important future impact of climate change and sea-level rise. Understanding the evolution of groundwater chemistry, especially the balance between...