Coastal salinity is emerging as one of the most critical indicators of how climate change, sea-level rise, and human interventions are reshaping our coasts. Coastal aquifers, estuaries, and deltaic systems are under growing pressure from saltwater intrusion, threatening drinking water security, agriculture, and ecosystem health. Designing a robust coastal salinity monitoring network is no longer optional; it is a prerequisite for informed planning, prediction, and policy. Why salinity monitoring matters Salinity controls density-driven circulation, stratification, and mixing in coastal and estuarine waters, which in turn influence sediment transport, nutrient cycling, and habitat suitability for aquatic life. Changes in salinity patterns can signal upstream over-extraction, altered river discharge, storm surges, and sea-level rise long before they become visible crises. Continuous and spatially representative salinity measurements help in early detection of intrusion “fronts,” seasonal...
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