Freshwater-Saline Water Interface

The freshwater-saline water interface is the boundary between freshwater, like rain or river water, and salty seawater in coastal areas or underground aquifers. Because freshwater is less dense than salty water, it tends to flow above the denser saltwater, creating a distinct layered system. This interface’s position depends on factors like groundwater flow, tides, and human activities. Understanding this interface is important for managing water resources, preventing saltwater intrusion into freshwater supplies, and protecting ecosystems. Essentially, it’s the moving line where fresh and salty waters meet and interact underground or along coastlines.