Lens (hydrology)
CONVEX LAYER OF FRESH GROUNDWATER THAT FLOATS ON TOP OF DENSER SALTWATER
User:Nsaum75/Lens (groundwater); User:Nsaum75/Lens (Hydrology); User:Nsaum75/Lens (hydrology); Lens (groundwater); Freshwater lens; Ghyben-Herzberg lenses; Ghyben–Herzberg lens; Ghyben-Herzberg lens; Ghyben/Herzberg lens; Groundwater lens
In hydrology, a lens, also called freshwater lens or Ghyben-Herzberg lens, is a convex-shaped layer of fresh groundwater that floats above the denser saltwater and is usually found on small coral or limestone islands and atolls. This aquifer of fresh water is recharged through precipitation that infiltrates the top layer of soil and percolates downward until it reaches the saturated zone.