Science / Tides and Currents / Estuary: An embayment of the coast in which fresh river water entering at its head mixes with the relatively saline ocean water. When tidal action is the dominant mixing agent it is usually termed a tidal estuary. Also, the lower reaches and mouth of a river emptying directly into the sea where tidal mixing takes place. The latter is sometimes called a river estuary.
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Seasonal Estuary

Science / Marine Biology / Seasonal Estuary: An estuary in which salinity at any one geographic point changes seasonally (e.g., decreases during the spring melt) MORE

Vertically Homogeneous Estuary

Science / Marine Biology / Vertically Homogeneous Estuary: An estuary in which, at any given location, wind or tidal mixing homogenizes salinity throughout the water column MORE

National Estuary Program

Business / Agriculture / National Estuary Program: A program established under the Clean Water Act Amendments of 1987 to develop and implement conservation and management plans for protecting estuaries and restoring and maintaining their chemical, phy MORE