n. (L. aestuarium, part of the seacoast over which the tide ebbs and flows, from aestus, the tide) an inlet or arm of the sea; especially the wide mouth of a river, where the tide meets the current. pl. estuaries.
a bay or inlet, often at the mouth of a river, in which large quantities of freshwater and seawater mix together. These unique habitats are necessary nursery grounds for many marine fishes and shellfishes.
A partially enclosed body of water freely connected to the ocean and within which the seawater of the lower estuary is measurably diluted by mixing with freshwater and in the upper estuary where tidal fluctuations affect river water levels. Within the estuary, species such as salmon can find food, shelter and a seawater/freshwater acclimation holding area.
Regions of interaction between rivers and nearshore ocean waters, where tidal action and river flow create a mixing of fresh water and saltwater. These areas may include bays, mouths of rivers, salt marshes, and lagoons. These brackish water ecosystems shelter and feed marine life, birds, and wildlife.
a) A seaward end or the widened funnel-shaped tidal mouth of a river valley where fresh water comes into contact with seawater and where tidal effects are evident (e.g., a tidal river, or a partially enclosed coastal body of water where the tide meets the current of a stream). b) A portion of an ocean or an arm of the sea affected by fresh water. c) A drowned river mouth formed by the subsidence of land near the coast or by the drowning of the lower portion of a non-glacial valley due to the rise of sea level. Compare – Lagoon. (modified from Jackson, 1997).
Areas of interaction between rivers and nearshore lake waters, where seiche activity and river flow create a mixing of lake and river water. These areas may include bays, mouths of rivers, marshes, and lagoons. These ecosystems shelter and feed fish, birds, and wildlife. Most importantly, Great Lakes estuaries provide habitat for wildlife and for young-of-the-year and juvenile fish.
a semi-enclosed waterbody at the downstream end of a freshwater system, that is subject to marine, freshwater and terrestrial influences, and experiences periodic fluctuations and gradients in salinity
Areas where fresh water from rivers and salt water from near-shore ocean waters are mixed. These areas may include bays, mouths of rivers, salt marshes, and lagoons. These water ecosystems shelter and feed marine life, birds, and wildlife.
the interface where a river meets the sea, where aquatic and marine life meet terrestrial life in marshes and wetlands, and were fresh water still can be influenced by tides. Estuaries can be defined by a salinity gradient that ranges from ocean salinity of 35.0 ppt (parts per thousand) to fresh water with salinity of less than 0.5 ppt.
A confined coastal water body with an open connection to the sea and a measurable quantity of salt in its waters. Estuaries are of particular ecological value and significance because they provide important natural values concerning, for example, fish and wildlife habitat, flood protection, and the maintenance of water quality. The Connecticut River estuary and other Connecticut estuaries contribute to the ecological health of Long Island Sound.
Compare? A complex ecosystem between a river and near-shore ocean waters where fresh and salt water mix. These brackish areas include bays, mouths of rivers, salt marshes, wetlands, and lagoons and are influenced by tides and currents. Estuaries provide valuable habitat for marine animals, birds, and other wildlife.
A semi-enclosed body of water that has a free connection with the open sea and within which seawater (from the ocean) is diluted measurably with freshwater that is derived from land drainage (i.e., from the Connecticut River).
Where the ocean and rivers meet and mix, creating a semi-enclosed body of water that has a free connection with the open sea and within which seawater is diluted measurably with freshwater that is derived from land drainage. Estuaries are very important for fish and shellfish production, especially in providing nursery habitat.
A semi-enclosed coastal body of water which has a free connection with the open sea and where fresh water derived from land drainage (usually mouths of rivers) is mixed with seawater; often subject to tidal action and cyclic fluctuations in salinity.
The region where a river meets the marine environment. It is characterized by variable salinity and often by high biological productivity. eutrophication: Increased primary production caused by the anthropogenic enrichment of a water body with nutrients. (see also primary production and nutrients).
A semienclosed body of water that has a free connection with the open sea and within which seawater (from the ocean) is diluted measurably with freshwater that is derived from land drainage (i.e. the Chesapeake Bay). Brackish estuarine waters are decreasingly salty in the upstream direction and vice versa. The ocean tides are projected upstream to the fall lines.
A semi-enclosed coastal body of water that has a free connection with the open sea. It is strongly affected by tidal action, and within it sea water is mixed, and usually measurably diluted, with fresh water. Fresh-Water Estuary A condition similar to a salt-water estuary except that the semi-enclosed body of fresh water has a free connection with a larger body of fresh water. An example is an area where a river empties into a large lake and there is considerable mixing between the two water bodies at the point of connection.
A partially enclosed area where freshwater from a river or stream comes into contact with salty oceanic water. It is characterized by water with salt content between that of fresh and marine environments, tidal effects, and populations of animals and plants that are distinct from either the freshwater or oceanic environments. Estuaries are among the most diverse and biologically productive ecosystems on Earth.
A semi-enclosed coastal body of water which has a free connection with the open sea. The seawater is usually measurably diluted with freshwater. The part of the river that is affected by tides. The zone or area of water in which freshwater and saltwater mingle and water is usually brackish due to daily mixing and layering of fresh and salt water.
A partially enclosed body of water where saltwater from the sea mixes with freshwater from rivers, streams and creeks. These areas are subject to tidal forces, like the sea, but are sheltered from the full force of ocean winds and waves by the coastline, marshes, and wetlands.
A body of water semi-enclosed by land, connected with the open ocean, and within which salt water is usually diluted by freshwater derived from the land. The estuary includes: (a) estuarine water; (b) tidelands; (c) tidal marshes; and (d) submerged lands. Estuaries extend upstream to the head of tidewater, except for the Columbia River Estuary, which by definition is considered to extend to the western edge of Puget Island.
n. An area where fresh water comes into contact with seawater, usually in a partly enclosed coastal body of water; a mix of fresh and salt water where the current of a stream meets the tides; estuarine– adj.
(Estuaire) The seaward end of a river where fresh water comes into contact with seawater and where marine phenomena predominate over fluvial phenomena.(Translation Bureau. Termium. Department of Public Works and Government Services Canada, 1999.)
An arm of the sea at the mouth of a river. Usually an estuary is characterized by a two-layer flow, where the top layer consists of fresh water flowing downstream and the bottom layer consists of salt water flowing upstream from the sea.
Any semi-enclosed coastal water, open to the sea, having a high fresh water drainage and with marked cyclical fluctuations in salinity. As a tideless sea, the Black Sea does not have estuaries, but its open limans are sometimes referred to as estuaries or estuary-type limans.
1. The portion of a river that is affected by tides. 2. A semi-enclosed body of water where the salinity of ocean water is measurably reduced by freshwater input. Estuaries are very important nursery regions for many coastal ocean species of fish and invertebrates.
An estuary is a semi-enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open seaPritchard, D. W. (1967) What is an estuary: physical viewpoint. p. 3–5 in: G. H. Lauf (ed.)