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An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. [1] Estuaries form a transition zone between river environments and maritime environments and are an example of an ecotone.
Organisms in marine ecosystems tolerate salinity, while many freshwater organisms are intolerant of salt. The degree of salinity in an estuary or delta is an important control upon the type of wetland (fresh, intermediate, or brackish), and the associated animal species. Dams built upstream may reduce spring flooding, and reduce sediment ...
A marine coastal ecosystem is a marine ecosystem which occurs where the land meets the ocean. Worldwide there is about 620,000 kilometres (390,000 mi) of coastline. Coastal habitats extend to the margins of the continental shelves, occupying about 7 percent of the ocean surface area.
A BEB adjacent to Crissy Field, San Francisco, facing the Golden Gate Bridge and Marin Headlands.. Beaches in estuaries and bays (BEBs) refer to beaches that exist inside estuaries or bays and therefore are partially or fully sheltered from ocean wind waves, [1] [2] which are a typical source of energy to build beaches.
2. A heavily eroded area along a river featuring steep banks, bluffs, ravines, or gorges. The term is used chiefly in the plural (i.e. breaks) and primarily in the United States and Canada. breaker 1. Another name for a breaking wave. 2. A reef, shoal, bar, skerry, or area of shallow water against which waves routinely break. breaker zone
an ecotone describes a variation in species prevalence and is often not strictly dependent on a major physical factor separating one ecosystem from another, with resulting habitat variability. An ecotone is often unobtrusive and harder to measure. an ecotone is the area where two communities interact.
The former term refers to any inlet or cove providing a physical refuge from the open ocean. An estuary is any physiographic feature where freshwater meets an ocean or sea. The northern portion of the bay is a brackish estuary, consisting of a number of physical embayments which are dominated by both marine and fresh water fluxes.
The river is profoundly influenced by the ocean's tides for over half its length, creating an estuary which stretches 153 miles (246 km) and includes a wide range of wetland habitats. The reserve sites reflect this diversity, from the brackish marshes of Piermont to the slightly brackish wetlands of Iona Island , and the freshwater tidal ...