Estuary | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-06

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Estuary


00:01:52 1 Definition
00:03:33 2 Classification based on geomorphology
00:03:44 2.1 Drowned river valleys
00:04:46 2.2 Lagoon-type or bar-built
00:07:01 2.3 Fjord-type
00:08:35 2.4 Tectonically produced
00:09:18 3 Classification based on water circulation
00:09:29 3.1 Salt wedge
00:10:13 3.2 Partially mixed
00:10:43 3.3 Well-mixed
00:11:14 3.4 Inverse
00:11:49 3.5 Intermittent
00:12:08 4 Physiochemical variation
00:13:26 5 Implications for marine life
00:15:54 6 Human impact
00:18:31 7 Examples



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SUMMARY
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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.Estuaries form a transition zone between river environments and maritime environments. They are subject both to marine influences—such as tides, waves, and the influx of saline water—and to riverine influences—such as flows of fresh water and sediment. The mixing of seawater and fresh water provide high levels of nutrients both in the water column and in sediment, making estuaries among the most productive natural habitats in the world.Most existing estuaries formed during the Holocene epoch with the flooding of river-eroded or glacially scoured valleys when the sea level began to rise about 10,000–12,000 years ago. Estuaries are typically classified according to their geomorphological features or to water-circulation patterns. They can have many different names, such as bays, harbors, lagoons, inlets, or sounds, although some of these water bodies do not strictly meet the above definition of an estuary and may be fully saline.
The banks of many estuaries are amongst the most heavily populated areas of the world, with about 60% of the world's population living along estuaries and the coast. As a result, many estuaries suffer degradation from a variety of factors including: sedimentation from soil erosion from deforestation, overgrazing, and other poor farming practices; overfishing; drainage and filling of wetlands; eutrophication due to excessive nutrients from sewage and animal wastes; pollutants including heavy metals, polychlorinated biphenyls, radionuclides and hydrocarbons from sewage inputs; and diking or damming for flood control or water diversion.