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Estuaries contain nutrients and support many organisms because there is plenty of light for photosynthesis. They foster plankton, which provides food for animals. Estuaries provide protected harbors, access to the ocean, and connection to a river. They provide food, wild life, and recreation.
Each town originally developed on a site giving two distinct values:
1) the river's lowest practicable bridging-point at thetime,
2) and the highest practical navigation limit for sea-going vessels, giving also a sheltered, easily-accessible loading / unloading dock.
At the timethe lower reaches of rivers were also valuablefor inland transport, soeverything came together to give the town's location.
As ships enlarged so the docks had to be moved further downstream, but this was balanced by developments in transport generally.
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Summerians
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The three types of estuaries are coastal plain estuaries, bar-built estuaries, and tectonic estuaries. Coastal plain estuaries form when sea levels rise, flooding existing river valleys. Bar-built estuaries are separated from the ocean by sandbars or barrier islands. Tectonic estuaries result from land movement, such as faults or folding, creating a depression that fills with water.
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