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The Coastal System - Coggle Diagram
The Coastal System
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Feedback loops
Positive
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Example -
as a beach starts to form is slows down waves, which can cause more sediment to be deposited, increasing the size of the beach.
Negative
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A beach is eroded, so cliffs are more exposed to attack from waves, causing sediment to be eroded from the cliff and deposited on the beach causing the beach to grow in size again.
Sources of energy
Tides
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Tides affect the position /height at which waves break on the shore. The area between high tide and low tide is where most landforms are created and destroyed.
Waves
Wave height is affected by wind speed and the fetch of the wave (maximum distance of sea the wind has blown over)
Waves break on the shore, friction between waves and sea bed causes them to slow down, and makes their motion elliptical
created by wind blowing over the sea- friction between wind and surface of the sea gives the water a circular motion
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Currents
General flow of water in one direction, caused by wind or variations in water temperature and salinity.
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Sediment sources
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Waves, tides and currents can transport sediment into the coastal zone from offshore deposits.
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Sediment cells
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Lengths of coastline, marked by two headlands.