Coast

CGP pg 31

  • Created by: halep
  • Created on: 11-06-18 21:26
Waves -Waves are generated by wind blowing over the sea
- energy movements through water caused by the wind; - main way in which the sea erodes, transports and deposits material
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Energy of a wave is determined by
1. its height (distance between its trough and crest); 2. length (distance between two crests)
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Wave height and length vary
1. speed and 2. length of time a wave has been moving, 3. fetch (the distance of open sea over the wind has blown)
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Swash - When a wave breaks, water is washed up the beach.
moving up the beach; With a constructive wave, the swash is stronger than the backwash.
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Backwash - the water runs back down the beach
moving back to the sea; With a destructive wave, the backwash is stronger than the swash.
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Constructive waves
1. calm weather; 2. 1 meter high 3. swash is strong 4. erosion is limited; 5. transport and DEPOSITION of MATERIAL creating landforms
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Destructive waves
1. operate in storm conditions; 2. 5-6 m high; 3. the backwash is trong; 4. there is a lot of erosiom
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Wave Pounding
the battering ram action of the Weight of the pounding waves
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Corrosion
chemi9cal action : limestone dissolves in the sea water; sea salt react with certain rocks and cause them to rot
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Attrition
rock fragments grind each other down into smaller and smoother pebbles, shingle, sand; the sand is later deposited as beaches
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Corrasion = Abrassion
broken rock fragmens battering the land, cliffs and breaking off other pieces of rock
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Hydraulic Action
airs and water are trapped and COMPRESSED in rock surface cracks; when the sea moves again the air EXPANDS explosively weakening the rocks, enlarging the cracks and breakinig pieces off
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The fetch, also called the fetch length
is the length of water over which a given wind has blown; its effects are usually associated with sea state and when it reaches shore it is the main factor that creates storm surge which leads to coastal erosion and flooding.
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Other cards in this set

Card 2

Front

1. its height (distance between its trough and crest); 2. length (distance between two crests)

Back

Energy of a wave is determined by

Card 3

Front

1. speed and 2. length of time a wave has been moving, 3. fetch (the distance of open sea over the wind has blown)

Back

Preview of the back of card 3

Card 4

Front

moving up the beach; With a constructive wave, the swash is stronger than the backwash.

Back

Preview of the back of card 4

Card 5

Front

moving back to the sea; With a destructive wave, the backwash is stronger than the swash.

Back

Preview of the back of card 5
View more cards

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