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COASTS (WAVES (Destructive Waves (erodes, strong backwash, big storm waves…
COASTS
WAVES
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Longshore Drift
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the particles are moved towards the beach at an angle (direction depends on the prevailing wind direction) and then is taken back into the sea by the back wash. Repeat
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WHY DO WAVES BREAK
As the water becomes shallower, the bottom of the wave slows down due to the friction, while the top of the wave catches up which makes it crasg
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COASTAL PROCESSES
TRANSPORTATION
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SALTATION- small stones, pebbles and silt bounces along the sea bed
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DEPOSITION
is when material that is being transported is dropped by constructive waves. This happens due to a lack of energy
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They are likely to occur when: waves enter an area of shallow water, a sheltered area, where there is little wind
EROSION
ATTRITION= breaks up the boulders, pebbles, shingle, and sand from beach. As rocks are rolled up and down the beach, they collide with each other and become smaller and rounder
ABRASION= boulders, pebbles, shingle and sand are picked up and thrown against the cliff, removing particles of rock from the cliff face
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HYDRAULIC ACTION= waves weight and force crash against a cliff removing particles of rocks from the cliff. Also includes processes of where air is trapped by a wave in a crack in the cliff, pressure then opens up the crack further, weakening the cliff.
LANDFORMS OF EROSION
DISCORDANT COASTLINE
as the waves erode from side of the rocks, soft rock gets eroded away by hydraulic action and abrasion, forming a bay. But hard rock doesn't get eroded away, making them become a headland
CONCORDANT COASTLINE
as waves come from base to top, hard rock gets eroded first by hydraulic action + abrasion which causes a breach. soft rock then gets eroded away forming a cove. But hard rock behind soft rock doesnt get eroded.
