Geography Coastal Change and Conflict

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What is the energy of the wave determined by?
1) The height (distace between trough and crest) 2) The Length (between two crests)
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Features of destructive waves
1)High Erosion rates 2)Frequent waves 3)Stronger backwash 4)Steep and high
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Features of constructive waves
1)Deposition of sediemt 2)Less frequent 3)Stronger swash 4)Long and flat
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Hydraulic Action
swash> Air and water are trapped and compressed in rock surface cracks>backwash>air expands>pieces of rock are blasted away
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Attrition
Rock fragments grind each other down into smaller pebbles
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Abrasion
Loose rocks are thrown against the base/bottom of a cliff and chip rock off
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Process of longshore drift
Movement of material along a beach. Swash approaches at an angle> pushes sediment with it> backwash drags material back into the sea. ZIGZAG SHAPE
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What does the size of a wave depend on?
The strength of the wind, how long the wind blows for, the length of the fetch
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Concordant Coastline example
LULWORTH COVE DORSET. Only one rock type parrallel to the sea.
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How Lulworth Cove formed
1) Hydraulic action and abrasion eroded gas and cracks in the rock 2) Punched through the rock 3)Soft rock behind it quickly erodes
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Discordant coastline example
OLD HARRY ROCKS SWANAGE DORSET. rock strata perpendicular to the sea
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How Old Harry rock formed
Headlands are made of resistant rock, softer rock next to it erodes quicker forming bays.
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Other cards in this set

Card 2

Front

1)High Erosion rates 2)Frequent waves 3)Stronger backwash 4)Steep and high

Back

Features of destructive waves

Card 3

Front

1)Deposition of sediemt 2)Less frequent 3)Stronger swash 4)Long and flat

Back

Preview of the back of card 3

Card 4

Front

swash> Air and water are trapped and compressed in rock surface cracks>backwash>air expands>pieces of rock are blasted away

Back

Preview of the back of card 4

Card 5

Front

Rock fragments grind each other down into smaller pebbles

Back

Preview of the back of card 5
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