coastal erosion - PowerPoint PPT Presentation

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coastal erosion

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Title: coastal erosion Author: TA Last modified by: eoin Created Date: 1/4/2004 10:08:34 AM Document presentation format: On-screen Show Other titles – PowerPoint PPT presentation

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Title: coastal erosion


1
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Old cliff line
Original Land surface
stack
stump
Wave-cut platform
Natural Arch
2
Cliff line
Joints and beds allow waves to attack the cliff
more easily
HIGH TIDE LEVEL
Waves can use rocks to erode the cliff
Wave cut platform
Wave cut notch
3
Sediment accumulation due to Longshore Drift
Groynes
Waves approach beach at oblique angle
4
Wave-cut platform
Wave built terrace
Ouch!
large angular rocks
rocks and pebbles
soft sand
5
The force of the waves pushes air into cracks in
the rock
The compressed air exerts enormous pressure at
the tip of the crack. As the water falls back the
air pressure is released and rock is pulled out
from the crack further enlarging the hole.
6
Constructive Waves
Spilling Breaker
Powerful Swash
Weak Backwash
7
Constructive Waves
Crashing breaker
Weak swash
Powerful Backwash
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