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Coastal Management
Coastal Weathering and erosion

Mechanical: the breakdown of rocks without changing its chemical composition.

It happens when the temperature alternates above and below 0°C (the freezing point of
Water gets into the cracks of the rock.
When the water freezes it expands, which puts pressure onto the…

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Solution: weak carbonic acid in seawater dissolves rock like chalk and limestone.

Types of waves:

The waves that carry out erosional processes are

1) Destructive waves have a high frequency
(10-14 waves per minute)
2) They're high and steep
3) Their backwash (the movement of the water…

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2) Headlands and bays form where there are alternating bands of resistant and less
resistant rock along a coast.
3) The less resistant rock (e.g. clay) is eroded quickly and forms a bay- Bays have a gentle
4) The resistant rock (e.g. chalk) is eroded more slowly and it's…

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Traction- large particles like boulders are pushed along the sea bed by the force of the

Suspension- small particles like silt and clay are carried along in the water

Saltation- pebble sized particles are bounced along the sea bed by the force of the water.

Solution- soluble materials dissolve…

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Spits are just beaches that stick out into the sea- they're joined to the coast at one end. If a spit
sticks out so far that it connects with another bit of the mainland, it'll form a bar. Spits and bars
are formed by the process of longshore drift.



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