Coastal Erosion

Coastal erosion

There are four types of coastal erosional process similar to those of the river.

Hydraulic action

When waves hit the coast repeatedly, they weaken the rocks, break them and carry them away.
Water enters the rock lines of weakness such as joints and fault.
The air inside the rocks become trapped and is compressed by the water.
The compressed air exerts pressure on the joints and faults and when the waves return to the sea, there is a sudden release in pressure.
The rock expands with great force and widen the joint and faults.
Repeating process of expansion and compression eventually cause the rocks to break into smaller pieces.


When materials are carried by waves are thrown repeatedly against the coast
They are gradually erode the coast.


When materials are carried away , they collide with one another.
Eventually, the materials break down into smaller pieces and become smoother and more rounded over time.


Water in the waves reacts chemically with the soluble minerals in the rocks along the coast and dissolves them.
Limestone coast when react with seawater dissolves.
Coastal Erosion Process



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