Coastal Defences
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Transcript of Coastal Defences
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Coastal DefencesGroynes, Physical Stone defences.
Case study location : Barton On Sea Southern England
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Waves break on the beach and moves up the
beach- SWASH
First line of coastal defence- heavy large rocks
Soft rock on the back wall of the coast
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Waves move back down the beach dragging along beach material- BACKWASH
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Water nearly totally drains back ready for the next wave to break
on the beach
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Wooden groyne
Heavy stone groyne
WAVE DIRECTION
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WHEN THE WAVE BREAKS ON THE BEACH IT TOTALLY COVERS THE
GROYNE
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Note how the waves retreat at different
rates down the beach.
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Large angular rocks break the energy of the waves
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Cliffs constructed from soft unconsolidated material
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Aerial erosion also takes place e.g. Wind and rain
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Large part of cliff has fallen down the slope
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Cliff line erodes and becomes dangerous
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Deposition
Direction of the waves
Erosion