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sea defences - Coggle Diagram
sea defences
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Sea Wall
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description
Built along the cliff front, often to protect settlements. They are often recurved which means waves are reflected back on themselves.
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Groynes
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negatives
Beaches to the south of the defences are starved of beach material due to their effect on long shore drift. they Can also be unattractive
description
Built at right angles to the beach to trap sediment from being moved along by waves as they travel up the beach. They help stop
Offshore breakwaters
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description
These are large concrete blocks and boulders located off shore to change the direction of waves and reduce longshore drift. They also help absorb wave energy.
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Managed retreat
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description
When coastal land is considered to be low value, it is allowed to erode or flood naturally
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