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Coastal Defence (Sea Wall (Picture, These are walls made out of a hard…
Coastal Defence
Sea Wall
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Disadvantage :They create a strong backwash, which erodes under the wall. Sea walls are very expensive to build and maintain
Groynes
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Advantage : Groynes create wider beachers which slow the waves. This gives greater protection from flooding and erosion.
These are wooden or stone fences that are built at right angles to the coast. They material transported by longshore drift.
Disadvantage : They starve beaches further down the coast of sand, making them narrower. Narrower beaches don't protect the coast as well, leading to great erosion and flood.
Rock armour
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Disadvantage : Boulders can be moved around by strong waves, so they need to be replace.
Breakwater
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Advantage : They force waves to break offshore so their erosive power is reduced before they reach the shore
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