Strong wire cage with rocks, pebbles and stones inside.
Protects the coastline by stopping the waves from hitting the cliffs
Reduces the power of the waves by absorbing the wave energy.
They are very cheap to make because they are made from natural materials.
DISADVANTAGES
They take up a lot of space.
Over time the cages will rust.
They could easily be damaged by storm waves.
Once the rocks inside have eroded the cages will have to be replaced.
THIS IS A SHORT TERM MEASURE!!!
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GROYNES
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Groynes
ADVANTAGES
They are wooden structures that go along the beech at angles to prevent long shore drift.
The wave energy gets absorbed in the groynes.
It catches and prevents sediment and sand from which helps to build up a beech.
DISADVANTAGES
They have to be maintained as they dont last very long.
It stops the rest of the beech further down from getting any more sediment which could course the beech to become smaller (TERMINAL GROYNE SYNDROME)
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REVETMENTS
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Revetments
ADVANTAGES
They are sloping structures placed on banks or cliffs to prevent erosion.
They are designed to absorbed the energy of the incoming wave.
They catch sediment from long shore drift which helps to build up a beech.
DISADVANTAGES
It stops the rest of the beech further down from getting any more sediment which could course the beech to become smaller (similar to terminal groyne syndrome)
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SEA WALLS
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Sea Walls
ADVANTAGES
They are curved concrete walls which stop the waves from hitting the cliffs.
They are designed to reflect the wave energy back into the sea.
It protects the foot of the cliff from erosion.
They are extremely strong and have a long lifespan.
It can also help to prevent flooding in the area.
DISADVANTAGES
They are very expensive to build.
They aren't visually pleasing.
They dont look natural to the beech as they are mostly made from concrete.
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RIP-RAP
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Rip-rap
ADVANTAGES
They are huge boulders of granite or other hard rocks.
The rip-rap works by absorbing or deflecting the impact of the wave.
They are placed at the bottom of cliffs to prevent erosion.
They are designed to allow water to drain through them.
DISADVANTAGES
Rip-rap does not maintain the natural look of the beech.
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TETRAPODS
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Tetrapods
ADVANTAGES
These are usually made of concrete.
Their unique shape allows them to absorbe wave energy but allow water to drain through.
They have a good lifespan because they are so strong and stable.
DISADVANTAGES
Tetrapods don't maintain the naural look of the beech.
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