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18 Cards in this Set
- Front
- Back
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What is a sea wall |
Concrete wall reflects waves back to sea |
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Pros/cons of gabions |
P= Absorb wave energy reduce erosion C= ugly wire caging can corrode |
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What is a groyne |
Wood/stone fences Cut at right angle to coat and trap material being transported by long shore drift |
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Pros/cons of beach nourishment |
P=create wide beaches and slows waves protect from F and E C=sand taken from sea beds can kill organisms sponges and coral |
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What is dune regeneration |
Create and restore sand dunes by plants stabilisation ot nourishment |
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£ groynes |
Fairly cheap |
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What is beach nourishment |
Sand /shingle from elsewhere lower beach or sea bed added to upper beach |
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What is rock armour |
Boulders piled up along coast Rip rap |
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£ of gabions |
Cheap +easy |
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Pros/cons of sea walls |
P= prevent F+E C=Strong backwash erode under wall |
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What is a gabion |
Walls of wire cages filled with rocks |
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Pros/cons of rock armour |
P= absorb wave energy reduce F+E C= can be displaced by strong waves needs replacing often |
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£of beach nourishment |
Very expensive has to be repeated |
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Pros/cons of groynes |
P=wider back slows waves and protect against F+E. C=starve beaches further along coast |
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£of rock armour |
Fairly cheap |
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Pros/cons of dune regeneration |
P=barrier between land and sea wave energy absorbed prevents F+E C=limited to a small area |
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£of sea wall |
High maintenance and building costs |
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£ of dune regeneration |
Stabilisation is cheap Nourishment is expensive |
