Coastel Defences
- Created by: Sara Griffiths
- Created on: 02-06-13 19:16
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- Coastal Defences
- Rock Armour (Rip Rap)
- What? Piles of boulders placed at the foot of a cliff to break and absorb wave energy
- Cost? £1-4000 per metre
- Cheap/Easy to maintain and can provide habitats
- Disadvantage? Expensive to transport and it doesn't match the natural geology
- Sea Wall
- What? Concrete/ rock barrier at the foot of cliffs/top of beach
- Cost? Up to £6mn a year
- Advantage? Effective and long lasting
- Disadvantage? Unnatural, expensive and high maintenance
- Groynes
- What? Timber or rock structures built at a right angle to the coast to trap sediment and enlarge the beach
- Cost? £10,000 each
- Advantages? Can enhance the beach for tourists and low maintenance
- Disadvantage? Deprives other areas of sediment, unnatural, unattractive
- Beach Nourishment
- What? Addition of shingle/sand to make the beach higher broader. obtained locally
- Cost? £3000 per metre
- Advantage? Cheap, blends in, gives a bigger beach
- Disadvantage?High maintenance unless another type of defence is also used
- Dune Regeneration
- What? Planting of marram grass to help stabilise dunes
- Cost? £2000 per metre
- Advantage?Natural, popular with people and wildlife, cheap
- Disadvantage? Time consuming and can be easily damaged
- Marsh Creation
- What? Purposefully flooding low lying areas as they are an effective barrier to the sea
- Cost?£5-10000 per hectare
- Disadvantage? Land lost as flooded, farmers/ landowners must be compensated
- Cheaper than hard engineering, creates wildlife habitats
- Rock Armour (Rip Rap)
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