Coastel Defences

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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


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