Coastal Management Case Studies

  • Created by: charlia
  • Created on: 29-04-15 09:54
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  • Coastal Management
    • Hard Engineering - Holderness
      • Schemes used
        • Eastern side of Spurn head is protected by Groynes and riprap
        • Gabions protect Hornsea caravan park
        • £2 million spent to protect Mappleton.
        • Easington gas terminal protected by a revetment.
      • Advantages
        • Groynes trap sediment increasing width of beaches which protects the local area.
        • Rip Rap are often seen as a more attractive form of hard engineering as they can blend into the environment 
        • The schemes are locally successful
    • Soft Engineering - Blackwater Estuary
      • Schemes used
        • Beach nourishment at Mersea Island
        • Marsh stabilisation, planting stakes and brushwood on the water line encourages sediment to build up e.g. Ray Creek
        • Coastal realignment at Orplands - sea wall breached, 40 hectares of farmland.
      • Advantages
        • More sustainable in the long term e.g. to repair the sea wall at orplands would've costed £600,000. 40 hectares valued at £600,000 - but marshland created will defend the coast for longer as it's self repairing
        • Marshland provides habitats
        • Lower environmental impact and economic cost than hard engineering schemes.
      • Disadvantages
        • Parts of the Orplands site are still bare mud and not marshland, which is very easy to erode. Grazing land has been lost.
        • Beach nourishment requires a high amount of maintenance, without it the new sediment would be eroded just as the other sediment was e.g. at waikiki beach in hawaii in 2012 $2.2 million beach nourishment project but just a year after the replenished sand was gone.
        • Marshlands can be quickly destroyed in times of high erosion e.g. storm surges


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