Coastal Management

Mindmap for coastal management

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  • Created by: emily_w
  • Created on: 22-04-14 17:33
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  • Coastal Management
    • Types of hard engineering
      • Groynes
        • long wood/stone structures that stop longshore drift
        • £2000 per groyne
        • Advantages: bigger beach, people can fish off them and not too expensive
        • Disadvantages: increase erosion elsewhere and unattractive
      • Sea wall
        • concrete/rock barrier on top of cliff
        • Costs £2000 per metre
        • Advantages: Very effective and act as walkway
        • Disadvantages: doesn't look natural, expensive and high maintenance
      • Rock armour
        • barges bring boulders which are dumped at bottom of cliff, absorb wave energy
        • Costs £300 per metre
        • Advantages: cheap and good for fishing
        • Disadvantages: ugly, expensive and difficult to transport, does not fit with geology
      • Gabions
        • rocks/boulders held in wire mesh
        • costs £100 per metre
        • Advantages: cheap, works with vegetation, can be used for landscaping
        • Disadvantages: not very strong and may not fit with geology
    • Types of soft engineering
      • Managed retreat
        • build new sea defences further inland after abandoning old ones
        • cost=original defence material+cost of land flooded
        • Advantages: creates salt marshes and reduces flooding in some areas
        • Disadvantages: people lose land, homes and business; money spent on original defence wasted
      • Salt marsh creation
        • low coast areas flooded to become salt marshes
        • Costs £5000-10,000 per hectare
        • Advantages: cheap, creates habitats
        • Disadvantages: need to compensate for land loss
      • Dune regeneration
        • Fence off dunes and plant Marran grass to stabilise
        • Costs £2000 per 100m
        • Advantages: cheap and maintains natural environment
        • Disadvantages: Time consuming, people may trespass, damaged by storms
      • Beach nourishment
        • add sand/shingle to beach to make it higher
        • costs £3000 per metre
        • Advantages: cheap and easy to maintain, increase tourist potential
        • Disadvantages: needs near constant maintenance
    • Coastal management plans
      • Hold the line
        • keep up and improve existing defences
      • Advance the line
        • build new, higher, better defences and only protect vulnerable land
      • No intervention
        • Don't do anything and let nature take its course.
        • Erosion happens but land is built up elsewhere
    • Hard engineering: For and against
      • For
        • Save local homes/ businesses
        • Tourism industry preserved
        • Politicians gain support by saving beaches
      • Against
        • Taxpayers who don't live on coast have to pay
        • Habitats damaged
        • People living downdrift lose beach
  • Advantages: bigger beach, people can fish off them and not too expensive
  • costs £3000 per metre
  • Politicians gain support by saving beaches

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