Management G3

Management G3

1. Human activities impacts

2. Need to manage

   • Dawlish warren
     • Storm surge flooding the Exe estuary
       • 3,000 homes flooding
         • Starcross
         • Cockwood
         • Topsham
         • Exeter
     • A379
       • Important road
     • Railway
       • Feb 2014
         • £5million lost in revenue a day in Plymouth
         • Closed because of flooding
     • Ecology/ environment
       • Mud flats
       • Salt marshes
       • National reserve
         • 20,00 migratory brides
           • Vocet
     • Torism
       • 20,000 people/day in the summer
       • 750,000 people/year
       • £20 million/year

3. Impacts of coasts on human activities

4. Management strategies

   • Success of management strategies
   • Dawlish warren
     • Hard engineering
       • Rip rap
         • Large hard rock (granite) piled up
         • Expensive
         • Spaces between rocks weaken waves
         • Needs to be big enough so the sea doesn't take it away
       • Revetment
         • An angle slope of concrete
         • Prevents erosion at base of cliff
         • Expensive
         • Flooding is possible behind
       • Sea wall
         • Expensive
         • With stands strong waves
       • Groynes
         • Barriers made of wood
         • Expensive
         • Allow sand to build up but have a short life span
         • Short life span
       • Gabbions
         • Wire cages with rocks and pebbles
         • Reduce wave energy
         • Short life span
     • Upgrading
       • Cost of upgrading £14 million
         • Every £1 spent generates £9
         • £126,000,000 million
       • Should withstand a 1 in 500 year event