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Physical Case studies (Weather Hazards: Boscastle Flood (Causes (Water did…

- - - - A larger/taller bridge was built to allow more water to flow under it
      - River channel was widened and deepened through the town to deal with more water
      - Homes were repaired and rebuilt
    - - Helicopters rescued people from roof tops
      - Cars were removed from the shore/river & debris was cleared up
- - - - NGO ShelterBox provided water purification equipment, blankets, solar torches etc.
      - 1215 evacuation centres
      - Soldiers required to restore order from widespread looting.
      - HMS Daring
    - - Multilateral aid from ACs sent millions
      - Homes rebuilt
- - - - Deaths
  - - - Reverse ocean currents+winds
        
        High pressure in Australia
        
        Drought
        
        Cold water by Australia
- - - - Pre-built temporary bridges
      - Dredge blocked river
      - Clearing ash
    - - Satellite imagery
      - Thermal imaging
      - Gas chromatography
      - Seismometers
      - Tiltmeters
      - Computer modelling
  - - - Easy Jet tos £90,000,000
    - - Selling volcanic ash
      - ~1 billion tourists several years after
    - - Better crops in the long term
    - - Kenya lost 1mill flowers not sold
- - - - Allow natural flooding of floodplains
      - Use natural material to stabilise banks
      - Allow natural flow (e.g. meanders) to slow the river
      - Peat bogs & afforestation
      - Log dams to slow the river
    - - Dams
      - Dredging to increase depth
      - Leeves
      - Bank reinforcement (e.g. rip rap)
      - Channel reinforcement to make channel smoother + flow faster
  - - - Waterfalls were removed when bridge was built
      - Rapids due to alternating soft/hard rock
      - Waterfalls on tributaries (Cleddon Falls)
        
        Deep gorges form
      - Mountainous, impermeable rock
      - High rainfall, cold winters
        
        Freeze thaw, mass movement
    - - Steep limestone river cliff--Symonds Yat
      - Leeves--river floods depositing alluvium on the banks
      - Fertile floodplains
      - Flows into River Severn
      - Bristol estuary
    - - Annual flooding refills oxbow lakes
      - Oxbow lakes which are cut off by depositon then fill in/dry out
      - Meanders--lateral erosion
      - Sandstone--soft sedimentary rock
      - Deep river channel