Swanage power point presentation (reduced)

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Swanage power point presentation (reduced)

  1. 1. Swanage Decision Making Exercise
  2. 2. Where is Swanage?
  3. 3. Swanage Beach narrows Wide beach Longshore drift from south to north
  4. 4. Longshore Drift Foreshore Pebbles and sediment moved onto beach Pebbles and sediment moved back down the beach Pebbles and sediment moved onto beach Pebbles and sediment moved back down the beach Pebbles and sediment moved onto beach
  5. 5. Swanage Longshore drift from south to north Sediment is moved from south to north Banjo Pier
  6. 6. Groynes The groynes extend at right angles to the beach and act like arms to catch sediment. These groynes are very old and run down.
  7. 7. The sea at work The beach is hit by strong waves which have travelled across the Atlantic Ocean. Groynes are designed to trap sand and sediment and to encourage deposition.
  8. 8. Powerful waves
  9. 9. Swanage Banjo Pier Makes people’s homes safer and insurance premiums lower. Built at right angles to the beach Contains an outflow for the River Swan. Reduces the risk of flooding in the town by moving run- off into the sea very quickly.
  10. 10. Beach south of the Pier Beach is wide and sandy. Deposition is taking place. The beach is hit by strong waves which have travelled across the Atlantic Ocean. Wide variety of tourist services and attractions.
  11. 11. Beach South of the Pier facing the NorthBeach is wide and sandy. Deposition is taking place. Sand and pebbles are building up against the pier Less sand and sediment is carried past the pier.
  12. 12. Beach north of the pier Sea wall to protect houses and road from flooding and erosion. Old groynes which were to trap sediment and sand. Beach is narrower north of the pier. The pier is stopping as much sand and sediment getting to this part of the beach.
  13. 13. Where the sea meets the cliff Top layers of cliff are permeable Beach huts and other tourist facilities are very close to the edge of the beach.
  14. 14. Cliff erosion Top layers of cliff are permeable Lower layers of cliff are impermeable Rotational Landslips Erosion and landslipping has become worse since the Banjo Pier was built
  15. 15. Landslip Hazard Erosion and landslipping has become worse since the Banjo Pier was built Landslips are threatening human activities such as this path. The Banjo Pier is blocking the sand and sediment that used to be deposited here.
  16. 16. Landslip Hazard Permeable layers at top of cliff. Impermeable layers at bottom of cliff. Most recent landslip blocking the path.
  17. 17. Managing the Landslips Steel piling is inserted into lower cliff. Pipes put into cliff to drain off water. Concrete reinforcements to help stabilise the cliff (stop it from slipping).
  18. 18. Groynes at work
  19. 19. Beach north of the pier

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