Dawlish Warren

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Slides to show different management strategies at this coastal spit.

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Dawlish Warren

  1. 1. Dawlish Warren CASE STUDY Process Erosion Management
  2. 2. The Process and location Dawlish Warren
  3. 3. •The source of material – Langstone Rock Can you identify joints, lines of weakness, wave cut platform, notch?
  4. 4. Can you see Langstone rock in the distance?
  5. 5. The line of the spit on the offshore side towards the River Exe
  6. 6. Along the crest
  7. 7. Different size beach material gradually builds up to consolidate the feature
  8. 8. Inshore, vegetation plays an important role to stabilise the sand
  9. 9. Small meres appear with brackish water
  10. 10. The town of Exmouth across the estuary
  11. 11. Modification by Humans Dawlish Warren
  12. 12. At the proximal end buildings occupy the crest line [car park]
  13. 13. From the car park to the spit visitors are ‘led’ by boardwalk
  14. 14. Foot erosion is evident aroung picnic benches …
  15. 15. … or where corners have been cut off
  16. 16. Railway sleepers used on the onshore side to direct tourists
  17. 17. In some places even vehicles have contributed
  18. 18. The key to conservation is to re-establish Marram grass that binds together the sand and promotes soil development.
  19. 19. Left alone a thick mat builds up
  20. 20. Beside the path, experimental plots have been fenced off at different ages
  21. 21. The contrast between the areas is evident
  22. 22. Other uses – golf course
  23. 23. Dog Walking - note the barrier to stop ‘ridge walking’
  24. 24. Management Dawlish Warren
  25. 25. Revetment process at the proximal end
  26. 26. Lifeboat ramp for rescue users
  27. 27. Promenade opened in 1993
  28. 28. Promenade, sea wall and rock armour
  29. 29. Rock armour used to protect the old sea wall, can you identify any other ‘important’ users?
  30. 30. Good view from the railway bridge of wall, rock armour and supply of material
  31. 31. Sea wall with re-curve
  32. 32. Built in sections, the toe is protected with granite blocks
  33. 33. Groynes toward the distal end
  34. 34. Below the sand gabions have been used to encourage the sand to stabilise
  35. 35. These have been eroded away particularly at path corner
  36. 36. Soft Engineering – reused Christmas trees
  37. 37. The wind blows through sand pitching and building up to bury them. Eventually they should bio-degrade
  38. 38. Dawlish Warren

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