Slip or slump?

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Slum of Valentines Day 2011 and subsequent follow up after re-alignment of Coast to Coast path

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Slip or slump?

  1. 1. Slip or Slump Valentines Day Massacre? St Bees Coast 2011
  2. 2. Coastal Features <ul><li>Tomlin Head faces the West </li></ul><ul><li>The Golf Course cliffs faces the west </li></ul><ul><li>Between these a bay faces southwards and so takes the full force of the wind and waves </li></ul><ul><li>Tomlin Head is made from younger Red sandstone </li></ul><ul><li>The Golf course is made from loose debris </li></ul>
  3. 3. Slip or Slide? <ul><li>Carson </li></ul><ul><li>= Kirkby </li></ul>SLOW WET DRY FAST Creep Slide Slump
  4. 4. Obviously not a slow creep as the movement was rapid [overnight]
  5. 5. But was it a slip [dry]? or slump [wet]? Notice the rounded ‘toe’
  6. 6. Notice the shapes [there were two movements]
  7. 7. Easternmost Area of erosion Movement toe Cone shaped top
  8. 8. Westernmost Can you identify the two distinct zones? Why are they different colours?
  9. 9. Colour Light WET DRY Light
  10. 10. To the left you can see how saturated this is – 100 mm of rain has fallen in the last two weeks This makes it – Heavier, Lubricated, and created a junction – the shear plane
  11. 11. From the top you can see the two ‘toes’
  12. 12. Putting all of the evidence together- <ul><li>Carson </li></ul><ul><li>= Kirkby </li></ul>SLOW WET DRY FAST Creep Slide Slump <ul><li>Saturated soil </li></ul><ul><li>Concave erosion and convex shape </li></ul><ul><li>Easily identifiable ‘toe’ </li></ul>
  13. 13. So, the footpath is closed

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