mini case studies part 2

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  • Created by: roseb00d
  • Created on: 02-05-23 21:41
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  • Mappleton (case study)
    • mappleton is along the holderness coast - north east of England
    • it is protected by groynes with the aim to protect the B1242
      • these groynes have disrupted the sediment cell in the area increasing the erosion futher along the cell
        • especially at the spit at spurn head
          • the spit at spurn head is eroding more rapidly as less sand/ deposits end up thier
            • the coastline goes from hard chalk at flamborough head to soft chalk at spurn head
            • this provides less protection for hull and the humber estuary
    • the coastline is mainly boulder clay and goes very soft
      • the coastline goes from hard chalk at flamborough head to soft chalk at spurn head
  • lulworth cove (cove formation and case study)
    • cove formation
      • 1. concordant coastline  needed , hard rock facing the sea
      • 2. a geo is formed
      • 3. geo is eroded till it hits the softer rock behind it
      • 4.it erodes laterally and retreats till it hits hard rock again
        • 5. it then erodes laterally at a slower rate and erodes horizontally at a quicker rate
    • the formation of the rocks at the Lulworth cove (moving further from the sea)
      • 1. portland and purbeck limestone
      • 2. wealden clay
      • 3. gault and greensand , sandstone
      • 4. chalk
      • Lulworth Cove owes its form to the tectonic upheavals
        • the bedrock around lulworth cove is sedimentary, this means that they were originally laid down flat with layers froming on top of each other
        • the oldest stone lies closest to the sea and the youngest further inland
    • at the end of the last ice age a river formed with from glacier melt water. The river cut the valley and breached the portland stone
      • the rising sea flooded the valley and further eroded the cliffs to form a cove
    • the current entrance to the cove is about 120m wide

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