L5 dep features & playdoh

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L5 dep features & playdoh

  1. 1. Depositional Coastal Landforms Depositional Landforms
  2. 2. Depositional Landforms (p154) • Video here • Three main features; – Beachs – Spits – Bars Depositional Landforms
  3. 3. Beaches – Depositional feature Depositional Landforms
  4. 4. 1. Beaches – wave refraction Depositional Landforms
  5. 5. Beaches – Berms and ridges These show high tide marks Depositional Landforms
  6. 6. 1. Beaches • Beaches are where sand and _______ has been deposited in ________ bays. Waves mirror the shape of the bays and therefore _______ around the bay, loosing _______ . This causes _________. • Deposition Energy Sheltered Shingle Refract • ______ beaches also form when ______ are eroded by high _______ waves. Ridges or ______ form along these beaches, showing high tide marks Cliffs Energy Pebble Berms Tide Depositional Landforms
  7. 7. 2. Spits • Video here Spits (from 2.00)
  8. 8. 2. Spits • Spits form when ______ _______ ______ carries sediment along a coastline. When the coastline _____ direction , the sea deposits the material it has been carrying because it meets a river ____ . The change in water _____ means that sediment is _______ and a long ridge starts to form, a ____. At the end of the spit, seasonal changes in wind direction can create ______ ends. The sheltered area behind a spit is where a ____ marsh develops. • Speed Changes Deposited Spit Mouth Salt Long Shore Drift hooked Depositional Landforms
  9. 9. Annotate your map! Fetch - direction of prevailing winds (and therefore waves) in approaching the beach. Direction of Long-Shore Drift. Short term changes in wind and wave direction causing the curved ends to the spit. Original Coastline Salt Marsh Fastest current at the centre of the river. River Estuary
  10. 10. Depositional Landforms
  11. 11. Bars Depositional Landforms
  12. 12. 3. Bars Depositional Landforms
  13. 13. 3. Bars • If a spit develops across a bay, it may build across the two headlands to create a bar. E.g. Slapton Ley in Devon. Depositional Landforms
  14. 14. Playdoh features! • Now its your turn to design some of these features! • Start of designing erosional features (cave, arch, stack, stump) and then have a go at depositional features • Here are some examples … Depositional Landforms
  15. 15. You say we pay • Arch • Spit • Swash • Erosion • Long shore drift Depositional Landforms
  16. 16. You say we pay • Stack • Headland • Backwash • Transportation • Hydraulic Action Depositional Landforms

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