Erosion Landforms Coasts

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coastal erosion landforms

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Erosion Landforms Coasts

  1. 1. Coasts 4 – Transportation & Deposition
  2. 2. Coasts 4 - Transportation <ul><li>Just like rivers, 4 main types of transportation along coasts: </li></ul><ul><li>Solution </li></ul><ul><li>Suspension </li></ul><ul><li>Saltation </li></ul><ul><li>Traction </li></ul>Dissolved – dissolved material Bouncing – small stones Carried along – silt sized particles Rolling – large stones
  3. 3. How is material carried along the shore? By Longshore Drift… <ul><li>http://www.bbc.co.uk/schools/riversandcoasts/coasts/change_coast/pg_14_flash.shtml </li></ul><ul><li>To do:- draw diagram using p302 and fill in gaps exercise </li></ul>
  4. 4. Deposition <ul><li>Deposition occurs when: </li></ul><ul><li>Waves have low energy </li></ul><ul><li>The wind is mild </li></ul><ul><li>Conditions are calm </li></ul><ul><li>The sea bed is flat & shallow </li></ul><ul><li>There is a lot of friction </li></ul><ul><li>The coastline changes direction </li></ul>
  5. 5. What are the distinctive landforms resulting from erosion?
  6. 6. Headlands and bays http://www.bbc.co.uk/schools/riversandcoasts/coasts/change_coast/pg_05_flash.shtml
  7. 7. Headlands and bays - fill in the gaps <ul><li>Headlands and bays form along coasts that have alternating _______ (harder) and less resistant (softer) rock. Where there is harder rock the coast will be eroded more _______ leaving a _________ which sticks out into the sea. Where there is softer rock erosion will be _______ and a _____ will form. This kind of coast is known as DISCORDANT - the rocks are at right angles to the coast. </li></ul>Now label the more resistant headlands and the less resistant bays on each mini picture.
  8. 8. Wave-cut platforms and cliffs http://www.bbc.co.uk/schools/riversandcoasts/coasts/change_coast/pg_07_flash.shtml Annotate the diagram - 18.4
  9. 9. <ul><li>Working in pairs, match up terms and definitions by matching up letters and numbers. I will come round to check answers, then stick the sheet onto you work. You have 5 minutes! </li></ul>To do:-
  10. 10. Caves, Arches, Stacks & Stumps <ul><li>http://www.bbc.co.uk/schools/riversandcoasts/coasts/change_coast/pg_11_flash.shtml </li></ul>
  11. 11. To do:- <ul><li>Worksheet 2.1 – use p301 to help you </li></ul><ul><li>Fill in gaps exercise and labelling of photos of erosional features. </li></ul><ul><li>Also, write down key fact: Caves, arches, stacks and stumps are made when a narrow headland made from hard rock is eroded. </li></ul>
  12. 12. Plenary: Blockbuster C D F A A C N S E
  13. 14. Depositional features
  14. 15. Depositional Features - Beach
  15. 16. How a spit is formed… http://www.school-portal.co.uk/GroupDownloadFile.asp?file=21605 Spits are created through the process of deposition. A spit is an extended stretch of beach material that projects out to sea and is joined to the mainland at one end. Spits are commonly found where there is a prevailing wind and where there is longshore drift. An example of a spit is Spurn Head , found along the Holderness Coast in Humberside.
  16. 17. How a spit is formed…
  17. 18. Spit development <ul><li>If a spit doesn’t curve or stop growing, 2 landforms may result: </li></ul><ul><li>SAND BAR </li></ul><ul><li>These develop when a spit grows across to join another part of the coastline. They are rarer than spits. If there is a river feeding into the sea or if the wind changes direction they will not form. E.g. Slapton Ley, Devon. </li></ul>
  18. 19. Spit development continued… <ul><li>2. TOMBOLO </li></ul><ul><li>If a spit grows out to attach an island to the mainland it will form a tombolo. E.g. Chesil Beach, Dorset. </li></ul>
  19. 20. Homework:- <ul><li>Explain, with the aid of a diagram/s, how spits are formed and give a named UK example and its location. </li></ul><ul><li>Use p303 of textbook to help you. </li></ul><ul><li>Animation web address: http://www.school-portal.co.uk/GroupDownloadFile.asp?file=21605 </li></ul>

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