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Coasts CSEC Geography
- 1. RM ACCOUNTS ED Geography notes CSEC rm accounts ed ram@2013
- 3. Wave Formation Frictional force between the wind and the sea surface Transfers circular motion to the water In open water we get swells As swells approach the shore waves are formed Waves break when the depth of the water is less than the wave height rm accounts ed ram@2013
- 6. Type of waves Two types Constructive – These build beaches by depositing sand, shingles and pebbles Destructive – These remove material from the shore rm accounts ed ram@2013
- 7. Destructive Waves These plunge against the shore rm accounts ed ram@2013
- 8. Characteristics - destructive Backwash > is greater than the swash Backwash > Swash 9 per minute Short wave lengths Plunge against the shore rm accounts ed ram@2013
- 9. Constructive Waves These spill onto the shore rm accounts ed ram@2013
- 10. Characteristics - constructive Swash < is greater than the Backwash Swash > Backwash 9 waves per minute long Spill wave lengths onto the shore rm accounts ed ram@2013
- 12. Wave Processes Erode Transport Deposit rm accounts ed ram@2013
- 13. Wave Erosion Hydraulic alone Attrition – Load knock against each other Abrasion shore Solution the rock Action – force of the water or Corrasion – Load erodes the – Sea water disolves minerals in rm accounts ed ram@2013
- 15. Wave Transportation The movement of material can be either of three ways: in, out and along In, deposition of material to form beaches Out, removal of material from the shore out to sea by the undertow Along the shore is called longshore drift rm accounts ed ram@2013
- 16. Longshore Drift rm accounts ed ram@2013
- 17. The effect of Groynes / Groines along a beach rm accounts ed ram@2013
- 18. Wave Deposition Deposition is the laying down of transported material Constructive waves and gently sloping shorelines are associated with deposition Where rivers discharge into the sea rm accounts ed ram@2013
- 20. Types of Coastal features Erosional – those produced by erosion Examples: cliff, notch, wave-cut platform, headland and bay, caves, arches, stacks and blowholes Depositional – those produced by deposition Examples: beaches, spit, tombolo and bars rm accounts ed ram@2013
- 21. Cliff, Notch and Wave-cut Platform rm accounts ed ram@2013
- 22. Headland and Bay rm accounts ed ram@2013
- 24. Headland and Bay cont’d rm accounts ed ram@2013
- 25. What happens next? rm accounts ed ram@2013
- 26. Wave Refraction The change in the direction of the waves as they approach the shore, converging on headlands and diverging as they approach the bay Stronger on the headlands Weaker in the bay rm accounts ed ram@2013
- 31. Depositional Features What are the two main conditions which lead to the formation of depositional features? Constructive waves and gently sloping shorelines are associated with deposition Where rivers discharge into the sea rm accounts ed ram@2013
- 33. A Beach A beach is a depositional feature. What material is laid down to form a beach? What is a bay-head beach? Draw a diagram to illustrate a beach. rm accounts ed ram@2013
- 34. Other Depositional features Spit Bar Tombolo Draw well labelled diagrams of the features identified above. rm accounts ed ram@2013
- 35. rm accounts ed ram@2013 Borrowed from: http://imgcdn.geocaching.com/cache/large/23a79aff-4609-43ed-a383-011910ee6680.jpg
- 36. A Spit rm accounts ed ram@2013
- 37. A Tombolo rm accounts ed ram@2013
- 38. A Bar – Baymouth Bar rm accounts ed ram@2013
- 39. rm accounts ed Borrowed from: greenfieldgeography.wikispaces.com - ram@2013
- 41. A Bar – Offshore Bar rm accounts ed ram@2013
- 42. thanks Physical Geography in Diagrams – R B Bunnett Dale Franklin – for the teaching concepts and the initial powe-rpoint. rm accounts ed ram@2013