L3.ap longshore drift and deposition
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L3.ap longshore drift and deposition

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L3.ap longshore drift and deposition L3.ap longshore drift and deposition Presentation Transcript

  • What processes shape our coastline? What processes shape our coastline?
  • Recap on coastal erosion – its very similar to river erosion … What processes shape our coastline?
  • Stones and rocks carried by the sea knock against each other and over time are weakened, causing bits to fall off and reduce in size. ATTRITION When a parcel of air is trapped or compressed, either in a joint in a cliff or between a breaking wave and a cliff. Small parts of the cliff will then break off. ABRASION This involves dissolving limestone by carbonic acid in sea water, and the evaporation of salts to produce crystals which expand as they form and cause the rock to disintegrate. SOLUTION The wearing away of cliffs by sand, shingle and boulders hurled against them by the waves. The most effective method of erosion. HYDRAULIC ACTION COASTAL EROSION VIDEO HERE What processes shape our coastline?
  • B. Coastal transportation
  • B. Coastal transportation 1. Solution 2. Suspension 3. Traction 4. Saltation What processes shape our coastline?
  • Diagram to show transportation
  • 5.Long Shore Drift (LSD) draw a diagram in your notes. p. 149 in your text book. What processes shape our coastline?
  • TRANSPORTATION Long Shore Drift (LSD) • Waves approach the _____ at an angle due to the direction of the ____. The ______ carry material up the beach at the same angle (due to the wind) and then down at 90º to the beach (due to the pull of______). This means ______ is carried along the beach in a zig zag pattern. waves wind material coast gravity
  • Diagram of Long Shore Drift (LSD) What processes shape our coastline?
  • C. Coastal Deposition What causes deposition to take place? 1. Slower flowing water 2. Sediment can no longer be carried; either too heavy or meets an obstacle 3. Wave loses energy in a bay where there is more shelter and less wind. This allows a beach to form. What processes shape our coastline?
  • Map skills recap:p153 What features should you be able to recognise on a map? • Camp site • Coniferous forest • Visitor centre • Foot paths • Schools • Different types of roads • Train station • And many more….. • Make yourself a key to ensure you will remember them. What are the patterns on this map shown by the contours? • Reference specific grid squares and numbers. • Describe the relief of the land. What processes shape our coastline?