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# Coast and waves

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### Coast and waves

1. 1. Lesson ObjectivesLesson Objectives This lesson is looking at the different types of wave you can get and how they effect the coast differently. By the end of the lesson you should be able to: • Define the coast . • Differentiate between three zones of the coast. • Name the two types of wave. • Describe the differences between them • Explain how they change the coastline in different ways.
2. 2. What is the definition of a coastline?
3. 3. The coast – a narrow zone where land, sea and atmosphere meet
4. 4. Three zones of the coast
5. 5. Parts of a wave
6. 6. Swash and Backwash! Swash Backwash
7. 7. Constructive Waves Swash Backwash Material deposited on beach
8. 8. Destructive Waves Swash Backwash Material eroded off beach
9. 9. Destructive waves mean steep, stepped beach caused by waves pulling sediment off the beach Constructive waves mean wide, flat and usually sandy beaches as waves deposit sediment on the beach
10. 10. Constructive Waves Destructive Waves
11. 11. Constructive and Destructive WavesConstructive and Destructive Waves ConstructiveConstructive • Height = Low (less than 1 metre) • Length = Long • Frequency = Fewer than 10 a minute • Energy = Low • Beach gradient = flat • Main process = deposition • Stronger swash DestructiveDestructive • Height = High (more than 1 metre) • Length = Short • Frequency = More than 10 a minute • Energy = High • Beach gradient = steep • Main process = erosion • Stronger backwash
12. 12. Key WordsKey Words Fetch – the distance a wave has travelled Swash – the forward movement of a wave up the beach after the wave has broken Backwash – water from a breaking wave which flows under gravity down the beach Constructive Wave – deposits sediment, building up the beach Destructive Wave – a wave that removes sediment from the beach, eroding it.