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Wave refraction

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• Wave refraction

1. 1. Wave refraction
2. 2. By the end of this lesson,you will be able to... 1. Describe how waves approach a coast with headlands and bays. 2. Explain how wave refraction happens 3. Explain how wave refraction results in erosional and depositional features.
3. 3. If you see these.... Think of the possible Add these answers first before information into checking the answer in pg 9 of your the next slide handout
4. 4. Wave refraction
5. 5. What is refraction?Wave refraction
6. 6. Remember what is light refraction? You’ve learnt it in Sec 1 / 2 science remember?
7. 7. When Light enters aglass block...
8. 8. It bends and refracts!When Light enters aglass block...
9. 9. It bends and refracts!When Light enters aglass block... Why did it refract?
10. 10. When Light enters aglass block...
11. 11. When Light enters aglass block... It slows down
12. 12. When Light enters aglass block... It slows down Therefore it bends and refracts
13. 13. When Light When it enters a exits theglass block... glass block It slows down Therefore it bends and refracts
14. 14. When Light When it enters a exits theglass block... glass block It speeds up It slows again. down Therefore it bends and refracts
15. 15. When Light When it enters a exits theglass block... glass block It speeds up It slows again. down Therefore it bends back Therefore it to its bends and original refracts angle.
16. 16. So, what is refraction? Change in direction / bending due to changes in speed.
17. 17. So, what is refraction? Change in direction / bending due to changes in speed. What is wave refraction then? Think and write it into your notes (Pg 9)
18. 18. How does waverefraction occur?
19. 19. How do the waves travel when the coastline is straight?
20. 20. How do the waves travel when the coastline is straight?AlmostParallelManner
21. 21. How do the waves travel at headlands and bay?
22. 22. How do the waves travel at headlands and bay? Away from the headlands, the waves are almost parallel to each other.
23. 23. How do the waves travel at headlands and bay? As it approach the headlands, it begins to bend. Away from the headlands, the waves are almost parallel to each other.
24. 24. How do the waves travel at headlands and bay? As it Bends approach towards the the headlands,headlands, it begins to bends bend.away from from the Away from sea the headlands, the waves are almost parallel to each other.
25. 25. How do the waves travel at headlands and bay? As it Bends approach towards the the headlands,headlands, it begins to bends bend.away from from the Away from sea the headlands, the waves are almost parallel to each other.
26. 26. How do the waves travel at headlands and bay? As it Bends approach towards the the headlands,headlands, it begins to bends bend.away from from the Away from sea the headlands, the waves are almost Wave Refraction parallel to occurred? each other.
27. 27. How didWave refraction occur? why do waves refract?
28. 28. ???? ??? Land Legend (Label it yourself Wave please) Crest ??? ??? (Label it yourself(Label it yourself please) please) Sea
29. 29. Change in direction / bending due to changes in speed.Wave refraction
30. 30. Where is the change in speed?How is the speed changed?
31. 31. Where is the change in speed?How is the speed changed? Parallel = Same Speed
32. 32. Where is the change in speed? How is the speed changed? SlowSlow DownDown Parallel = Same Speed
33. 33. Where is the change in speed? How is the speed changed? Speed remains SlowSlow DownDown Parallel = Same Speed
34. 34. Where is the change in speed? How is the speed changed? Speed remains SlowSlow DownDown Parallel = Same Speed Can’t Imagine how?
35. 35. What could have changed the speed of the waves? Speed remains SlowSlow DownDown
36. 36. What could have changed the speed of the waves? Friction with the Seabed Speed remains SlowSlow DownDown
37. 37. What could have changed the speed of the waves? Friction with the Seabed Less friction More Morefriction friction Speed remains SlowSlow DownDown
38. 38. What does this indicate about the depth of the water in front of the headlands and bays? Less friction More Morefriction friction Speed remains SlowSlow DownDown
39. 39. What does this indicate about the depth of the water in front of the headlands and bays? DeeperShallower Shallower Less friction More More friction friction Speed remains Slow Slow Down Down
40. 40. Let’s put this into a paragraph to explain how wave refraction happens Near Near Bayheadland Deeper Shallower Less friction More Approaching friction Speed Waves remains Same depth Slow Down Parallel = Same Speed
41. 41. Let’s put this into a paragraph to explain how wave refraction happens 1) As the waves approach the coast, they travel in a straight line, parallel to each other, as they travel in the same speed. Nearheadland Approaching Shallower Near Bay Waves Deeper Same depth More Less friction friction Parallel Speed = Same Slow Speed remains Down
42. 42. Let’s put this into a paragraph to explain how wave refraction happens 1) As the waves approach the coast, they travel in a 2) However, as the front of straight line, parallel to the headland is shallower each other, as they travel in than the front of the bay, the same speed. the waves encounter more Near friction and it slows down.headland Shallower Near Bay Deeper More Less friction friction Speed Slow remains Down
43. 43. Let’s put this into a paragraph to explain how wave refraction happens 1) As the waves approach the coast, they travel in a 2) However, as the front of straight line, parallel to the headland is shallowereach other, as they travel in than the front of the bay, the same speed. the waves encounter more friction and it slows down. Near Bay Deeper 3) As the front of the bay is deeper than the front of Less the headland, the waves friction encounter less friction and its speed remains. Speed remains
44. 44. Let’s put this into a paragraph to explain how wave refraction happens 1) As the waves approach the coast, they travel in a 2) However, as the front of straight line, parallel to the headland is shallowereach other, as they travel in than the front of the bay, the same speed. the waves encounter more friction and it slows down.4) This cause the wave to 3) As the front of the bay is refract, where the waves deeper than the front of bend towards the the headland, the wavesheadlands and bends away encounter less friction and at the bay. its speed remains.
45. 45. ???? ??? Land Legend (Label it yourself Wave please) Crest ??? ??? (Label it yourself(Label it yourself please) please) Can we improve diagram this ? To ma explana ke theSea tion cle arer?
46. 46. ???? ??? Land Legend (Label it yourself Wave please) Crest ??? ??? (Label it yourself (Label it yourself please) please) Sea ??? ??? ??? (Annotate it (Annotate ityourself please) (Annotate it yourself please) yourself please)
47. 47. By now you should be ableto 1. Describe how waves approach a coast with headlands and bays. 2. Explain how wave refraction happens
48. 48. Push your understanding further...Wave refraction How does it affect the energy?
49. 49. Land If the waves were to bend towards the headland, willSea the energy become more or less concentrated?
50. 50. If the waves were to bendLand away at the bay will the energy become more or less concentrated? If the waves were to bend towards the headland, willSea the energy become more or less concentrated?
51. 51. Because of how wave refraction changes the energy of the waves at the headlands and the bays,
52. 52. Because of how wave refraction changes the energy of the waves at the headlands and the bays, What kind of features will you see at headlands?
53. 53. Because of how wave refraction changes the energy of the waves at the headlands and the bays, What kind of features will you see at headlands? What kind of features will you see at bays?
54. 54. end of lesson