1. The Coastal Zone New topic!

2. Waves A wave is a bulge of water which moves across the surface of the sea. As they move towards the shore they grow and break.

3. Learning objectives To explain how waves form. To identify the differences between constructive and destructive waves.

4. Waves are responsible for the shaping of the coastline

5. Globally, one ship is lost at sea every week!

6. Constructive Waves (these waves build the beach) Destructive Waves (these waves remove the beach) There are two types of waves:

7. SWASH BACKWASH Key processes…

8. Constructive or destructive waves? Constructive Constructed a big sandy beach Strong, long swash No signs of erosionWeak backwash

9. Constructive or destructive waves? Destructive Small beach, little construction going on Strong powerful backwash Major sign of erosion – destruction of the cliffs Weak swash

10. You have a series of tasks through which you should work: ALL of you need to complete: Types of waves and diagrams Destructive/constructive comparison table How do waves form questions and map MOST of you should complete: Waves and tides gap fill SOME of you should complete: Key terms list Extension task on surfing

11. Which parts of the UK receives the biggest and most frequent waves? Prevailing winds (from SW) The prevailing winds to the UK travel across the same distance as the largest fetch Largest fetch Why is surfing better in Devon and Cornwall then it is in Norfolk and Suffolk?

12. 1 2 3 The length of water the wind blows over is called the fetch! The larger the FETCH, the bigger the wave! The North Sea – which wave will be larger?

13. 5 hours 10 hours 2 hours The amount of TIME the wind blows for The longer time the wind blows for, the bigger the wave! The North Sea – which wave will be larger?

14. 80 MPH winds 60 MPH winds 40 MPH winds The STRENGTH of the wind The stronger the wind, the bigger the wave! The North Sea – which wave will be larger?