…And Their Coastal margins

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Presentation transcript:

…And Their Coastal margins Question: What factors affect coastlines?

1. What am I?

2. What am I?

3. What am I?

4. What process does the diagram show?

5. What am I?

6. What am I?

7. What am I?

8. What is happening here?

9.How would you describe this?

10. What am I?

1. What feature am I? Wave cut platform

What type of coastal defence am I? Wooden Groyne

What feature am i? Sand dune

What process does the diagram show? Longshore drift

What two features am I? Spit and saltmarsh

What feature am I? stack

What feature am I? tombolo

What processes are shown here? Processes of erosion Attrition Hydraulic action/pressure Abrasion Corrosion

What type of beach is this? Shingle

What type of coastal defence am I? Rock armour

Factors affecting the coastline: The coast is an open system affected by many physical and human processes such as: Coastal processes – waves, erosion, transport and deposition Lithology: Geology properties (rock type) and Geological structure – concordant or discordant coastlines Sea level changes Human impacts Ecosystem type

#1 – How does wave type affects the coastline?

HOW FETCHING! The size of a wave depends on Fetch - the distance a wave travels. The greater the fetch, the larger the wave. Wind - effect on the size of waves. The stronger the wind the larger the wave.

Type of wave……. Constructive or low energy waves http://www.youtube.com/watch?feature=player_embedded&v=EpFykGLsDnM Constructive or low energy waves Associated with calm weather. Are less powerful waves. Break on the shore and tend to deposit material. Are responsible for transporting material. Swash is stronger than the backwash. http://www.youtube.com/watch?v=FHvAxYrHdDU&feature=player_embedded Destructive or high energy waves Associated with storm conditions. Are created when wave energy is high and there is a large fetch. Tend to remove material from the coast and are therefore associated with erosion. Backwash is stronger than the swash

Waves Type of wave can determine shape of the beach: Constructive waves produce deposition and therefore shallow beaches Destructive waves produce erosion and therefore steeper gradients (beaches)

Define & Draw Swash, Backwash and Longshore Drift

Pg. 153-155 Find a diagram and describe a constructive wave (swell wave) Find a diagram and describe a destructive wave (storm wave) Define swash and backwash Define wave refraction and label a diagram to show this process Define longshore drift What causes the tides? How does the tide affect coastal processes?