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What processes cause beaches and spits to form in bays ?. Homework: due next lesson. Explain the process of longshore drift. You may use a diagram to help with your answer (4). Homework: from last lesson. What happened at Holbeck Hall? Why?

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homework due next lesson
Homework: due next lesson.

Explain the process of longshore drift. You may use a diagram to help with your answer (4)

homework from last lesson
Homework: from last lesson.

What happened at Holbeck Hall?

Why?

Peer assess another person’s work. Underline geographically specific vocabulary. How many words did they use?

sizeable portrait
Sizeable portrait

Coasts are a dynamic environment subject to constant shaping and reshaping by the actions of the waves.

In this lesson you will study the features created from material eroded by waves and consider their importance.

The lesson will continue preparation for the Swanage field visit.

coming up
Coming up
  • All pupils can explain the process of longshore drift
  • All pupils can identify the features created by longshore drift.
  • All pupils can explain the features created by longshore drift.
vocabulary
Vocabulary
  • Longshore drift
  • Bays
  • Shingle
  • sediment
slide7

What happens to the eroded material from the cliffs?

What type of wave deposits sediment?

why are beaches important extra can you classify the reasons as social environmental or economic

Why are beaches important?Extra: can you classify the reasons as social, environmental or economic?

Swanage Beach

slide10

What will happen to any buildings at the top of the cliff?

Is there anything to stop the sea from eroding the cliff?

slide11

How are beaches formed?

Beaches form in sheltered environments, such as bays. When the swash is stronger than the backwash, deposition occurs.

Sometimes sand from offshore bars can be blown onto the shore by strong winds.

In such cases dunes may form – such as at Studland on the Dorset Coast.

slide12
Task

Explain why beaches are important.

  • Beaches are important because………
slide14

In lesson 2 you learnt about Swash and Backwash

Backwash

Swash

If you tracked a pebble’s progress through swash and backwash where would it end up? Why?

slide15

How is sediment transported along the coast?

Can you predict what will happen when the animation is started?

slide16

Longshore drift

http://www.bbc.co.uk/learningzone/clips/3086.bb.wmv

Direction of movement

Backwash is always at right angles to the beach

swash

Backwash

This movement of sediment along the coastline is calledlongshore drift.

slide17
Task

Make an annotated copy of the diagram showing longshoredrift. The annotations should explain longshore drift.

Your annotations must include the following words:

  • Wave
  • Swash
  • Backwash
  • Constructive
  • Material

Backwash

slide18

Use the labels below to annotate a diagram showing how longshore drift occurs

Backwash moves the material back down the beach. Gravity means it is at right angles to the beach.

A constructive wave brings material to the beach

Another constructive wave pushes material back up the beach

The swash moves the material diagonally up the beach

Backwash

The process is continued meaning that the material “zigzags” along the beach

slide22

How are spits formed?

Can you predict what will happen?

slide23

Task

Produce a sequenced piece of writing to demonstrate how a spit is formed. Pages 78-79 may help.

slide25

What is a tombolo?

If a spit joins the mainland to an island it is called a tombolo.

At Chesil Beach in Dorset, the mainland is joined to the Isle of Portland.

slide26

Chesil Beach

Study the photograph.

Y

X

Portland

From what direction was the photograph taken?

Name features X and Y.

slide27

What is a bar?

If a spit joins one part of the mainland to another it is called a bar.

For example, there is a bar at Orford Ness in Devon.

slide28

Task

Explain what a spit and tombola is.

homework due next lesson1
Homework: due next lesson.

Explain the process of longshore drift. You may use a diagram to help with your answer (4)