Coast and waves

Lesson Objectives Lesson 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.

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Transcript of Coast and waves

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.

What is the definition of a coastline?

The coast – a narrow zone where land, sea and atmosphere meet

Three zones of the coast

Parts of a wave

Swash and Backwash!

Swash

Backwash

Constructive WavesSwash

Backwash

Material deposited on beach

Destructive Waves

Swash

Backwash

Material eroded off beach

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

Constructive Waves

Destructive Waves

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

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.

Waves and wind batter the coast. In some places the waves erode the land along the coast. This high cliff has rocks that have tumbled down.

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