Marine process

 Topic 10: Marine process

Characteristics of the waves

CONSTRUCTIVE DESTRUCTIVE - DESTRUCTIVE

- Longer wave length - Shorter wave length

- Builds the coast line - Erodes the coast

- Lower wave height - Higher wave height

- Wave are flatter - Waves are steeper. etc.

- More deposition than erosion - More erosion than deposition

- Stronger Swash and Weaker

Backwash

- Stronger backwash and Weaker

Swash

- Lower frequency : 6 – 8 per minute - Higher frequency: 12 – 14 per minute

Name and describe the erosional processes of wave action such as corrasion, hydraulic action, corrosion and attrition

Hydraulic Action / Pressure:

• When waves smashes against a rock, the force of the water compresses air trapped in crack of the rock- enlarges a weakness in the rock.

Corrasion / Abrasion

• Materials such as sand and stones carried by waves is used to scour and scrape rocks in the way.

Attrition

• The material carried by the waves grind down other materials in the wave Corrosion/Solution.

• Seawater may contain acids such as carbonic acid – that dissolves rocks like limestone and chalk.

Activity

Name and explain the process taking place in the diagram below.

Look at how erosional process is taking place

Conclusion

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