Summary
Summary Sources of energy in coastal environments: wind, waves (constructive and destructive), currents and tides
- Module
- Systems and processes
- Institution
- AQA
3.1.3.2 Systems and processes
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Sources of energy in a coastalsystem
- Wind
- Waves
- Tides
- sea currents
Wind
Waves created by transfer of energy from wind blowing over sea surface (friction drag of the wind)
Abrasion – most common type of wind erosion
Waves
Oscillatory waves – wave in open sea with full circular motion of particles
Translatory waves – a breaking wave in which the circular motion has been broken by basal friction
3 things that determine size of wave
- Strength of wind
- How long wind has been blowing for (longer blows = bigger wave)
- Fetch
SW England (eg Cornwall) - 2,500 miles fetch, larger waves
NE England – 500 miles fetch, smaller waves
Wave = superficial undulation of the water surface caused by winds blowing across the water
surface
Undulation – action of moving up and down
Wave frequency n.o waves per minute
Wave period Time taken for 2 successive crests to pass a
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