Flashcards in 3.2 - Coastal systems Deck (15)
What created wind?
High and low pressure
How is energy transferred from wind to sea?
Wind blows over surface - frictional drag - energy transfers to water - ripples - wind increases strength and ripples get bigger
Why do waves break?
Circular orbit - approach shore so friction
Elliptical orbit - top breaks (translatory wave)
What influences energy of waves? (3)
Strength - determined by pressure gradient
Duration -- longer = powerful
Define prevailing winds
Most common wind direction
3 characteristics of high energy coasts
Headland, cliff, WCP
High rate of erosion and transportation
3 characteristics of low energy coasts
High rate of deposition
What causes tides?
The gravitational pull of the sun and moon
What causes a high tide?
The beach is directly facing / away from the moon. The tidal force is strongest on the side facing the moon, causing the Earth to bulge
What causes a spring tide?
What is it?
A new or full moon. Has the highest and lowest tides
What causes a neap tide?
What is it?
Moon is at a right angle to Earth so the pull of the sun / moon is weak. Causes low low and high high tides
What is the case study for a storm surge?
2013 UK - Yorkshire
Stats for the 2013 UK storm surge
100mph + winds
£100 million in damage
19ft above sea level in Hull
What type of tides caused the 2013 storm surge?