3.2 - Coastal systems Flashcards Preview

A-Level Geography - Coastal; systems and landscapes > 3.2 - Coastal systems > Flashcards

Flashcards in 3.2 - Coastal systems Deck (15)
Loading flashcards...
1

What created wind?

High and low pressure

2

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

3

Why do waves break?

Circular orbit - approach shore so friction
Elliptical orbit - top breaks (translatory wave)

4

What influences energy of waves? (3)

Strength - determined by pressure gradient
Duration -- longer = powerful
Fetch

5

Define prevailing winds

Most common wind direction

6

3 characteristics of high energy coasts

Strong waves
Headland, cliff, WCP
High rate of erosion and transportation

7

3 characteristics of low energy coasts

High rate of deposition
Beach, spit
Sheltered area

8

What causes tides?

The gravitational pull of the sun and moon

9

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

10

What causes a spring tide?
What is it?

A new or full moon. Has the highest and lowest tides

11

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

12

What is the case study for a storm surge?

2013 UK - Yorkshire

13

Stats for the 2013 UK storm surge

2 deaths
100mph + winds
£100 million in damage
19ft above sea level in Hull

14

What type of tides caused the 2013 storm surge?

Spring tides

15

What causes storm surges

An intense area of low pressure is over the sea, causing the tide to be higher. This creates a pressure wave and travels inland due to strong winds