What has caused this Coastal Erosion This lesson I will be able to explain the factors that cause cliff erosion Literacy focus contributing in class discussion Target D and below Target ID: 420129
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Slide1
What has happened here?
What has caused this?Slide2
Coastal Erosion
This lesson I will be able to:
explain the factors that cause cliff erosion.
Literacy
focus
: contributing in class discussion.
Target
D and below
Target
C-B
Target
A – A*
Will be able to describe some factors
that cause coastal erosion.
Will be able to explain
the factors that lead to coastal erosion.
Will be
able to apply their knowledge of coastal erosion to a case study of North Norfolk.Slide3
What factors cause cliff erosion?
Geology (rock type
)
The fetchWave action (destructive waves on steep beaches lead to coastal erosion)Mass movements (cliffs that are gentle and well vegetated will be more resistant to mass movements).Slide4
1. Geology
What
are the
two strongest and two
weakest
rocks
?Slide5
High resistance to erosion
Low resistance to erosion
Using this information, can you explain why the type of rock can affect the rate of coastal erosion?Slide6
2. Wave Action and the Fetch
Waves are the main agents of coastal erosion. The longer wind blows over open water, the longer the fetch, the stronger the wind, the more powerful the wave.Slide7
2. Wave Action and the Fetch
Using the diagrams, would the north-east or south-west of England experience the strongest waves? Can you explain your answer?Slide8
Case Study: the North Norfolk CoastlineSlide9
Where is Norfolk?
What do you notice about it?Slide10
Remember that
coastal erosion
is where the land is worn away by the action of the sea.Slide11
Why is the North Norfolk coast retreating so fast?
1. The cliffs are made of
soft rocks
, mostly
sandstone
and clay.
Glacial Till
Clay
SandstoneSlide12
Why is the North Norfolk coast retreating so fast?
2. The coast is very
exposed
and
the
waves have a long fetch over the north sea.Slide13
LSD: WEST to EAST
Why is the North Norfolk coast retreating so fast?
3. The material that does erode from the cliff is quickly
washed away
west-east through
longshore drift.
LSDSlide14
So… who is effected by coastal erosion?Slide15
Meet Cliff
H
ouse
T
ea Shop owner Diana Wrighton...
She is one of the many people effected by coastal erosionSlide16
How are the following people effected by coastal erosion?
Farmer
Hotel Owner
Insurance Worker
Elderly ResidentSlide17
“I have lost valuable land which means fewer crops. I have received no compensation. It’s not my fault the coast is eroding – I have a family to feed.”
Crop
farmer
“Is it my fault the sea is eroding? No. So when I run out of space for my cattle is it fair that my income goes down?”
Livestock farmer
“I have lived here all my life. The community means a lot to me and we are losing houses at a rate of one every year.”Local elderly resident“I’m only here for a few weeks a year but each time I arrive there is less and less of the cliffs and its harder and harder to get down to the beach. The enjoyment is reduced each time I return.”
Tourist
“Everyone is so worked up about the erosion, but there are worse places. I didn’t have a problem getting a house or a mortgage, and jobs are easy to come by’’
Local residentSlide18
“
My whole business relies on a cliff top view and easy access to the beach. Each year as the cliff retreats I lose land. Each year as access to the beach is made more difficult my customers are less happy. I cannot afford to buy more land to create space for more plots.”
Caravan and camp site
owner
“My income relies on the summer. I need tourists who need sun, sand and a safe beach. If they are not there I don’t have an income.”
Ice-cream seller“My surgery is full of people reporting from stress, sleeplessness and depression. I am concerned that with people constantly moving away, my job may be at risk’’Local GP
“It is impossible to insure my property against erosion, I cannot sell it, so I presume when my house falls into the sea I will be homeless’’
Local
residentSlide19
E
xplain the effects of coastal erosion on people (6).
Grade C: Describes at least one effect of erosion.
Grade B: Names a located example. Describes at least two effects of erosion.
Grade A: Explains how people are effected using phrases such as ‘this means that’.Grade A*: Names specific groups of people and fully explains how coastal erosion effects them.