110485
Description
Mind Map by danthomas1, updated more than 1 year ago
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Created by danthomas1
over 11 years ago
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Case Study: Cliff Collapse - Holderness
- Why is Holderness under threat?
- Geology
- Most of the cliff is made up of glacial
till, which is very susceptible to
erosion.
- Most of the cliff is made up of glacial
till, which is very susceptible to
erosion.
- Fetch
- The waves come from a NE
direction and have a long
distance in which to build up
energy.
- The waves come from a NE
direction and have a long
distance in which to build up
energy.
- Narrow Beaches
- The narrow beaches of
Holderness don't protect the
coastline from erosion
because there're narrow
beaches that don't absorb
much wave energy
- The narrow beaches of
Holderness don't protect the
coastline from erosion
because there're narrow
beaches that don't absorb
much wave energy
- Geology
- Rate of Erosion
- Average 2m/year
- Up to 20m if a particular area has been experiencing lots of storms
- Average 2m/year
- Mappleton
- Small coastal town
- Many locals work in the agricultural industry
- Issues
- B1242 too close to the edge of the cliff
(within 50m in some areas)
- Farmers forced to move their cattle from the
cliff edges - affects their livelihood
- (1996) Sue Earl (a local person) was forced to move out of her house
due to it becoming within 4m of the cliff edge. She has since
sued the council for compensation.
- B1242 too close to the edge of the cliff
(within 50m in some areas)
- Solutions
- in 1991 a Coastal Protection Plan was set up
- Groynes
- To build up the sand so that it protected the
base of cliffs, reducing erosion
- To build up the sand so that it protected the
base of cliffs, reducing erosion
- Rock armour
- Placed at the bottom of the cliff to
dissipate wave energy
- Placed at the bottom of the cliff to
dissipate wave energy
- £2 million
- Groynes
- in 1991 a Coastal Protection Plan was set up
- Subsequent issues created
- In some places the rate of erosion increased
- The beaches south of Mappleton were starved for sand & sediment
- Lack of sand & sediment at Spurn Head caused the lighthouse to be at risk
- Homes and businesses at more risk of being
affected by the retreat
- An important gas column which supplies 25% of the SW is 25m
from the edge.
- In some places the rate of erosion increased
- Small coastal town
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