Mappleton - Human Activity Flashcards
Where is Mappleton located?
Holderness Coast of East Yorkshire.
Why is Mappleton subject to erosion?
Glacial till cliffs - weak structure.
Narrow beaches unable to stop erosion.
Long fetch - prevailing wind (north easterly)
High tidal range.
What was a threat upon Mappleton?
In 1990, erosion was extremely bad.
It posed threat on 30 houses and its main road.
What happened in 1991?
A scheme was made in order to protect village and main road.
How much is the Holderness eroding?
7- 10 m per year on average.
How much was the scheme at Mappleton?
£2 million .
What did the Mappleton scheme comprise of?
2 large rock groynes.
Large granite revetment.
Dune regeneration.
Planting vegetation - cliff stabilisation.
What were the rock groynes job?
Trap materials that were carried in waves during longshore drift.
What were the revetments job?
Placed like a wall 450m line of defence along shoreline.
Absorbed waves.
Negatives and positives about the revetments?
Expensive.
Imported from Scandinavia.
Long lasting.
What did the dune regeneration/ planting of vegetation do?
Further stabilise cliff from mass movement.
NEGATIVE IMPACTS of the scheme at Mappleton?
LSD no longer transports material along this section of coast putting village south of Mappleton at risk of erosion.
Materials here aren’t replenished as its trapped at Mappleton.
As a result the beaches to the south have very liitte sediment, low tide the area is exposed to erosion.
POSITIVE IMPACTS of the scheme at Mappleton?
Rock groynes created large, high sandy beach for Mappleton, waves even at high tide do not reach base of cliff - erosion slowed down.
Rock armour effective at protecting south of Mappleton.- stopped waves attacking base of cliff.
Cliff stabilisation stopped mass movement.
No properties lost to sea.
Main road remains safe from erosion.
Overall what has happened at Mappleton?
Increased erosion and slumping.
Because it is predominately agriculture here a number of farmers have lost land to erosion.
Several farms completely lost to sea eg Grange Farm.
Conclusion.
Humans only occupy a small amount of the worlds coastline so would conclude that nature is the bigger influence of shaping the coastline on a global basis.
