Erosional coastline: Holderness
- Created by: charlottedavey
- Created on: 12-05-15 18:19
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- Erosional coastline: Holderness
- Problem
- Made of soft material called boulder clay
- Sand and clay deposited during ice age
- Frequently attacked by strong winds-causing cliffs to erode
- 4km gone since Roman times
- 1.2m a year-highest in Europe
- Made of soft material called boulder clay
- Causes
- Wind
- Waves cross a long fetch which increases wave energy for erosion
- Problems protecting 50km coastline
- Strong waves
- Caused by strong winds blowing across North sea
- Destructive power may be increasing due to global warming
- Main source of erosion is hydraulic power and abrasion
- Eroded material
- Fine clay which is mostly carried out to sea
- 1.5 million tonnes of clay carried out each year to sea
- Rest of eroded material is a type of heavier sand which eventually settles to form a thin beach
- Constantly moving south at a rate of about 0.5 million tonnes per year
- Constantly moving south at a rate of about 0.5 million tonnes per year
- Rest of eroded material is a type of heavier sand which eventually settles to form a thin beach
- Wind
- Effects
- North Sea gas terminal under threat
- Towns, farms, roads, caravan sites under threat
- Managment
- Wave resistant structures
- Sea walls
- Revetments
- Groynes
- Trap beach material
- Colliery waste
- Dumped 50km off coast
- Series of banks designed to refract waves
- Dumped 50km off coast
- Tyres
- Bank of 1.5 million tyres are submerged
- Wave resistant structures
- Has management worked?
- Mappleton erosion has increased by 10m a year
- Due to southward movement of protective sand being blocked
- Study at Hull Univeristy recommened no further intervention
- Some more villages have been protected by sea walls
- Mappleton erosion has increased by 10m a year
- Problem
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