L1 ap lyme regis cliff collapse
20
Case Study: Causes and impacts of cliff collapse at Lyme Regis
Transcript of L1 ap lyme regis cliff collapse
Case Study:Causes and impacts of cliff collapse
at Lyme Regis
Location – on the South Coast of England
LO: Case Study: Causes and impacts of cliff collapse at Lyme Regis
This is the town of Lyme Regis on the Jurassic Coast
• The Jurassic Coast is a natural World Heritage Site and is internationally important for its rocks, fossils and coastal landforms.
• Erosion is a very important process for maintaining the natural beauty of the coastline and ensuring that fossils and fresh geological exposures help scientists study the coastline.
Background Information
LO: Case Study: Causes and impacts of cliff collapse at Lyme Regis
Lyme Regis is home to over 3600 people and a popular tourist destination
East Cliff proposed Coastal Defence works
May 08 Landslide, 400m wide
Black Ven LandslideIs Lyme Regis slipping into the Sea?
The Jurassic Coast is a dynamic coast
May 7th 2008
About 400m of the coast fell into the sea in a dramatic landslide!
400m
The unprotected sea cliff retreats at rates of around 0.2-0.3m/year
A. Causes of Cliff Collapse at Lyme Regis
• They fall into a number of categories:1. Physical factors:a) Seab) Geologyc) Weather
2. Human factors
LO: Case Study: Causes and impacts of cliff collapse at Lyme Regis
1. Sea • More severe and frequent winter storms•Waves from the south west are powerful due to the large fetch, travelling from over 7000 miles. •Sea levels are rising•What does all this mean?•Waves attack the base of the cliffs and cause erosion speeding up the rate of land slides in the area
LO: Case Study: Causes and impacts of cliff collapse at Lyme Regis
2. Geology
• The town is built on a layer of strong limestone which is very solid. On top of that layer there are slippery muds, clays and sands
• What does this mean?• The clays, muds and sand slide over the limestone
layer to form the landslides.
LO: Case Study: Causes and impacts of cliff collapse at Lyme Regis
3. Weather
Why does more rain mean more landslides?The rain lubricates the movement of slippery clays, sands and muds and old underground streams are re-activated.
LO: Case Study: Causes and impacts of cliff collapse at Lyme Regis
4. Human InfluenceHow can humans make the situation worse?• Buildings add weight to unstable cliffs – in fact
much of the town has been built on pre-existing landslides!
• Impermeable surfaces e.g. car parks and roads interfere with the drainage of the cliffs
• Annotate your diagram to explain the physical and human causes of landslides at Lyme Regis
B. Impact of cliff collapse in Lyme Regis
People’s lives Environment
Beach chalets and 2 articles on showbie
It’s not all bad!• Erosion is a very important process
for maintaining the natural beauty of the coastline and ensuring fossils and fresh geological exposures to help scientists study the coastline!!
LO: Case Study: Causes and impacts of cliff collapse at Lyme Regis
Storyboard
Create a storyboard about cliff collapse in Lyme Regis: • Explain the causes of cliff collapse – physical and
human. • Describe the impacts of cliff collapse - people and
environment
LO: Case Study: Causes and impacts of cliff collapse at Lyme Regis
Using a case study, describe the effects of cliff collapse on people’s lives and the environment.
LO: Case Study: Causes and impacts of cliff collapse at Lyme Regis
