How can cliff How can cliff collapse cause collapse cause problems for people problems for people at the coast?at the coast? http://www.soton.ac.uk/~imw/barteros.htm#headpage

Look at this geology map of Britain

• We are looking for places that you think will be the most vulnerable to cliff collapses?

• What makes a coastline more vulnerable to erosion?

• Locate Barton-on-Sea using the textbook as a guide.

These rocks are weaker and more easily eroded.

18th May 200829th May 20086th June 200821st June 200816th July 200826th January 2009

What is a cliff collapse?

• An element of coastal erosion

• Why are we studying it?– The effect that it can have on people (when

people live very close to the coastal zone)– The effect on the environment

A cliff collapse – how far do you think the cliff has lowered in this photograph?

What makes Barton-on-Sea so vulnerable to cliff collapses?

• Geology (as we have already demonstrated)

• Sand overlays clay in places• Sand is permeable, clay is impermeable.• How does this create problems?

• Fetch? (can we remember what this is?)

• Housing built close to the cliff• Problems for residents?• Interference with drainage

Why is the arrangement of the geology at Barton-Sea so important?

How would you draw diagrams 3 & 4?

Draw a diagram for 6th June 2008 (3.) and January 2009 (4.)

Reminder...some of the factors Reminder...some of the factors that can influence cliff that can influence cliff

collapse?collapse?F I L C F O L E G Y O G

C L I F F G E O L O G Y

V A H Y E L F I N A R L A

H E A V Y R A I N F A L L

Y E T P F O V E W A

T Y P E O F W A V E

H F C E T

F E T C H

Can you think of any others?