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Lesson 4: How does erosion effect people living on the coast?


Title: Lesson 4: How does erosion effect people living on the coast? Author: Ellie Last modified by: LeaD Created Date: 2/14/2010 6:45:26 PM Document presentation format – PowerPoint PPT presentation

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Title: Lesson 4: How does erosion effect people living on the coast?

Lesson 4 How does erosion effect people living
on the coast?
  • Lesson Objective
  • To know the factors affecting cliff retreat and
    explain the effects on people

See, Think, Wonder
I can see
I think
I wonder
Residents Tourists Conservationists Government Local Authorities Coastal protection agencies
Residents Preserve homes and jobs
Tourists Want access to coast with no restrictions
Conservationists Preserve local habitats and protect wildlife
Government Has to consider actions from place to place. Use public money to benefit the majority
Local Authorities Look after interests of as many people as possible
Coastal Protection Agencies Choose the most vulnerable places coastal management is very expensive.
This is a conflict matrix? fill in the rest of
the blank boxes. I have done the easy ones for
Why do cliffs collapse?
  • There are several reasons why cliffs collapse
  • Marine processes? cliff bases eroded by hydraulic
    action and abrasion steeper cliff
  • Weathering weakens rocks
  • Heavy rain saturates permeable rock at the top.
    May also erode cliff faces as it goes down
  • Water flows through permeable rock adding to the
    weight of the cliff
  • Human actions? buildings add to the weight which
    can push down onto a weak cliff.

Christchurch Bay
  • Christchurch Bay is located on the UKs South
    Coast. It has a severe erosion problem. It needs
    management to stop the cliffs eroding over 2
    meters a year
  • Barton-on-Sea is part of Christchurch Bay. Mass
    movement here is the major problem
  • Christchurch Bay is prone to erosion as it has a
    3000 mile fetch across the Atlantic Ocean.

Impacts on Christchurch Bay
  • Homeowners could loose their homes to the sea.
    House value will decrease dramatically and
    insurance may not be given
  • Dangerous conditions in terms of falling rocks
    and unpredictable slumping
  • Sometimes roads and infrastructure are destroyed
  • Area becomes unattractive and tourism may
    decrease leading to economic impacts
  • SOLUTION??? Sea defences- but they are expensive
    and some people dont think its worth it

(No Transcript)
People and Coastal Retreat
  • Read page 76-77 of your text book
  • Complete Activity 2 and 3 in your book
  • Extension? complete skills builder 5

Holderness Case Study
  • Where is Holderness located?
  • Describe what Holderness is like
  • What makes Holderness prone to erosion?
  • What are the options available to people in
  • What has already been lost in Holderness?
  • Read the opinions on coastal management- put them
    into an order of Strongly for and strongly
    against coastal management
  • What are the costs and benefits to managing the
  • What do you think they should do?

  • Share your ideas for what should happen to
    Holderness- try and get a mini-debate going!
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