Barton on Sea

Just some information on the effects of flooding on Barton on Sea.

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  • Created by: JamesMck
  • Created on: 01-06-11 13:43

Background

  • Located on the South coast of England, in the county of Hampshire
  • More specifically, it's situated in Christchurch bay
  • Due to its location, it is affected by the South Westerly wind 
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Why is Barton on Sea being protected?

  • The benefit gained from protecting the coast is greater than the financial cost of building them

The following human activities are being protected:

  • Houses with high value
  • Major settlements
  • Historic buildings (churches and castles) 
  • Two links golf courses
  • A main 'A' road and a large scale railway
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Why is erosion so severe at Barton on Sea?

  • The construction of groynes from Bournemouth to Hengistbury Head has stopped long-shore drift therefore the beach at Barton on Sea has reduced in size
  • This consequently leads to the erosion from the waves powered by a 6000km fetch on the cliff itself.
  • The main reason for the rapid cliff retreat however is the rock structure of the cliff and the effect that sub-aerial processes have on it.
  • When it rains, the water infiltrates through the permeable sand and is absorbed by the porous clay. Overtime, the clay becomes saturated until a slip zone is created between the sand and the clay.
  • Because the pressure is too great, rotational slip occurs into the sea and the material is carried away by the sea exposing fresh rock and the process repeats itself.
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Strategies in place on the cliff to protect the pe

  • De-watering drainage system 
  • Regraded slopes 
  • Vegetation on the cliff face
  • Perforated drainage pipe drains
  • Interlocking sheet piles 
  • Fan-shaped drains
  • Revetment 
  • Rock armour
  • Wooden groynes

Together these strategies help to: stabalise the cliff face, help filter the water, lessens marine erosion, lowers the effects of gravity on slumping.

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Coastal Management Strategies that would help

  • Using a de-watering drainage system inland due to the large volumes of precipitation
  • Regrading the slops to lessen the slumping effect
  • Use lots of vegetation to keept the cliff face stable
  • Use rip rap to reduce the power of the waves
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Comments

lucas

Page 6 was my fovourite :P

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