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OCR A Level Geography Coastal Landscapes Summary - 4a (Human activity intentionally causes change within coastal landscape systems - Sandbanks, Dorset & Goose Spit, Vancouver) $3.99
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OCR A Level Geography Coastal Landscapes Summary - 4a (Human activity intentionally causes change within coastal landscape systems - Sandbanks, Dorset & Goose Spit, Vancouver)
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  • Course
  • Coastal Landscapes
  • Institution
  • OCR
  • Book
  • OCR A Level Geography Second Edition

Summary of part 4a from Chapter 1 (Coastal Landscapes) of Michael Raw's OCR A Level Geography textbook which is linked to this document

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  • No
  • Chapter 1, 4a (human activity intentionally causes change within coastal landscape systems - sandban
  • August 4, 2022
  • 2
  • 2021/2022
  • Summary

Subjects

  • a levels
  • geography
  • a level geography
  • ocr
  • ocr geography
  • coastal landscapes
  • sandbanks
  • dorset
  • human activity
  • beach nourishment
  • rock groynes
  • goose spit
  • rip rap
  • sea wall
  • hold the line

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Written for

  • A/AS Level
  • OCR
  • Geography
  • Coastal Landscapes
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1.1. How are coastal landscapes developed?
 4a. Human activity intentionally causes change within coastal landscape systems (Sandbanks, Dorset &
Goose Spit, Vancouver)
Sandbanks, Dorset
What human management strategy is being implemented?
What human management strategy is being implemented?
 Coastal management = 11 rock groynes implemented in 2011 on the SE
 Coastal management = beach nourishment (2005/6) – natural buffer Peninsula made of local (cheaper) Portland limestone, located in front of The
 Soft management (AO2) Pavilion, on Sandbanks beach = hard structural management - very durable
material (3 – 6 tonnes) = highlights the high level of investment in SLM plan –
Why is it being implemented? so much investment due to Sandbanks high economic value

 To reduce rate of erosion (at Shore Road, the spit is only 50m wide & without Why is it being implemented?
management, erosion of land would occur at 1m/yr)
 If no management strategies are applied £18mill of damage to residential  To result in widened beaches (50m on average), disrupt flow of LSD & trap
properties will occur by 2040 sediment
 To reduce risk of flooding - parts of Sandbanks – Shore Road is only 2m above sea
level, this road is the only access point to Sandbanks area (high economic value) –
Intentional impacts:
flooding generally occurs during storm events but threats of sea level rise
increase the chance of this happening  Maintenance of the beach sediment store which is important for tourism &
 Prevailing winds coming from SW (Atlantic) – long fetch results in waves having because the beach is a natural buffer for wave energy = reducing the likelihood
lots of energy which cause higher rates of erosion & a greater chance of flooding of flooding
 The higher the wave energy the higher the risk of overtop

Intentional impacts: Unintentional impacts:
 The distal end of the spit is starved of sediment as groynes disrupt the flow of
 To increase beach sediment budget/store LSD, therefore causing the spit store to diminish in size - natural protection
 To widen the beach against wave energy is reduced
 To make it steeper (dissipates wave energy as waves have to travel over the  HOW DOES THE LANDFORM CHANGE? Steeper beach profile - reduces chance
beach) of flooding & loss of sediment
 HOW DOES THE LANDFORM CHANGE? Gradient of beach increases & full length
of the Pavilion beach was renourished
Consequence of this landform change:
Consequence of this landform change:
 Distal end of spit at risk of erosion from swell waves from cross channel ferries
 Additional beach sediment acted as a substrate (underlying layer) for pioneer  More rock groynes & rock armour at distal end - lots of investment
species e.g. marram grass colonised
 Roots of vegetation helped to stabilise the sediment = less susceptible to erosion
 Grasses would also trap sediment, further increasing the gradient of the beach –
further increasing the sediment in this store

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