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OCR A Level Geography Coastal Landscapes Summary - 1c (Coastal sediment is supplied from a variety of sources) $3.97
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OCR A Level Geography Coastal Landscapes Summary - 1c (Coastal sediment is supplied from a variety of sources)
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  • Course
  • Coastal Landscapes
  • Institution
  • OCR
  • Book
  • OCR A Level Geography Second Edition

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

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Document information

  • No
  • Chapter 1, 1c
  • August 4, 2022
  • 1
  • 2021/2022
  • Summary

Subjects

  • a level
  • geography
  • a level geography
  • geography a level
  • coastal landscapes
  • ocr
  • year 12
  • year 13
  • sediment sources
  • human
  • terrestrial
  • offshore

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Written for

  • A/AS Level
  • OCR
  • Geography
  • Coastal Landscapes
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1.1. How can coastal landscapes be viewed as systems?
 1c. Coastal sediment is supplied from a variety of sources

Various sources of coastal sediment: Human

Terrestrial  In order to achieve sediment equilibrium beach
nourishment is used as a human management
Sediment budget = the balance of the sediment volume entering and exiting a particular technique to restore this
section of the coast  However, wind, waves and LSD movements can
 Rivers are major sources of sediment input to the coastal sediment budget (90% of remove sediment from the beach
all sediment comes from there), especially steep gradient coastlines (fluvial  By doing: amount of sediment gained – amount
deposition) – directly deposit sediment at coast of sediment lost = it can be determined if the
 This sediment originates from erosion of inland areas by water, wind and ice & sub- sediment budget is in surplus, deficit or
aerial processes – weathering & mass movement equilibrium
 Marine/wave erosion is a source of large amounts of sediment which contribute to
coastal sediment budgets
 Such as cliff erosion (mass movement) - can increase due to rising sea levels,
contributes up to 70% of overall material supplied to beaches
 Aeolian deposition also contributes largely to coastal sediment, sediment is blown
and travels large distances, deposited on the coast
 LSD also supplies sediment from one coastal area by moving it along the coast to
adjacent areas


Offshore
 Marine deposition – constructive waves, tides & currents bring sediment to the
shore from offshore locations & deposit it adding to sediment budget
 Wind transports fine sediment e.g. from exposed sand bars/dunes to other locations
on the coast, as it has less energy than wave energy so cannot transport very large
particles

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