Coastal Management Options

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Sea Wall

•' A long concrete barrier built at the base of a cliff offshore

Advantages

  • protects the base of the cliff against erosion - made of resistant concrete
  • land and buildings behind it are protected

Disadvantages

  • expensive to build and maintain
  • restricts access to the beach
  • looks ugly

Hard/Soft?

  • hard enginneering
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Groynes

  • Wooden, rock or concrete 'fences' built across the beach, perpendicular to the coastline

Advantages

  • prevent the movement by longshore drift of beach movement along the coast
  • the beach can build up as a natural defence against erosion
  • attraction for tourists

Disadvantages

  • ugly
  • don't last very long as wood rots

Hard/Soft?

  • hard enginneering
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Gabions

  • Large steel / stainless steel mesh cages that are filled with rocks.

Advantages

  • At right angles to the coastline
  • if made of stainless steel they last longer ( 60 years )
  • cheaper than sea walls

Disadvantages

  • if made from steel they only last 20-25 years as they rust

Hard/Soft?

  • hard enginneering
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Rip-rap / Rock armour

  • Large boulders of resistant rock

Advantages

  • look natural
  • absorb wave energy and protect weak cliffs behind

Disadvantages

  • expensive
  • not completely effective - allow some water through

Hard/Soft?

  • hard enginneering
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Revetments

  • Slatted wooden or concrete structures built at the base of a cliff

Advantages

  • absorb and spread wave energy through slats
  • don't interfere with longshore drift

Disadvantages

  • expensive
  • regular maintanence is needed

Hard/Soft?

  • hard enginneering
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Off-Shore reefs

  • rock or concrete barriers built on the sea bed a short distance from the coastline

Advantages

  • waves break on the barrier before reaching coast
  • allow a wide beach to develop

Disadvantages

  • expensive
  • can interfere with boats

Hard/Soft?

  • hard enginneering
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Beach Nourishment / Replenishment

  • adding sand taken from somewhere else, often offshore

Advantages

  • looks natural
  • provides a beach for tourists

Disadvantages

  • the sea keeps eroding it away, therefore has to be replaced every few years

Hard/Soft?

  • soft enginneering
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Managed Retreat

  • just allow the coast to erode
  • people and activities are gradually moved back from vunerable areas of coast

Advantages

  • natural
  • doesn't look ugly

Disadvantages

  • compensation has to be paid
  • disruption to people's lives

Hard/Soft?

  • soft enginneering
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Cliff Regrading

  • making the cliff face larger, so that it is less steep

Advantages

  • angle of cliff is reduced, making mass movement less likely
  • relatively cheap

Disadvantages

  • other methods need to be used at base of the cliff to stop it from being steepened again

Hard/Soft?

  • soft enginneering
9 of 9

Comments

Cookie-01

really good resource 

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