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Coastal Protection Methods (Wooden Revetments (Absorbs sea energy instead…
Coastal Protection Methods
Sea Wall
How does it protect the coast?
Concrete or rock barrier placed at the foot of a cliff, to reflect wave energy
Sustainability -
I think that it is good overall, however, it costs a lot of money, but is good in the long term.
Advantages of method
Effective at stopping waves.
Often creates a walkway for people to walk on.
Long term
Good investment
Disadvantages of method
Looks unnatural
Costs a lot of money
Can ruin scenery.
High maintenance
Rock Armour
Piles of large boulders dumped at the foot of a cliff. Rocks force the waves to break, absorbing their energy and protecting the cliffs.
Relatively cheap and easy to maintenance.
Can provide interest to the coast.
Often can be used for fishing.
Rocks are usually from other parts of the coastline or abroad.
Can be expensive to transport.
Do not fit in with local geology.
Can be very obtrusive.
I think this is quite a good idea, however, there is a chance that the rocks will erode away after a long time.
Groynes
Beach Replenishment
Wooden Revetments
Absorbs sea energy instead of the cliff, it acts as a filter for the water. Acts as a battering ram for the water to hit, commonly used in Norfolk where there is the highest rate of erosion.
Protects cliff and slows down erosion.
Cheaper than sea walls
It is only £500 - £1000 per square meter.
Weaker and not as strong as the sea wall (concrete/rock)
Short term
Often break
Hazard to people.
Doesn’t fit with the landscape
I think that they are not as effective as the sea wall, but then again, they are also short term and in the long term will cost more.
Gabions
Wire cages filled with rocks that can be built up to support a cliff or provide a buffer against the sea.
I think that gabions are very good, as they go into the landscape, and look decent while protecting the beach.
Cheap to produce and flexible in the final design.
Can improve drainage of cliffs.
Will eventually become vegetated and merge into the landscape
They cost up to £50,000 per 100 meters.
For awhile they look very unattractive
Cages only last 5 - 10 years before they rust.