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Sea wall

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Date created

Mar 1, 2020

Cards (13)

Section 1

(13 cards)

Sea wall

Front

A concrete wall which aims to prevent erosion of the coast by providing a barrier which reflects wave energy.

Back

Cliff regrading

Front

A soft engineering technique which involves changing the gradient of a cliff so it is not as prone to mass movement. Retains the natural look of the beach but is very expensive.

Back

Dune stabilisation

Front

Marram grass planted to stabilise dunes

Back

Rip Rap (Rock Armour)

Front

large rocks placed at the base of a cliff/sea wall.

Back

Groynes

Front

Wooden or concrete barriers at right angles to the beach

Back

Gabions

Front

Steel mesh cages filled with small rocks, absorb wave energy.

Back

Soft engineering

Front

Managing erosion by working with natural processes to help restore beaches and coastal ecosystems

Back

Sea Walls - advantages

Front

Highest level of protection in the short term Lifespan of up to 50 years Effectively prevents erosion in the local area * Often has a walkway /promenade for people to walk along * Eg Swansea Bay, S Wales

Back

Groynes advantages

Front

.Cheaper than sea walls - not too expensive * .Build beach up locally = attract more tourists* .Provides structures useful for fishing * .Absorbs wave energy- reducing erosion

Back

Beach replenishment

Front

Pumping sand or shingle back onto the beach to replace eroded material

Back

Sea Walls - disadvantages

Front

.Beach level drops and could underline the wall .More erosion further down the coast (greater downdrift) .More erosion in areas that aren't protected .Very high maintenance - the most expensive * .Can be obtrusive and unnatural to look at *

Back

Hard engineering

Front

The use of concrete and large artificial structures by civil engineers to defend land against natural erosion processes.

Back

Groynes disadvantages

Front

1) In interrupting longshore drift, they starve other beaches downdraft, often leading to increased rates of erosion elsewhere. 2) Problem is not solved but rather shifted. 3) Groynes are unnatural and rock groynes are particularly unattractive.

Back