Sea defenses.

A few positives and negatives of sea defences.

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  • Created by: Nadia
  • Created on: 04-06-12 12:19

Sea wall

HARD ENGINEERING 


ADVANTAGES-Protect the base of cliffs.


DISADVANTAGES-Expensive to build and maintain. Ugly and restricts access to the beach.

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Groynes

HARD ENGINEERING

ADVANTAGES-Prevent long shore drift.

DISADVANTAGES- They can look unsightly and often  do not last long because wood rots. Places up shore may lose their beaches and protection, thus transferring the problem elsewhere.

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Rip Rap

HARD ENGINEERING

ADVANTAGES- Absorb wave energy and protect weak cliffs behind.

DISADVANTAGES- Expensive and they still let some waveenergy through . They  can   also restrict access.

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Reventments

HARD ENGINEERING 

ADVANTAGES-These absorb wave energy.

DISADVANTAGES-  They require regular maintance and are  expensive.

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Offshore reefs

HARD ENGINEERING.

ADVANTAGES- Waves break on the barrier before reaching the coast and are reduced significantly.

DISADVANTAGES-  The may interfere with boats and are very expensive.


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Beach replenishment

HARD ENGINEERING.

 

ADVANTAGES- Waves break on the barrier before reaching the coast and are reduced significantly.

DISADVANTAGES-  The may interfere with boats and are very expensive.

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Managed retreat

SOFT ENGINEERING.

 

ADVANTAGES- No threat to human safety and natural processes are allowed to continue.

DISADVANTAGES-  Compensation has to be paid for disruption to homes and businesses.

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Cliff regrading


SOFT ENGINEERING.

 

ADVANTAGES- The angle of the cliff is reduced so mass movement is unlikely, and this is often considered relatively cheap.

DISADVANTAGES-  Other methods have to be used to stop the cliff being steepened again.


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