Coastal Defences - Groynes - Advantages and disadvantages table in GCSE Geography

Created by: ExamQueen101
Created on: 16-12-19 11:48


	Coastal Defences - Groynes
	Advantages Rock groynes at Sandbanks, Pool, have concrete crests for people to walk along to reach a viewing or fishing area Act as windbreaks At £5000 each they are relatively cheap Can last up to 40 years if well maintained Will create a larger beach, attracting tourists and boosting the local economy	Disadvantages They can impede walking along the beach Dangerous, as they have deep water on one side and shallow on the other. They may also be a danger to wind surfers who may collide with them They restrict the supply of sediment down-drift, therefore the problem is merely passed on to beaches further down Ineffective in stormy conditions Need regular maintenance so they do not rot May be considered unattractive, particularly degraded ones
	Evaluation These are wooden or concrete (or sometimes stone) structure built at right angles to the beach, stretching from the land to the sea. They are spaced apart at regular intervals. They trap sediment, stopping longshore drift. This creates a beach.Groynes certainly have more drawbacks than perks, with some of the advantages not being very valid, such as the fact that they act as windbreaks. This is not a great point in their favour. Because of the way they spread the problem and therefore only incur more cost, I would say these are not the best choice for coastal defences.

Coastal Defences - Groynes

Advantages

Rock groynes at Sandbanks, Pool, have concrete crests for people to walk along to reach a viewing or fishing area
Act as windbreaks
At £5000 each they are relatively cheap
Can last up to 40 years if well maintained
Will create a larger beach, attracting tourists and boosting the local economy

Disadvantages

They can impede walking along the beach
Dangerous, as they have deep water on one side and shallow on the other. They may also be a danger to wind surfers who may collide with them
They restrict the supply of sediment down-drift, therefore the problem is merely passed on to beaches further down
Ineffective in stormy conditions
Need regular maintenance so they do not rot
May be considered unattractive, particularly degraded ones

Evaluation

These are wooden or concrete (or sometimes stone) structure built at right angles to the beach, stretching from the land to the sea. They are spaced apart at regular intervals. They trap sediment, stopping longshore drift. This creates a beach.Groynes certainly have more drawbacks than perks, with some of the advantages not being very valid, such as the fact that they act as windbreaks. This is not a great point in their favour. Because of the way they spread the problem and therefore only incur more cost, I would say these are not the best choice for coastal defences.

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Coastal Defences - Groynes