Coastal Management

Groynes are an effective technique because they slow down the process of what occurring?

• Transportation

• Longshore drift

• Nearshore drift

• Deposition

How do groynes work to protect the coastline?

• They trap sediment by slowing down longshore drift, thereby building up a wide beach

• They absorb wave energy so that the cliffs behind are protected

• They act as a hard rock barrier at foot of cliff to provide a buffer again the sea

• They allow rapid longshore drift along the coastline

If the photo is facing south, which direction is longshore drift working in?

• west to east

• east to west

• south to north

• north to south

What is the main disadvantage of using groynes?

• They can starve other beaches of sediment

• Look ugly and unnatural

• Expensive

Which two coastal management structures can you see

• Sea wall and gabions

• Groyne and rock armour

• Gabions and groynes

• Sea wall and rock armour

A recurved sea wall is effective because it...

• Is not particularly expensive

• Stops erosion of the coastline

• Deflects wave energy back out to sea

Which one of the following is a soft engineering technique?

• Groynes
• Dune stabilisation
• Rip rap
• Revetments

Beach nourishment is .... (choose 2)

• when and or shingle is moved from the front to back of the beach by bulldozers

• When marram grass is planted to stabilise the beach

• A more sustainable form of protecting the coastline

• when and sand or shingle is dredged offshore and dumped onto beaches

Sand is being dumped or removed?

• Removed 
• Dumped 

What is the dumping of new sand onto an eroded beach to restore it?

• barrier island
• beach nourishment
• dredging
• jetty