Coastal Defense Methods Quiz

What is the main point of groynes?

• To create new habitats

• To trap sand and prevent erosion

• To provide a place for tourists

• To increase wave energy

What is a problem with managed retreat?

• Creates a strong backwash

• Can be sharp and hurt tourists

• Land flooded is often rural and attractive

• Causes erosion down the coast

How long do wooden revetments last for?

• 10 years

• 25-30 years

• 100 years

• Forever

What rating for looks did rip rap or rock armour get?

• 5/10

• 6/10

• 8/10

• 10/10

What rating for looks did revetments get?

• 2/10

• 4/10

• 5/10

• 10/10

How do groynes work?

• They are sloping ramps that absorb wave energy.

• They are fences placed at right angles to the beach to trap sand.

• They are large boulders piled on the beach.

• They are steel mesh cages filled with boulders.

What is the cost per meter for a sea wall?

• £1200

• £1000

• £5000

• £2000

What is the cost per meter for gabions?

• £1200

• £1000

• £400

• £2000

Why do coastal areas choose beach replenishment?

• To replace sand washed away and absorb wave energy

• To build new beaches for tourism

• To create habitats for marine life

• To prevent pollution in the ocean

Why do coastal areas install sea walls?

• To enhance the aesthetic of the coastline

• To prevent coastal erosion and flooding

• To create new land for development

• To attract marine wildlife