Coastal Management - hard engineering Quiz

What is the primary purpose of sea walls?

• To enhance beach tourism

• To keep the sea out and protect the coast

• To promote sand deposition

• To provide habitats for marine life

What is a disadvantage of sea walls?

• They are inexpensive to build

• They require no maintenance

• They can be considered unattractive and may damage tourism

• They promote natural beach formation

What material are groynes typically made of?

• Plastic

• Metal

• Hard wood or concrete

• Sand

What is the main function of groynes?

• To increase wave energy

• To slow down longshore drift and build up the beach

• To attract marine wildlife

• To enhance beach aesthetics

What is a potential problem caused by groynes?

• They are too expensive to build

• They can cause extra erosion further down the coast

• They promote excessive sand deposition

• They are ineffective against wave energy

What is a gabion?

• A type of sea wall

• A metal cage filled with rocks

• A wooden fence

• A sand dune

What is the main advantage of gabions?

• They are very expensive

• They are effective at absorbing wave energy

• They require no maintenance

• They enhance beach tourism

What is a disadvantage of gabions?

• They are very costly to maintain

• They rust and can be damaged during storms

• They promote excessive erosion

• They are ineffective against wave energy

How much does it typically cost to build a sea wall per kilometre?

• £5 million

• £10 million

• £15 million

• £20 million

What is the typical cost of building groynes per metre?

• $1,000

• $3,000

• $5,000

• $7,000