Topic 4a- Coasts Flashcards
1
Q
Name two methods of hard engineering on coastal defences
A
Concrete sea walls
Wooden groynes
2
Q
How are concrete walls not ideal methods of protection
A
Costly
Ugly
But effective
3
Q
How do concrete sea walls work
A
They curve in shape to deflect the energy of an advancing wave into that of the next
4
Q
How are wooden groynes built and to prevent what?
A
Built at right angles
They prevent the movement of long shore drift.
This means the beach will increase in width and protect the cliffs behind from erosion === tourism
5
Q
Cost benefit analysis is worked out how?
A
Benefit/cost
