2.3 Coastal defences Flashcards
1
Q
Function of sea walls
A
- Made of concrete
- Absorbs wave energy
2
Q
Features of sea walls
A
- Expensive
- Ugly
- Effective
3
Q
Functions of rip raps
A
giant boulders placed along the base of a cliff to absorb energy from waves and protect cliffs
4
Q
Features of rip raps
A
- Expensive
- Ugly
- Decreases beach access
- Effective
5
Q
Function of groynes
A
wood barriers built to trap sediment and stop it from being moved by longshore drift
6
Q
Features of groynes
A
- Ugly
- Expensive to build and maintain
- Effective
7
Q
Functions of gabions
A
- Large rocks in cages
- Absorbs wave energy
8
Q
Features of gabions
A
- Not expensive
- Short lifespan
- Ugly
- Easy to install
- Effective
9
Q
Function of reventments
A
- Similar to sea walls, made out of wood
- Absorbs wave energy
10
Q
Features of reventments
A
- Cheaper
- Not suitable when waves are high
- Short lifespan
- X protect against storms
11
Q
Process of beach nourishment
A
Adding more sand to the beach –> more water can be absorbed
12
Q
Process of managed retreat
A
Flooding land of low value - people stay away
