2.3 Coastal defences Flashcards Preview

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Flashcards in 2.3 Coastal defences Deck (12)
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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