3.6 - Reducing the rate of coastal erosion Flashcards Preview

A-Level Geography - Coastal; systems and landscapes > 3.6 - Reducing the rate of coastal erosion > Flashcards

Flashcards in 3.6 - Reducing the rate of coastal erosion Deck (21)
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1

What are revetments?

Wooden or rock fence that allows waves through but reduces power

2

Revetment pros (2)

Impementled quickly

Cheap in short term

3

Revetment cons (3)

Unattractive

Reduce beach access

Regular maintanance

4

What are gabions?
Where are they placed?

Wire cage filled with rocks placed at foot of soft cliffs to absorb wave energy

5

Gabion pros (2)

Implemented quickly

Cheap

6

Gabion cons (3)

Unnatural

Rodents live in gaps

Deteriorate over time

7

What are groynes?

Wooden structure at right angle to beach. Prevent LSD by trapping sediment

8

Groyne pros (2)

Traditional

Widen beach

9

Groyne cons (3)

Built from unstable hardwood

Increase erosion elsewhere as deprived of sediment

Maintenance

10

What are concrete tetrapods?

Moulded concrete in interlocking connections

11

Concrete tetrapods pros (2)

Created onsite using moulds (reduce transport cost)

Long lasting and little maintenance

12

concrete tetrapods cons (3)

Restrict access to beach

Hazardous to coastal vessels

Unattractive

13

What is rock armour?

Hard rock placed at foot of cliff

14

Rock armour pros (3)

Effective at absorbing wave energy

Long lasting and little maintenance

More natural looking than tetrapods

15

Rock armour cons (3)

Restrict beach access

Dangerous if climbed on

High transport costs

16

What are offshore reefs?

Man-made islands causes wave to break so calmer water

17

Offshore reefs pros (2)

Relocating natural process offshore

Islands form habitats

18

Offshore reefs cons (2)

Regular maintenance

Construction material contaminate water

19

What are sea walls?

Concrete wall that is curves to reflect energy back to sea

20

Sea wall pros (1)

Effective and long lasting

21

Sea wall cons (2)

Expensive

High maintenance as can fracture