3.6 - Reducing the rate of coastal erosion Flashcards
What are revetments?
Wooden or rock fence that allows waves through but reduces power
Revetment pros (2)
Impementled quickly
Cheap in short term
Revetment cons (3)
Unattractive
Reduce beach access
Regular maintanance
What are gabions?
Where are they placed?
Wire cage filled with rocks placed at foot of soft cliffs to absorb wave energy
Gabion pros (2)
Implemented quickly
Cheap
Gabion cons (3)
Unnatural
Rodents live in gaps
Deteriorate over time
What are groynes?
Wooden structure at right angle to beach. Prevent LSD by trapping sediment
Groyne pros (2)
Traditional
Widen beach
Groyne cons (3)
Built from unstable hardwood
Increase erosion elsewhere as deprived of sediment
Maintenance
What are concrete tetrapods?
Moulded concrete in interlocking connections
Concrete tetrapods pros (2)
Created onsite using moulds (reduce transport cost)
Long lasting and little maintenance
concrete tetrapods cons (3)
Restrict access to beach
Hazardous to coastal vessels
Unattractive
What is rock armour?
Hard rock placed at foot of cliff
Rock armour pros (3)
Effective at absorbing wave energy
Long lasting and little maintenance
More natural looking than tetrapods
Rock armour cons (3)
Restrict beach access
Dangerous if climbed on
High transport costs
