Costal Management Flashcards
What does managed retreat do
Removes all defences and allows the sea to flood the land behind
Advantages of managed retreat
Cheap and easy
Doesn’t need maintaining
Disadvantage of managed retreat
Causes conflict with land owners
Requires long term planning
What is beach nourishment
Sand is pumped onto the beach from somewhere else like the sea
It is soft engineering
What is dune regeneration
Creating or restoring dunes by planting vegetation to stable the sand
Advantages of beach nourishment
Use natural materials
Gives a wider beach to slow down wave power
Advantages of dune regeneration
New habitat for wildlife
Provide a barrier between land and sea
Disadvantages of beach nourishment
Need matience regularly
Very expensive
Disadvantages of dune regeneration
Limited to small areas
Very expensive
What is sea walls
Made of concret and put at the foot of the cliff to prevent erosion
What is a gryone
Stops the sand moving up to beach due to longshore drift
What is rock armour
Big rocks put at the foot of the cliff or sea walls to protect against erosion
What is a gabion
A wall of wire cages filled with rocks at the bottom of a cliff
Advantages of sea walls
Stops the threat of flood
Stops risks of damage
Advantages of groynes
Cheap
Stops risk of damage
Advantages of rock armour
Reduce wave energy
Cheap
Advantages of gabions
Absorbed wave energy
Cheap and easy to build
Disadvantages of sea walls
Costs a lot
Not attractive
Disadvantages of gryones
Makes other beaches narrower
Needs constant maintenance
Disadvantages of rock armour
Ugly
Not safe for children
Disadvantages of gabions
Wire in cages can erode over time
Will need replaced every 10-20 years
