- Created by: DrewVickerstaff
- Created on: 06-11-19 16:51
Erosion is a natural process which shapes cliffs. Over time, erosion can cause cliff collapse - therefore the coastline needs to be managed. Hard engineering involves building artificial structures which try to control natural processes.
A sea wall
Concrete walls that are placed at the foot of a cliff to prevent erosion. They are curved to reflect the energy back into the sea.
- Effective at protecting the base of the cliff.
- Sea walls usually have promenades so people can walk along them.
- Waves are still powerful and can break down and erode the sea wall.
- Expensive - approximately £2,000 per metre.
Rock armour/rip rap
Rock armour on a beach
Large boulders placed at the foot of a cliff. They break the waves and absorb their energy.
- Cheaper than a sea wall and easy to maintain.
- Can be used for fishing.
- They look different to the local geology, as the rock has been imported from other areas.
- The rocks are expensive to transport.
Rocks are held in mesh cages and placed in areas affected by erosion.
- Cheap - approximately £100 per metre.
- Absorb wave energy.
- Not very strong.
- Look unnatural.