Coastal Management
- Created by: Megan Smyth
- Created on: 09-12-13 23:26
View mindmap
- Coastal Management
- Soft Engineering
- Beach Replenishment
- Sand is brought in to build up the beach either from further along the coast or from offshore
- Looks natural and provides a beach to protect the coast and for visitors to enjoy
- Sea will continue to erode the beach so replenishment has to be repeated every few years
- Dune Management
- Sand dunes provide good natural protection for the coast
- Dunes may be damaged by storms or by visitors walking through them to get to the beach
- Dune management includes planting marram grass to stabilise the sand or fill gaps and by making wooden boardwalks for use as footpaths to reduce visitor impact
- Beach Replenishment
- Hard Engineering
- Groynes
- Groynes are built across beaches to stop the sand being washed away by longshore drift
- Beach material builds up on one side of the groyne. Trapping the material like this = problems elsewhere as it stops material moving down coast where, e.g. it may be building up/protecting base of cliff
- New groynes are expensive and need to be maintained to stop the wood from rotting
- Sea Walls
- Most effective method of halting sea erosion
- Most expensive - cost about £500,000 per metre to build
- Made of concrete and are curved to deflect power of waves; but sea can undermine them if beach material in front of them is not maintained
- Sea walls may be unsightly and can also restrict access to beach
- Revetments
- Sloping wooden fences with an open structure of planks to break the force of waves and trap beach material behind them, protecting base of cliffs
- Cheaper, but not as effective as sea walls
- Gabions
- Less expensive than sea wall or a revetment
- Cages of boulders built up at the foot of a cliff or on a sea wall
- Rip Rap or Rock Armour
- Cheapest method but still expensive
- Entails placing piles of large boulders on a beach to protect the cliffs from the full force of the sea
- Off-shore Breakwater
- Built on the sea bed or a short distance from the coast and they are usually made of rock or concrete
- Are effective because the waves break on the barrier before reaching the coast. This reduces wave energy and allows a beach to build up = protects cliffs
- Very expensive to build
- Groynes
- Soft Engineering
Comments
No comments have yet been made