Coastal management and defences
- Created by: jesspalmer
- Created on: 14-05-16 17:16
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- COASTAL MANAGE AND DEFENCES
- Management strategies
- Do nothing - deal with it.
- Hold the line - maintain existing defences.
- Retreat the line - move people away.
- Advance the line - build new defences further out at sea.
- Hard enginering
- Groynes - fences at right angles to coast.
- Cheap. Starve down-drift.
- Gabions - rock filled cages.
- Cheap. Ugly
- Rip rap - boulders piled up on coast
- Cheap. Can shift in storms.
- Revetment - slanted walls at foot of cliff.
- Expensive to build. Creates strong backwash.
- Tidal barrages - dams built across estuaries.
- Very expensive. Disrupts sediment flow.
- Sea wall - reflects waves and is a barrier.
- Expensive to build and maintain. Creates strong backwash.
- Groynes - fences at right angles to coast.
- Soft engineering
- Marsh creation - plant vegetation, reduce erosion.
- Dune regeneration - sand dunes are created or restored.
- Coastal realignment - allow flood which creates marsh.
- Beach stablisation - plant trees, stablise sand.
- Land use management - restrict access to dunes.
- Beach nourishment - add sand to beach.
- Management strategies
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