Coastal Management
- Created by: Chidox
- Created on: 11-05-17 13:53
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- Coastal Management
- HARD Engineering
- Sea Wall
- Gabions
- CASE STUDY: Lyme Regis, Dorset
- Situated in a natural bay between crumbling cliffs to the west + east.
- Both HARD + SOFT engineering techniques
- Hard Engineering
- - Sea wall = recurved top to reflect energy of the the waves back.
- Rock Armour = large boulders of rock placed in front of the wall in some places to prevent excessive scouring.
- Soft Engineering
- Beach Nourishment= sand and shingle imported to buffer power of waves= protect sea wall from storms
- BENEFITS
- Great amenity value to tourists (e.g. beach holiday)
- Helps to soften visual impact of some of the hard engineering solutions.
- BENEFITS
- Beach Nourishment= sand and shingle imported to buffer power of waves= protect sea wall from storms
- Hard Engineering
- Groynes
- Revetements
- SOFT Engineering
- Beach Bourishment
- Managed Retreat
- CASE STUDY: Abbott's Hall Farm
- SOLUTION?= Coastal Realignment
- HOW?= Sea wall deliberately breached in October 2002= allowed salt water back into the land= two counter walls constructed at either end of the site to protect neighbouring land= elsewhere land rises gently from sea wall= serves as natural check for incoming tide without need for sea defences.
- Breaching of sea wall= timed to precede spring tides= allowed tide to float in new saltmarsh seedlings => allowed development of 81 hectares of mudflat, pioneer saltmarsh + coastal grassland
- BENEFITS
- Cheap
- Saltmarsh= rare in Europe
- Natural looking
- Boosts habitats for fish + plants
- Sustainable= naturally decompose as saltmarsh becomes MORE established.
- DISADVANTAGES
- Loss of land
- BENEFITS
- Breaching of sea wall= timed to precede spring tides= allowed tide to float in new saltmarsh seedlings => allowed development of 81 hectares of mudflat, pioneer saltmarsh + coastal grassland
- HOW?= Sea wall deliberately breached in October 2002= allowed salt water back into the land= two counter walls constructed at either end of the site to protect neighbouring land= elsewhere land rises gently from sea wall= serves as natural check for incoming tide without need for sea defences.
- SOLUTION?= Coastal Realignment
- Coastal Flooding
- Global warming=> rising sea level => increased number of storm surges + more river flooding
- Coastal Defences
- Flood Barrage
- Sea wall
- Managed Realignment
- HARD Engineering
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