Hard Engineering Lyme Regis, Dorset Flashcards
Name 4 physical consequences of Lyme Regis eroding?
Loss of land.
Habitats destroyed.
Loss of beaches.
Retreat of land.f
Name 4 social consequences of Lyme Regis eroding?
Loss of buildings.
Loss of tourism.
Loss is value of land.
Social conflict.
Where is Lyme Regis located?
Tourist town visisted by 14,000 visitors in the summer located along south coasts of England.
Why is Lyme Regis subject to erosion?
As its situated in a natural bay between crumbling cliffs to the west and east.
The natural west to east long shore drift was interrupted by the connection of the harbour wall in 1970s.
Weak rock which also triggered land slides.
What happened to Lyme Regis when the harbour wall was made in the 1970s?
There was no longer any natural supply of beach forming sediment so beach is in long term decline.
What is Lyme Regis exposed to which encourages erosion?
South-westerly winds from the Atlantic and stormy conditions of the English Channel.
By the 1900s the sea walls were on verge of collapse.
Why were the sea walls on the verge of collapsing?
As winter storms removed beach material allowing waves to undermine the sea wall.
What did the PLAN aim to do?
Balance the need to protect the existing coastal land uses with preserving the attractive character of harbour.
Who was involved when making the PLAN?
It involved 10 different groups.
Lots of views and interests needed to be taken into account to make the scheme successful and sustainable.
Name 5 points of what was involved within the PLAN?
Rock armour - Hard Engineering. Beach nourishment - Hard Engineering. New sewerage system. New Sea wall. Planting vegetation - Soft Engineering.
What does beach nourishment aim to do?
Act as a buffer against storm waves.
Attract tourists.
Soften visual impact of other solutions.
What does the sea wall do?
Reflects the energy of the waves backwards away from promenade by the re curved top.
How much money was the PLAN estimated to be?
£33 million.
The amount of funding requires had to be justified so a cost-benefit analysis was needed.
What did the cost-benefit analysis have to demonstrate?
The sufficient economic benefit in implementing the scheme to confirm the viability of the coastal protection scheme - without this scheme government would not get grant aid funding.
What happened to the value of properties in the cost-benefit analysis?
The values of the properties were estimated independently.
Planners calculated present value benefits.
The calculation looked at the likelihood of properties and amenities being lost to erosion over time and the estimated financial benefit of saving them from destruction.
