North Norfolk homes to be worst hit by rising sea levels
- Credit: Daniel Hickey
North Norfolk could be among the worst hit areas in England by rising sea levels, according to a new study by Norwich-based researchers.
Experts at the University of East Anglia have said nearly 200,000 homes and businesses in England are at risk of being lost by the 2050s.
And they have warned there is an urgent need for national debate to address the flooding threat to coastal communities.
The research examines how rising sea levels caused by climate change, combined with erosion of foreshores by waves, are increasing coastal flood risk, and warns it may not be possible to protect some communities.
The study calls for the need of long-term clarity on “transformational change” in some areas, including rolling back defences and moving properties.
Lead author Paul Sayers, an engineering consultant who works with the University of East Anglia’s Tyndall Centre and has conducted analysis for the Climate Change Committee, said: “Significant sea level rise is now inevitable.
“For many of our larger cities at the coast protection will continue to be provided but for some coastal communities this may not be possible.
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“We need a serious national debate about the scale of the threat to these communities and what represents a fair and sustainable response, including how to help people to relocate.”
The paper, which is published in the journal Oceans And Coastal Management, compares the rising risk of coastal flooding with existing policies for managing the coast.
England could face around 35cm (14in) of sea level rise compared to historic levels by 2050 and is nearly certain to see close to 1m (3ft) of sea level rise by the end of the century, the study said.
Rising seas combined with increased wave-driven erosion are raising the risk of coastal flooding, forcing the Government and communities to decide how to respond – mainly whether to hold the line against the sea by building and maintaining defences or realign the shoreline and move properties.
For a thousand miles of English coast (1,600-1,900km), there will be high pressure to rethink the current policy to hold the line as it may become unfeasible due to rising costs, or technically impossible, the study says.
That accounts for around 30pc of the coastline where hold-the-line policies are in place, and could affect around 120,000 to 160,000 properties – excluding caravans – by the 2050s, with a proportion likely to need relocating.
The study says it is not possible to say how many of them will have to be moved, as that will be a matter for Government, policy and funding for flood defences.
The figure is on top of the 30,000 to 35,000 properties already identified in areas which have a policy to realign the coast.
The study focuses on the impacts of flooding and does not include properties directly at risk from coastal erosion such as clifftop homes.
Those most at risk are single communities, those with dispersed clusters of homes and buildings on a long flood plain such as the Somerset Levels, areas with a narrow space between the shoreline and rising ground, and small quay and coastal harbour communities of the type found across Cornwall.
The analysis highlights that those local authorities with the largest challenge in responding to sea level rise, through to 2050s and 2080s, with significant uncertainty regarding the ability to “hold the line” in the longer term in some locations, are likely to be: North Somerset; Wyre; Swale; Tendring; Maldon; Suffolk Coastal; North Norfolk; Cornwall; Medway; and Sedgemoor.
The study did not look at local features, or nationally important infrastructure such as nuclear power plants, that would mean the immediate coastline will be protected in the long term.
Responding to the study, Jim Hall, Professor of Climate and Environmental Risks at the University of Oxford said: “We need to have honest conversations with coastal communities that it will simply not be possible to protect every house and business from sea level rise.
“These changes are coming sooner than we might think and we need to plan now for how we can adjust, including a nationwide strategic approach to deciding how to manage the coast sustainably in the future.”
The Department for Environment, Food and Rural Affairs (Defra) has said it recognises the threat from climate change and has pledged a "record" £5.2bn investment in flood and coastal defences.
A Defra spokesman said: “We recognise the threat from climate change and sea level rise, which is why are investing a record £5.2 billion from 2021 in flood and coastal defences to better protect properties along our coasts.
“Our Coastal Transition Accelerator Programme is also exploring innovative approaches to adapt to the effects of coastal erosion, and shoreline Management Plans will outline long term plans to manage the risk of coastal change over the next 100 years.”