Coastal Management: The Holderness Coast
Britain's Fastest-Eroding Coast
The Holderness coast in East Yorkshire stretches 61 km from Flamborough Head in the north to Spurn Head in the south. It is the fastest-eroding coastline in Europe. The cliffs are made almost entirely of boulder clay — a soft, glacially-deposited mixture of clay, sand and gravel that slumps easily when saturated. The coast retreats at an average of 1.8 metres per year, and in places more than 10 metres in a single storm. Around 30 villages have been lost to the sea since Roman times.
Why Holderness Erodes So Fast
Three factors combine. First, the rock is weak: boulder clay has no cement holding it together. Second, the coast faces north-east and has a very long fetch across the North Sea, so it receives big destructive waves — especially during winter storms with strong easterly winds. Third, the offshore zone is shallow, which keeps wave energy high right up to the cliff base. Once material falls into the sea, longshore drift carries it south at around 1.5 metres per day, leaving the cliff base exposed for the next wave attack.
Holderness retreats at an average of 1.8 m per year. Three factors combine: weak boulder clay cliffs, long North Sea fetch with destructive waves, and a shallow offshore zone. Around 30 villages have been lost since Roman times.
Hard Engineering
Hard engineering uses built structures to resist the sea. The Holderness coast has examples of all the main types.
Sea walls. A solid concrete wall protects the coast and reflects waves back to sea. Hornsea and Withernsea both have curved concrete sea walls along their seafronts. Sea walls protect towns well, but they are expensive (around £6,000 per metre) and ugly. Reflected waves scour the beach in front, so the wall needs constant maintenance.
Rock armour (also called rip-rap). Large boulders piled at the cliff base absorb wave energy. Cheaper than a sea wall (around £1,000–3,000 per metre) and easier to install. At Mappleton, a rock revetment of granite boulders imported from Norway protects the foot of the cliff.
Groynes. Wooden or rock fences built at right angles to the beach trap sediment carried by longshore drift, building up the beach so it absorbs wave energy. Two large rock groynes, built at Mappleton in 1991, have built up a wide beach there — but they have starved Cowden, just 3 km south, of sediment. Cowden's cliffs are now retreating faster than ever.
Gabions. Steel-mesh cages filled with rocks. Cheap and quick to install but ugly and only last around 25 years. Used at Easington Gas Terminal as a short-term measure.
Soft Engineering
Soft engineering works with natural processes rather than against them. Beach nourishment adds sand or shingle dredged from offshore to widen the beach, so it absorbs more wave energy. Hornsea's beach is topped up periodically. Beach reprofiling uses bulldozers to reshape a steep, low beach into a gentler slope. Dune regeneration — planting marram grass and fencing off areas — rebuilds dunes as a natural sea defence. Soft engineering is cheaper and more sustainable than hard engineering but needs ongoing investment.
Managed Retreat
Managed retreat — sometimes called coastal realignment — means deliberately allowing low-value land to flood or erode. Defences are removed and the sea is allowed to advance up to a new line further inland. Compensation is paid to landowners. The Environment Agency now uses this approach for parts of the Holderness coast where farmland or holiday parks are not worth defending. The trade-off: it is far cheaper than hard engineering, and it lets natural ecosystems (salt marsh, mudflats) re-establish, which act as future buffers. But homes and businesses are lost, and individual residents understandably resist it.
Mappleton's 1991 scheme (about £2 million) of two rock groynes and a rock revetment saved the village and the B1242 coast road but starved Cowden of sediment. Cowden now erodes faster — an example of how protecting one place can damage another.
Conflicts on the Coast
Coastal management always creates winners and losers. At Mappleton, residents are protected but homeowners further south at Cowden have lost gardens and clifftop bungalows to accelerated erosion. Easington Gas Terminal is defended because it processes 25% of the UK's gas supply, but the farmers either side feel the gas industry is favoured over agriculture. Shoreline Management Plans set out which sections of coast will be defended, allowed to retreat, or held as they are. The Holderness plan defends Bridlington, Hornsea, Withernsea and the gas terminal — but allows much of the farmland coast to retreat.
Defending all 61 km of the Holderness coast with sea walls would cost roughly £370 million in construction and tens of millions a year in maintenance — for land worth a fraction of that. Worse, walls protecting one section deflect wave energy onto the next, accelerating erosion downstream. Hard defences also block the supply of sediment that builds Spurn Head and protects the Humber Estuary. The Environment Agency therefore takes a strategic approach: defend places of high value (towns, the gas terminal); allow farmland to retreat; let the natural sediment supply continue to build Spurn Head.