| Designations | |
|---|---|
| Official name | Morecambe Bay |
| Designated | 4 October 1996 |
| Reference no. | 863[1] |
Morecambe Bay is anestuary in north-west England, just to the south of theLake District National Park. It is the largest expanse of intertidalmudflats andsand in theUnited Kingdom, covering a total area of 120 sq mi (310 km2). In 1974, the second largest gas field in the UK was discovered 25 mi (40 km) west of Blackpool, with original reserves of over 7 trillion cubic feet (tcf) (200 billion cubic metres). At its peak, 15% of Britain'sgas supply came from the bay but production is now in decline. Morecambe Bay is also an important wildlife site, with abundant birdlife and varied marine habitats.
The riversLeven,Kent,Keer,Lune andWyre drain into the Bay, with their various estuaries making a number ofpeninsulas within the bay. Much of the land around the bay is reclaimed, formingsalt marshes used inagriculture. The bay is known for its wildlife populations, being aSpecial Area of Conservation,Special Protection Area and aSite of Special Scientific Interest,[2] and there is abird observatory atWalney Island. Some of the surrounding land is also aprotected area, forming theMorecambe Bay Pavements, home to rare butterflies such as thehigh brown fritillary. The bay has richcockle beds, which have been fished by locals for generations.
There areseven main islands in the bay, all to the west;Walney,Barrow,Sheep,Piel,Chapel,Foulney andRoa. Walney is substantially larger than the others, with its southern tip marking the north-western corner of the Bay. Sheep, Piel, Chapel and Foulney Islands are tidal and can be walked to at low tide with appropriate care. Local guidance should be sought if walking to Chapel or Piel islands as fast tides and quicksand can be extremely dangerous. Roa Island is linked to the mainland by a causeway, while Barrow Island has been connected to the mainland as part of the docks system atBarrow-in-Furness.[3]
The extensive sandflats are the remains of a vastsandur or outwash plain established by meltwaters as the last ice age waned. Sea-level was still some 3m below present day levels at the start of theHolocene some 11,000 years ago.[4][5]
The Greek geographer and astronomer ClaudiusPtolemy (died c170 AD) referred in his writings toMorikambe eischusis as a location on Britain's west coast, lying between theRibble and theSolway. The sixteenth-century scholarWilliam Camden identified the locality as being nearSilloth, hence thesimilar name of that bay but the eighteenth century antiquarianJohn Horsley who translated Ptolemy into English in 1732 favoured it being the bay on the thenLancashire—Cumberland border. In 1771 historianJohn Whitaker took up this latter suggestion[6] and the name appeared on maps subsequently. The first recorded to do so being one associated withFather Thomas West'sAntiquities of Furness of 1774. Camden believed the name originated with two words meaningcrooked sea whilst West offered upwhite/beautiful haven though current thought is that it refers to acurve of the sea.[7]
The bay hasquicksand and fast movingtides. There have been royally appointed local guides (holding the post ofKing's Guide to the Sands) for crossing the bay for centuries;[8] appointment of guides is now delegated to a trust.[9] This difficulty of crossing the bay added to the isolation of the land to its north which, due to the presence of the mountains of the Lake District, could only be reached by crossing these sands or by ferry, until theFurness Railway was built in 1857. This skirts the edge of the bay, crossing the various estuaries. TheLondon-Glasgow railway also briefly runs alongside the bay – the only place where theWest Coast Main Line actually runs alongside the coast.
The dangers presented by the bay were demonstrated in the 2004Morecambe Bay cockling disaster when 23 illegal immigrants from China were drowned by an incoming tide, after being cut off while harvesting cockles. Criminal prosecution of thegangmaster and his associates for manslaughter and aiding immigration offences resulted in terms of imprisonment.[10] Theseevents were covered in a drama film and a non-fiction documentary. The incident has had a lasting effect on the community and estuary harvesting regulations.[11]
Morecambe Bay is also home to several of the UK's offshore wind farms:West of Duddon Sands,Burbo Bank,Walney,Barrow, andOrmonde.
Around 320,000 people live along the coastline of Morecambe Bay,[citation needed] with the largest town being Barrow-in-Furness to the west.Morecambe was once a popular seaside holiday destination, whilst Barrow still relies on the seas for a large percentage of its economy in ship and submarine construction.
| Town | County | Population[12] |
|---|---|---|
| Barrow-in-Furness | Cumbria | 69,000 |
| Morecambe | Lancashire | 34,800 |
| Fleetwood | Lancashire | 25,900 |
| Ulverston | Cumbria | 11,200 |
| Heysham[citation needed] | Lancashire | 8,500 |
| Grange-over-Sands | Cumbria | 4,000 |
The bay has Britain's second-largest natural gas field,[13] in the TriassicSherwood Sandstone with a seal of Mercia Mudstone[14] and a Carboniferous source.[13] The South Morecambe Field, covering an area of 32 sq mi (83 km2), was discovered in 1974 and the first gas came ashore in 1985.[15] The North Morecambe Field, found in 1976, 8 mi (13 km) to the north, is 11 sq mi (28 km2) and started production in 1994.[15] Both are operated byCentrica Energy.[15] They are 25 mi (40 km) west of Blackpool in 30 metres of water;[15] the top of the gas reservoir is at a depth of just 900 m (3,000 ft), necessitating slant drilling for the first time in European waters.[14] The combined gas reserves on discovery were estimated at 179 billion cubic metres (6.45 trillion cubic feet (tcf)).[15] A further 0.65tcf is recognised in the satellite fields of Bains, Calder (Rivers), Dalton, Millom East and Millom West, and a number of smaller fields have been identified.[15]
The gas is landed at three terminals at Westfield Point in Barrow-in-Furness, collectively referred to as theRampside Gas Terminal.[15] The South Morecambe Central Processing Complex is connected via a 36-inch pipeline to the South Morecambe terminal.[15] North Morecambe gas has a different composition so the unmanned Drilling and Production Platform is linked by a separate 36" wet sealine to the North Morecambe Terminal, where it is stripped of water, CO2 and nitrogen.[15] The Rivers Terminal has a dedicated pipeline for sour gas from the Calder field, which must be stripped of hydrogen sulphide before processing by the North Morecambe Terminal.[15] The hydrogen sulphide is converted to sulphuric acid which is sold for industrial use. In 1991 a 229 MW CCGT power plant was opened near the terminals, on the site of the former coal-firedRoosecote Power Station. There is a support base atHeysham Port and personnel are typically moved by helicopter fromBlackpool International Airport.[15] Five rig workers and the two pilots of aEurocopter AS365 Dauphin were lost whenit crashed in sight of the platform on 27 December 2006.[16]
At peak production 15% of UK supply came from the two main fields.[15] As of 2006 Centrica reckoned there was about 1.2tcf of economic gas remaining in them, and they planned to operate the fields for another 10–15 years.[15] In June 2011 they announced the South Morecambe field would be suspended as a result of tax increases in the2011 Budget which meant South Morecambe would be paying a rate of 81% tax; North Morecambe and Rivers would continue in production[17] as they are taxed at 62%.[18] Production resumed from the South Morecambe field in July 2011.[19]
In 2004, a proposal was made to build a bridge across the bay flanked by wind turbines and usingtidal power.[20][21][22] Proposals fromNorthern Tidal Power Gateways in 2019 outlined a tidal barrage with a road running along on top.[23][24]
Reynolds, Francis J., ed. (1921)."Morecambe Bay" .Collier's New Encyclopedia. New York: P. F. Collier & Son Company.
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