Inner and Outer Dowsing sand banks

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The Inner and Outer Dowsing sand banks are shallow-water shoals off the Lincolnshire coast of the UK sector of southern North Sea. They have been used for navigation, as a commercial fishery, for aggregate dredging, and more recently as the location for major offshore wind farms.

Contents

Dowsing banks and shoals

The Inner Dowsing Bank is 7.5 km long north to south by 3.0 km wide. The centre of the bank is about 13 km north-east off Ingoldmells Point, Lincolnshire. The water depth ranges from 1 m to 30 m below sea-level. [1] The Inner Dowsing Bank together with the adjacent Race Bank and North Ridge Bank have been designated a Special Area of Conservation (SAC) and a Marine Protected Area (MPA). [1] The Inner Dowsing sandbank comprises coarse sand with areas of gravel, its elongated shape is maintained by the tidal currents. [1]

The Outer Dowsing Shoal is a shallow-water sand bank, aligned north-west to south-east. [2] The shoal is about 19.5 km long and is rarely more than 1 km wide. Its mid point is located about 65.2 km due west of Donna Nook on the Lincolnshire coast. At its shallowest the water depth is 4 m. [2] The bank comprises gravel and sand deposits. To the south-west of the bank and running parallel to it is the Outer Dowsing Channel an area of relatively deep water. Both the channel and an area to the north-east of the shoal have been designated for dredging for sand gravel and pebbles. [3]

Fishing

The Inner Dowsing Bank is a spawning and nursery ground for commercially important fish such as the sand eel and the Atlantic herring and is a feeding ground for lemon sole, European plaice, common lobster and the commercially exploitable pink shrimp. [1] Around the Outer Dowsing area commercially important fish include whiting, dab, sprat, herring, plaice, mackerel and lemon sole. Less abundant but commercially important species include cod, haddock, sole and ling. [2]

Windfarms

See main articles  Lynn and Inner Dowsing wind farms; Triton Knoll wind farm

The Lynn and Inner Dowsing wind farms were originally separate schemes but were developed as a single project. Construction work began in 2006 and was completed in 2009. The wind farm is located at the south-west corner of the Inner Dowsing bank. The farm has a maximum output of 194 MW from 54 Siemens turbines with a generating capacity of 194 MW. [4] The capacity factor of the farm has been 31 to 36%.

The Outer Dowsing Offshore Wind project is a 1.5 GW offshore windfarm in the Southern North Sea 54 km from the Lincolnshire coast. The project is currently (2023) undergoing consultation. [2]

The Triton Knoll wind farm is located immediately west of the Outer Dowsing Channel. It has an output capacity of 857 MW generated by 90 × 9.5 MW turbines. [5]

The Inner and Outer Dowsing banks and shoals present a hazard to shipping because of the shallow water. The shoals have therefore been marked by a variety of navigation markers, including lightships, light houses and buoys.

Light vessels

Dimensions of light vessels used on the Dowsing banks
NameLength (m)Beam (m)Depth (m)Gross tonnage
LV 1626.676.403.35158
LV 8238.07.64.6309
LV 9340.847.624.57519
LV 9540.00517

Other infrastructure

The Inner Dowsing Light Vessel was replaced in 1971 by the Dowsing light tower. This was a four-leg steel structure formerly belonging to the National Coal Board where it had been used to undertake prospective drilling for natural gas in the North Sea. This was the first steel structure of its kind off the coast of Britain. [12] In 1991 after 20 years of service, the inner Dowsing light tower was decommissioned and brought back to shore and dismantled. The Inner Dowsing light was replaced by a LANBY (Fl. 10s 12m 15 Nautical miles Horn (1) 60s). [13]

Also in 1991 the gas production installation designated 27/14 B1D (53° 33’ 43” N  0° 52’ 48” E) was installed in the North Sea to exploit the Amethyst gas field. [14] The B1D platform is located 4.5 miles West of the North end of Outer Dowsing Shoal. The platform was equipped with a Racon and a light, the light characteristic was Fl (2) 10 s it was at 28 metres and had a range of 22 Nautical Miles. [14] It also had a Horn (2) 60 s. In 2020 the owners Perenco stated its intention to decommission the Amethyst field and to remove all the platforms, including B1D. This exercise was completed in 2022. [15]

Buoys

Today the Inner and Outer Dowsing sand banks are marked with a number of buoys as aids to navigation. [16]

Inner and Outer Dowsing buoys
NameCoordinatesCharacteristic Light Characteristic Range (nautical miles)Buoy type (see note)Other features
Inner Dowsing53° 19.100' N 00° 34.800' EWest markQ (3) 10s71 Racon
Middle Outer Dowsing53° 24.819' N 01° 07.790' EGreen coneFl (3) G 10s52
North Outer Dowsing53° 33.517' N 00° 59.590' ENorth markQ91Racon/AIS
South Inner Dowsing53° 12.119' N 00° 33.694' ESouth markQ (6) + LFl 15s52Bell

Note: Type 1 buoys are 15 metres tall and weigh 10 tonnes, Type 2 buoys are 3 metres diameter and weigh 6 tonnes. [17]

Ship wrecks

An incomplete list of ships wrecked on the Inner and Outer Dowsing shoals: [18]

Ships wrecked on the Inner and Outer Dowsing shoals
DateNameLocation
January 1861Cockermouth CastleInner Dowsing
December 1863LunaOuter Dowsing
February 1870MoroOuter Dowsing
August 1875JonesOuter Dowsing
September 1875AquilaOuter Dowsing
May 1882CanomaOuter Dowsing
November 1888AladinInner Dowsing
October 1895Michele B SkutakaInner Dowsing
September 1901John PickardInner Dowsing
September 1901 HMS Cobra Outer Dowsing
December 1906HeathpoolOuter Dowsing
September 1908PacificOuter Dowsing

See also

https://newsquest.newsprints.co.uk/39650690-lightships-light-vessels-pictured-inner-dowsing-light-tower-date-14-sep-1971-8-the-new-light-tower-the-first-steel-structure-of-its-kind-off-the-coast-of-britain-guarding-the-inne/ Inner Dowsing light tower.

https://www.facebook.com/USLHS/photos/a.10150103796267011/10158452765122011/?type=3 Inner Dowsing light tower.

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References

  1. 1 2 3 4 Joint Nature Conservation Committee. "Inner Dowsing, Race Bank and North Ridge SAC" . Retrieved 14 September 2023.
  2. 1 2 3 4 "Outer Dowsing Offshore Wind" . Retrieved 14 September 2023.
  3. ↑ Admiralty Chart, Outer Dowsing to Smiths Knoll, ESFJC1503A (2009)
  4. ↑ Lynn and Inner Dowsing (LID). "Lynn and Inner Dowsing (LID)" . Retrieved 14 September 2023.
  5. ↑ "About Triton Knoll" . Retrieved 19 September 2023.
  6. ↑ "Notice to Mariners". Daily News. 2 April 1861. p. 1.
  7. ↑ National Historic Ships UK. "Light Vessel 16" . Retrieved 14 September 2023.
  8. ↑ Tyne Built Ships. "Outer Dowsing" . Retrieved 14 September 2023.
  9. ↑ National Historic Ships UK. "Light Vessel 93" . Retrieved 14 September 2023.
  10. ↑ Trinity Buoy Wharf. "Light ship LV95" . Retrieved 14 September 2023.
  11. ↑ "World of Lighthouses: Trinity House Light Vessel 95" . Retrieved 15 September 2023.
  12. ↑ Newsquest. "Inner Dowsing Light Tower" . Retrieved 14 September 2023.
  13. ↑ Admiralty Chart 1190 Flamborough Head to Blakeney Point (1997)
  14. 1 2 US Government. "Sailing Directions North Sea" (PDF). Retrieved 14 September 2023.
  15. ↑ "Amethyst Decommissioning" (PDF). Retrieved 14 September 2023.
  16. ↑ AtoN-Review-2020-2025-pdf (1).pdf   Aids to Navigation review 2020 to 2025
  17. ↑ Trinity House. "Navigation buoys" . Retrieved 15 September 2023.
  18. ↑ The Times newspaper various dates
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