Sandettie Bank

from Wikipedia, the free encyclopedia

The Sandettie Bank (French: Banc de Sandettié ) is an elongated sandbank in the North Sea , more precisely in the middle of the eastern entrance of the Strait of Dover . To the northwest of it lie the particularly dangerous Goodwin Sands , to the south the Ruytingen sandbank.

Since the shoal poses a considerable danger to the very strong shipping in the Strait of Dover, it was marked from 1902 to 1989 by a succession of French lightships , all of which were named Sandettié during their service there . The last lightship Sandettié was also the last manned French lightship to be decommissioned. Today the ship is anchored as a museum ship in front of the Dunkirk Harbor Museum .

Today the British authority Trinity House maintains an unmanned lightship, the Sandettie Lightvessel , to secure the Sandettie Bank. The ship also has an automatic weather station .

geology

Tertiary layers form the base of the sandbar . Only in the north-west were these removed by erosion . This erosion basin was filled with a sequence of sand layers from the Quaternary and above from the Holocene , a sequence of layers that otherwise superimposed the tertiary layer. The differences between heights and depths on the surface of the sandbar ( amplitude ) are up to 10 meters in altitude. The wavelength is up to 200 meters. Three shape areas can be distinguished. At the northern end of the sandbar there are linear transverse ribs with irregular amplitude and wavelength. In the lower area they consist of flint - gravel , in the upper area of ​​medium sands. These areas are fossil remains from the Preboreal - Subboreal period . At the southern end of the sandbar there are symmetrical underwater dunes of uniform amplitude and wavelength that are stable. To the west of the Sandettie Bank are asymmetrical underwater dunes that are believed to be unstable and move south.

biology

The Sandettie Bank is registered under the World Register of Marine Species u. a. populated by the following species:

Downs Herring

The area around the Sandettie Bank is the main spawning area of ​​the Downs herring, one of the large sub-stocks of herring in the North Sea. When stocks fell sharply due to overfishing, England successfully applied for a temporary ban on fishing in the area of ​​the Sandettie herring spawning site in 1958.

Web links

Readings and weather

Individual evidence

  1. ^ Sandettié Bank. In: Geographical Names. Retrieved June 16, 2018 .
  2. https://www.trinityhouse.co.uk/lighthouses-and-lightvessels/sandettie-lightvessel
  3. ^ R. Kirby and E. Oele: The Geological History of the Sandettie-Fairy Bank Area, Southern North Sea.Retrieved August 30, 2014
  4. Citation there: Leloup, E. (1941). Contributions to the study of Belgian fauna: 11. The Decapoda Brachyura of the Belgian coast. Bull. Mus. royal d'Hist. Nat. Belg./Med. Con. Natuurhist. Mus. Belg. 17 (11): 1-19]. Retrieved August 30, 2014
  5. Dromia personata - sponge crab at meerwasser-lexikon.de
  6. Ebalia tumefacta - stone crab at meerwasser-lexikon.de
  7. Hyas coarctatus - triangular crab at meerwasser-lexikon.de
  8. Pisa armata - triangular crab, spider crab at meerwasser-lexikon.de
  9. Liocarcinus navigator - Eyelashed Swimming Crab
  10. http://aquaticcommons.org/10492/
  11. http://www.rostocker-hochseefischerei.de/fanggebiete/nordsee.php?id=79
  12. http://literatur.ti.bund.de/digbib_extern/dk039354.pdf

Coordinates: 51 ° 14 ′ 0 ″  N , 1 ° 57 ′ 0 ″  E