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A tidal inlet (also Seegat , diminutive Gatje ) is a flow channel that constantly mostly because of back and forth through the flowing waters, tides , eroded. It is usually a relatively narrow - but deep (up to 30 meters) - passage between land masses (islands and peninsulas) or flat areas in the Wadden Sea and - less deep - on lagoon coasts without tidal range . The name is derived from the Low German and Dutch word Gat = hole and is related to High German Gasse and English gate , which all go back to a basic meaning passage .

Due to the comparatively large masses of water that flow fairly quickly through the narrowed part of the sea channel, there is strong erosion here, which both leads to a deepening compared to the rest of the seabed and endangers the neighboring islands. When the water masses from the mudflats behind the islands push back onto the open sea with the ebb current , they run again quickly through the narrow sea channel. But then the vastness of the open sea opens up and the water masses lose speed due to their areal expansion. As a result, the entrained particles of sand and silt settle in this lake-side area and form the ebb delta with the flattest places between the islands. These sandbanks are often called plates. Where the Gatten fairway runs over this flat line, which often runs in an arc between the islands, is the so-called barre. It is the shallowest part of the sea channel for shipping, at the same time it is also the deepest part of the shallowest connection between the islands. The flood delta forms on the landside in a very similar way.

In the German maritime regions, the Waterways and Shipping Office (WSA) usually marks a shipping route to the open sea. The area of ​​the flat bar, which is located in the sea-side area of ​​the Gatt, is the most dangerous place, here with electricity cables and, especially with currents against wind, very dangerous ground lakes to be expected.

Passages between inner and outer coastal waters, for example at the ends of the spits , the lagoon or in the area of ​​the lagoon coast , are referred to as sea gates.

See also

Individual evidence

  1. Armin Sinnwell, Glenn Riedel: Bertelsmann, the great Germany atlas . Wissen-Media-Verlag, Gütersloh, Wustrow auf dem Fischland, p. 75 ( google books ).
  2. Seegatt . In: Heinrich August Pierer , Julius Löbe (Hrsg.): Universal Lexicon of the Present and the Past . 4th edition. tape 15 . Altenburg 1862, p. 741 ( ).