Nigehörn

Nigehörn

Aerial photograph of Nigehörn
Geography
Location North Sea, Wadden Sea, Elbe mouth
Coordinates 53°56′53″N 8°25′49″E / 53.94806°N 8.43028°E / 53.94806; 8.43028
Area 50 ha (120 acres)
Administration
Germany
State Hamburg
Borough Hamburg-Mitte
Quarter Hamburg-Neuwerk
Demographics
Population 0 (uninhabited)
Pop. density 0 /km2 (0 /sq mi)

Nigehörn is an uninhabited artificial island in the North Sea belonging to the German city of Hamburg.

Geography

Located by the mouth of the Elbe, Nigehörn lies on the same sandbank as Scharhörn, about 4 km northwest from Neuwerk and 15 km northwest from Cuxhaven on the mainland. The island is a part of Zone 1 of the Hamburg Wadden Sea National Park.

Rising about 5 metres above sea level, the island is essentially flood-proof. However, it is not protected from storm surges, and is at risk of coastal erosion, especially on the western side.

The sandbank on which Scharhörn and Nigehörn lie is a European Union Natura 2000-designated bird sanctuary, tended to by the environmental group Verein Jordsand. The area, known as Scharhörnplate, is around 2.75 km long and 1.5 km wide with an area of approximately 500 ha. Unlike Scharhörn, where visitors may obtain official permission to visit, public access to Nigehörn is strictly forbidden.

Construction and history

Nigehörn was constructed in 1989 to compensate for ongoing land loss on nearby Scharhörn, which threatened to deprive shorebirds of important breeding grounds. Approximately 1.2 million cubic metres of sand were deposited on the sandbank by hydraulic fill to create the core of the new island.

In order to catch and hold down flying sand, barriers made from brushwood were arranged in a double-circle around the core, with "rays" extending outward from the circles. Three eastward-pointing double-bows of similar construction were built across the core itself to trap and retain sand in the heart of the island. Traces of these patterns can still be seen on aerial photographs of the island today, though they are by now weathered, sand-covered, and (in the western part of the island) eroded.

The newly constructed island measured 30 ha in total area. As pioneer flora began to colonise the island, helping the pre-existing structures to hold down sediments, Nigehörn began to grow naturally into the surrounding tidal mudflats. In this manner, the area of the island has increased over time to approximately 50 ha.[1]

References

  1. ↑ Institut für Angewandte Umweltbiologie und Monitoring, 2004
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