(NS)Sand & Gravel Extraction

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Sand & Gravel Extraction

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Description:

Methods of extraction

Typical purposes of sand or gravel extraction can be to obtain useful material (for e.g. heightening beaches, or in building or infrastructure development), and/or to deepen the sea in a particular area (e.g. a fairway to allow large cargo or tanker vessels with deeper drafts to enter a port).

There are two main methods of extracting sand and gravel:

• In stationary extraction, an anchored cutter suction dredger excavates huge pits in the sea floor with depths of normally about 10 m and diameters of between 10 and 50 m.
• In the second method, a trailing suction hopper dredger removes sediment from the surface of the sea floor. The dredger is pulled along the sea floor like a vacuum cleaner and leaves behind a furrow between 2 and 4 m wide and up to 0.5 m deep.

Source: BFN, German Federal Agency for Nature Conservation

MSP Challenge 2050:

Sand & gravel extraction areas are polygons, i.e., geometric shapes that you can draw in, edit or remove when making a plan.

Sand & gravel extraction areas create the following pressures on the ecosystem:

• Bottom disturbance
• Noise

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