(NS)Sand & Gravel Extraction

General Information

Additional Information

Visuals

Meta Data

Sand & Gravel Extraction

Layer Info
Category	Shipping
Editable	Yes
Data source	Estimations & data fragments
Types

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===

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

IN THIS TAB EXTENDED CONTENT IS PLACED

ON THIS TAB VISUAL CONTENT IS PLACED

Retrieved from

N/A

Description

N/A