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===Description===
===Description:===


==== Methods of extraction ====
==== Methods of extraction ====
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* 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.  
* 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
Source: BFN, German Federal Agency for Nature Conservation===MSP Challenge===
 
===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 are polygons, i.e., geometric shapes that you can draw in, edit or remove when making a plan.
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Latest revision as of 20:09, 17 November 2020

Sand & Gravel Extraction
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Category Shipping
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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:

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Retrieved from "https://knowledge.mspchallenge.info/index.php?title=(NS)Sand_%26_Gravel_Extraction&oldid=1721"
This page was last edited on 17 November 2020, at 20:09. Content is available under GPLv3 unless otherwise noted.