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

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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.