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[[Category:(NS)Governance]] | |||
=General Information= | |||
{{Infobox | {{Infobox | ||
| title = Sand & Gravel Extraction | | title = Sand & Gravel Extraction | ||
|headerstyle = background:#595958; color:#f9f9f9; | |headerstyle = background:#595958; color:#f9f9f9; | ||
| header1 = Layer Info | | header1 = Layer Info | ||
| label2 = Category | data2 = | | label2 = Category | data2 = Shipping | ||
| label3 = Editable | data3 = | | label3 = Editable | data3 = Yes | ||
| label4 = | | label4 = Data source | data4 = Estimations & data fragments | ||
| header10 = Types | | header10 = 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: | |||
===MSP Challenge | |||
* 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: | |||
* [[(NS)Bottom Disturbace|Bottom disturbance]] | |||
* [[(NS)Noise|Noise]] | |||
=Additional Information= | |||
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Latest revision as of 20:09, 17 November 2020
This page was last edited on 17 November 2020, at 20:09. Content is available under GPLv3 unless otherwise noted.