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{{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 = DataOwner | data4 = | | label4 = DataOwner | data4 = Fragmented information, estimations | ||
| header10 = Types | | header10 = Types | ||
}} | }} | ||
===Description:=== | ===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: | |||
https://www.bfn.de/en/activities/marine-nature-conservation/pressures-on-the-marine-environment/sand-and-gravel-extraction.html | |||
===MSP Challenge 2050:=== | ===MSP Challenge 2050:=== | ||
Sand & gravel extraction create the following pressures on the ecosystem: | |||
* Bottom disturbance | |||
* Noise | |||
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Revision as of 15:08, 11 April 2018
| Layer Info | |
|---|---|
| Category | Shipping |
| Editable | Yes |
| DataOwner | Fragmented information, estimations |
| 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.
MSP Challenge 2050:
Sand & gravel extraction create the following pressures on the ecosystem:
- Bottom disturbance
- Noise
IN THIS TAB EXTENDED CONTENT IS PLACED
ON THIS TAB VISUAL CONTENT IS PLACED
This page was last edited on 11 April 2018, at 15:08. Content is available under GPLv3 unless otherwise noted.
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