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Dredging - Wikipedia, the free encyclopedia
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Dredging
From Wikipedia, the free encyclopedia
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Dredge)
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"Dredge" redirects here. For other uses, see
Dredge (disambiguation).
"Dredgers" redirects here. For the German municipality, see
Dreggers.
Dredging is an
excavation activity or operation usually carried out at least partly underwater, in shallow seas or
fresh water areas with the purpose of gathering up bottom
sediments and disposing of them at a different location. This technique is often used to keep waterways navigable.
It is also used as a way to replenish sand on some public beaches, where too much sand has been lost because of
coastal erosion. Dredging is also used as a technique for fishing for certain species of edible
clams and
crabs, see
fishing dredge.
A dredge is a device for scraping or sucking the seabed, used for dredging. A dredger is a ship or boat equipped with a dredge. The terms are sometimes interchanged.
The process of dredging creates spoils (excess material), which are carried away from the dredged area. Dredging can produce materials for land reclamation or other purposes (usually construction-related), and has also historically played a significant role in
gold mining. Dredging can create disturbance in
aquatic ecosystems, often with adverse impacts.
Contents
Uses
Capital: dredging carried out to create a new
harbour,
berth or
waterway, or to deepen existing facilities in order to allow larger ships access. Because capital works usually involve hard material or high-volume works, the work is usually done using a cutter suction dredge or large trailing suction hopper dredge, but for rock works drilling and blasting along with mechanical excavation may be used.
Preparatory: work and excavation for future
bridges,
piers or
docks/
wharves, often connected with
foundation work.
Maintenance: ...
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