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What is Dredging?

11/8/2013 7:53:34 AM | by Anonymous


Dredging is an excavation operation or activity that carried out in the underwater and this is usually carried out in the fresh water areas or in shallow seas with the purpose of gathering up bottom sediments and disposing them at a different location. The most common technique is to keep waterways navigable.


They are also used as a way to replenish sand on some beaches where sand have been lost because of the coastal erosion. Dredging is used as a technique for fishing for certain species of edible crabs and clams as well as see fishing dredge.


A dredge is any machine, device or vessel that is used to remove and excavate material from the bottom of a body of water. For example, a scoop that is attached to the end of a pole or rope by which a man can draw sediments up from the bottom of a pond is a dredger.


By developing this idea further, a motorized crane must be equipped with a drag bucket or clamshell grabber that is used to scoop material from the bottom of body water is also called a dredger. The crane should be mounted on a barge or perhaps located on the bank and if the crane is mounted on a barge, the entire vessel can be referred to as a dredger.


The process of dredging can create excess material that are spoiled and carried away from the dredged area. In addition, dredging can produce materials for land reclamation or some other purposes that are usually construction related and has historically played a significant role in gold mining. Dredging can also create disturbance in aquatic ecosystems that are often with adverse impacts.


Dredging of material can be done either mechanically or hydraulically. The hydraulic dredges can use the hydraulic pumps to produce slurry of the dredged material and are used when there is material that needed to be removed. It can also be easily transported for long distances via a pipeline attached to the dredge.


Sometimes the cutter head is attached to the dredge intake to loosen hardened material. As for the mechanical dredge, it is to remove the sediments via mechanical methods such as backhoes, grab dredges or bucket ladder dredges. The removed material is placed into a barge which transports the material to its final destination.


This dredged material is sometimes placed into a specific engineering designed area that contains the material called confined disposal facilities however these structures are very costly and large to construct. These days, ports and harbor facility managers try to place only contaminated material into the confined disposal facilities while this can benefit the use of the uncontaminated material for other types of projects which include habitat restoration or creation, construction projects, soil amendments, landfill and landfill cover material and many other reuse applications.


Furthermore, this can save not only valuable space in the confined disposal facilities for the contaminated material but can also benefit the harbor and port region economically and environmentally by realizing that the dredged material can be a valuable resource and not just a waste material.

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