![]() ![]() ![]() ![]() Other dredgers which do not fit into the above two categories.Hydraulic dredgers which work on the principle of adding large amounts of process water to change the original structure of the sediments, and.Mechanical dredgers which are suited for working in confined areas and are useful for removing the hand-packed material or debris,.In all but a few situations the excavation is undertaken by a specialist floating plant, known as a dredger.ĭredging is carried out in many different locations and for many different purposes, but the main objectives are usually to recover material of value or use, or to create a greater depth of water. Dredges have been classified as suction or mechanical.ĭredging has significant environmental impacts: it can disturb marine sediments, leading to both short- and long-term water pollution, destroy important seabed ecosystems, and can release human-sourced toxins captured in the sediment.īroadly the types of dredgers are classified into three categories (On the basis of the method employed for transportation, of dredged material from the bottom of the sea to the surface of the water): Possible reasons for dredging include improving existing water features reshaping land and water features to alter drainage, navigability, and commercial use constructing dams, dikes, and other controls for streams and shorelines and recovering valuable mineral deposits or marine life having commercial value. Reclamation of areas damaged by oil spills or natural calamitiesĪlthough dredging can have very harmful effects on the marine and aquatic environment, in some situations it may be the only option available.Removal of contaminants from the sea bed.for replenishing the sand on public beaches which might have undergone severe coastal erosion.making the water navigation or fishing easier in shallow waters. ![]()
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