![]() This water depth continues to increase over time as larger and larger ships are deployed. Vessels require a certain amount of water in order to float and not touch bottom. It is a routine necessity in waterways around the world because sedimentation-the natural process of sand and silt washing downstream-gradually fills channels and harbors.ĭredging often is focused on maintaining or increasing the depth of navigation channels, anchorages, or berthing areas to ensure the safe passage of boats and ships. The resulting contaminants then need to be reduced, removed or immobilised, after which even this dredged material can potentially be considered as a resource.Dredging is the removal of sediments and debris from the bottom of lakes, rivers, harbors, and other water bodies. Contaminated dredged material can be separated into a usable sand portion and a contaminated silt portion in separation fields or by dewatering or in hydrocylones. When dredged materials are lightly contaminated, direct use may still be an option if the environmental risks are low, taking site-specific conditions into account.Ī relatively small percentage of dredged material is heavily contaminated, but even for these materials, treatment is an option. Mixed materials are somewhat more restricted in use options but may still be used for fill, land improvement and topsoil.Silt and soft clay usually come from maintenance dredging, are rich in nutrients and thus are good for agricultural purposes such as topsoil and for wildlife habitat development. ![]()
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