Dredged definition12/5/2023 Ultimately disposal barges or dump scows empty the material at the disposal area. The rotating cutter-bar uses its sharp blades to loosen the sediment on the bottom, and it is sucked in using a submersible pump. The dredge operator lowers it to the side of the body of water or its bottom. It involves excavating either naturally deposited sediments or artificial debris such as rocks, bottom sediments, construction debris, refuse, and plant or animal matter on the bottom of either shallow seawater or freshwater. Once the hoppers are full, the process is halted for a while, and the ship travels to the water disposal site, where the unwanted sediments are released through the bottom of the ship. A cost/benefit analysis is advised: evaluating the benefits to be gained or the impacts associated with the excavation process and materials excavated.Dredging removes the deposits percolated underwater to clear the water pathway for ships to pass, creates adequate space to construct important bridges, dykes and dams and weed out silt, intoxicants and pollutants from the bottom of the water. The transportation and placement phases require equal consideration and emphasis in the planning stages. The next steps are transport of these materials and finally the placement or disposal of the materials depending on the type of material and whether it is clean or contaminated. Transporting and placing dredged materialĮxcavation is, however, only the first phase of the dredging process. Since visibility is limited, sophisticated technologies have been developed to visualise and guide the work. Underwater technologiesĭredging excavation occurs underwater, often in deep water, where the process cannot be seen. To define the quantity or area to be dredged, acoustic sounding techniques are often used.Įnvironmental impact assessments are also a crucial part of project planning for dredging. These help the client and contractor to understand the nature of the materials to be dredged. Most projects require extensive pre-dredging preparation including a variety of bathymetric, geological and geophysical analyses. Planning, design, constructionĭredging requires thorough planning, design and construction, which involve engineers, scientists and highly trained crews representing a wide range of skills. Modern dredging vessels and technologies can collect and transport large quantities of sand to improve and expand existing ports, and to build land reclamations, which form platforms for offshore airports, residential and commercial areas. Maritime Infrastructureĭredging is used to address a broad range of maritime infrastructure needs – with economic, social and environmental implications.ĭredging deepens ports and access channels to accommodate global waterborne freight transport of goods.ĭredging also excavates or ‘mines’ sand from far offshore and then transports these materials to onshore locations where they are used to replenish eroded beaches and rebuild coastlines for protection of low-lying areas. Sand excavated from the ocean is used for beach restoration and land reclamation. This includes both the excavation and removal of a variety of materials – sediment, sand, rock and debris – from waterways, such as harbours, ports, lakes and rivers, usually for the purpose of deepening or cleaning them.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |