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A grab dredge. Dredging is the excavation of material from a water environment. 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.
Dredge plume evolution—how large it becomes, where it moves, how long it lasts, where its constituent materials settle—can be modeled, albeit imperfectly. Examples of such models include DREDGEMAP, [3] the MMS Dredge Plume Model and the Delft3D Suite. The result of years of research and engineering, such models are important tools to help ...
Boskalis Westminster N.V. is a Dutch dredging and heavylift company that provides services relating to the construction and maintenance of maritime infrastructure internationally. [2] The company has one of the world's largest dredging fleets, a large stake in Smit International and owns Dockwise, a large heavylift shipping company. [3]
In addition, almost all of the shipping companies that use Melbourne's ports stated that there was no need for dredging or channel deepening in the bay or around the ports. [citation needed] The government announced the completion of works in November 2009, ahead of schedule and $200 million under budget. [6]
It is then deposited in a hopper in the middle of the ship. When the hopper is full, the ship sails to an offshore location and opens doors in the bottom of the hopper, allowing the dredge spoil to fall to the sea bottom. [6] It typically takes 35 minutes of dredging to fill the ship's hopper to capacity. [11]
The ship which can hold up to 300 cubic metres or 500 tons of dredged material, has a set of 8 openable hopper bottom doors for disposal of dredged material out at sea. [3] The main equipment of the ship is a 320-HP Cummins-855-powered forward-mounted crane supplied by Titagarth Wagons. The crane’s 15.2-meter boom has a working radius of 12 ...
The ship's dragheads are 6 metres (19.7 ft) wide and can dredge between 55 metres (180 ft) and 160 metres (520 ft) deep. The ship has three hopper discharge options of pumping ashore by pipeline, dumping through bottom doors or rainbowing. [2] The ship has equipment to dredge almost any material; such as clay, silt, sand and rock.
The landlord business model in which: “the port is an entity that owns the port infrastructure and has agreements with third party operators”; The integrated model in which “the port is itself an operator that provides all cargo handling services”; and