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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.
As an example, imagine dredging using a clamshell dredger, which deposits the dredged material on a barge that takes its load to a separate area and dumps it overboard. In this scenario, a dredge plume can be expected to begin at the bottom as the clamshell bucket stirs up loose material and sediment. As it rises through the water column to the ...
Mallard II moving mud, with its bucket outstretched. Mallard II is a wooden-hulled clamshell dredger [2] used to maintain levees on the San Francisco Bay Salt Ponds. [3] [4] Mallard II was constructed in 1936, [5]: 45 and is "probably the oldest operating dredge in California"; [6]: 51 she is owned and operated by Cargill Salt.
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A steam shovel excavating for the San Diego and Arizona Railway line, circa 1919.. Expanding railway networks (in the US and the UK) fostered a demand for steam shovels. The extensive mileage of railways, and corresponding volume of material to be moved, forced the technological leap.
The dredge is usually constructed from a heavy steel frame in the form of a scoop. The frame is covered with chain mesh which is open on the front, which is towed. The chain mesh functions as a net. Dredges may or may not have teeth along the bottom bar of the frame. In Europe, early dredges had teeth, called tynes, at the bottom. These teeth ...
Fishing boat deploying a clam dredge in nearshore waters in Cape May, New Jersey, United States of America. An 8 cm juvenile valve of Spisula solidissima Global capture production of Atlantic surf clam ( Spisula solidissima ) in thousand tonnes from 1950 to 2022, as reported by the FAO [ 7 ]
Yaquina hit an uncharted rock ledge while dredging a channel in the Umpqua River on July 27, 1990 which tore a 5-foot by 8-foot hole in its hull. Several compartments flooded and the ship settled into the mud. [18] She was towed to Portland for repairs. [27] She ran aground and was holed while dredging in Willapa Bay, Washington on August 9, 1997.
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