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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.
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 ...
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.
No gold was found but the company's equipment proved useful for dredging of harbours and docks; [3] the company pioneered the manufacture of steam powered cranes with grab (clamshell) buckets. [4] From 1888 to 1904 the company produced various versions of the Priestman Oil Engine, an early example of an internal combustion engine. [5]
Duchess on right, Mud Lark (clam-shell dredge), on left, upper Columbia River, ca 1895. The upper Columbia was choked with snags, which were sunken logs jammed in the river bottom and sticking into the river. These could be significant barriers to navigation, as shown by the 23 days it took Clive to travel the 100 miles (160 km) up to ...
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Clamshell buckets from a retired coal-loading crane, now displayed at a dock re-development in Cardiff The clamshell bucket is a more sophisticated articulated several-piece device, including two elementary buckets associated on a hinged structure forming a claws-like appendage with an internal volume.
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