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rainbowing
Rainbowing is the process in which a dredging ship propels sand that has been claimed from the ocean floor in a high arc to a particular location. This is used for multiple purposes, ranging from building up a beach to prevent erosion to constructing new islands. The name is derived from the appearance of the arc, which closely resembles a brown-colored rainbow.
This technique was used extensively in the construction of the Palm Islands and The World, Dubai.〔
==Process==
The process of rainbowing begins with the excavation of sediment, typically sand, from the seabed by a dredger. Dredgers excavate the sediment using mechanical or hydraulic methods or a combination of both. During the excavation process, large quantities of water are collected along with sediment creating a mixture called slurry. The slurry can then be utilised on-site or transported to where it will be deposited. The liquid characteristics of the slurry allow the dredger to transfer the slurry by ejecting it through the air in arcs.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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