Rainbowing - The Ultimate Sand Mining

Rainbowing is the act of dredging sand from sea or any deep area, for construction purpose. This process uses a dredging ship which propels sand from the deep sea, as easy as pouring gallons of water. This technique is usually used in constructing artificial archipelago or artificial Islands over the sea. The name "Rainbowing"  is derived from the appearance of the arc, which closely resembles a brown-colored rainbow.

Rainbowing

World renowned famous mega-structures the Palm Islands and The World, Dubai used this technique to build cities over the sea. These ships scoops up sand from sea bed, exhaust them through a pipe at speeds up to 10 m/s. Large quantity of water present along with the sand, gives the mixture (called Slurry) a huge thrust and can be propelled through a long distance as needed.

Palm Island and The World by Rainbowing Technique

Nozzle Angle: Nozzle angle is the rotation (angle) made by the nozzle of the dredger. Indeed this is an important consideration for the range the sand to be placed. The longest range is obtained at an angle of 45°. The same which we have noted in our daily outdoor games.

Environmental Effects : Dredging involves excavating very large amount of sand from the sea bed, causing imbalance and takes long time to settle back. This process, can cause plumes of fine sediment to remain suspended in water, affecting the ecosystem.

Watch working video of the dredger ship at http://youtu.be/5f3Hl3FzMxI