Deira was constructed by Van Oord between 2005 and 2008. Deira Islands will become a new 15.3 km2 waterfront city in Dubai. Part of the new scope is building a 23.5 km coastline and breakwaters. The two-year contract covers 8.5 km of beaches, 3.5 km of quay walls and 9.5 km of rock revetments at two of the four Deira Islands. The work includes a 4 km stretch of waterfront, big enough to accommodate more than 500 yachts and boats, at the 4.5 km2 south island. Van Oord will also construct 2 km of breakwaters to protect the newly-created basin and beachfront. The total contract value amounts to approximately EUR 100 million.
2 Cutter Suction Dredgers
Van Oord will deploy two cutter suction dredgers. A cutter suction dredger is a stationary or self-propelled vessel that uses a rotating cutter head to loosen the material in the bed (‘cutting’).
A suction inlet located beneath the cutter head (known as the suction mouth) is connected by a suction tube directly to one or more centrifugal pumps. The vacuum force at the suction inlet sucks up the loosened material. The suction tube and cutter head are attached to a ladder. The ladder with cutter head is positioned at the fore of the vessel.
On the aft side, the cutter generally has two spud poles. One spud pole (the auxiliary spud) passes straight through the vessel, while the other is mounted on a movable spud carriage, which can be moved lengthwise along the vessel or pontoon. Steel cables are used to move the ladder or cutter head back and forth, with the spud in the spud carriage as the centre of each concentric circle that it describes. Moving the spud carriage causes the cutter suction dredger to move as well (‘stepping’). The cutter suction dredger discharges the dredged material directly to shore via a floating pipeline or into a barge with a special loading system.
Nakheel has previously engaged van Oord for dredging and coastal work on its world-famous and iconic waterfront projects, including Palm Jumeirah and The World which added 300 km to Dubai’s coastline. The project will transform Dubai’s Deira district into a world-class hub for tourism, living, retail and entertainment.
Source: Van Oord