Wednesday 10 September 2014

Palm Islands

The Palm Islands are artificial peninsulas constructed of sand dredged from the bottom of the Persian Gulf by the Belgian company Jan De Nul and the Dutch company Van Oord.The sand is sprayed by the dredging ships, which are guided by DGPS, onto the required area in a process known as rain-bowing because of the arcs in the air when the sand is sprayed. The outer edge of each Palm's encircling crescent is a large rock Dubai Image Gallerybreakwater.
The breakwater of the Palm Jumeirah has over seven million tons of rock.

Each rock was placed individually by a crane, signed off by a diver and given a GPS coordinate. The Jan De Nul Group started working on the Palm Jebel Ali in 2002 and had finished by the end of 2006. The reclamation project for the Palm Jebel Ali includes the creation of a four-kilometer-long peninsula, protected by a 200-metre-wide, seventeen-kilometer long circular breakwater.
210,000,000 m3 of rock, sand and limestone were reclaimed (partly originating from the Jebel Ali Entrance Channel dredging works). There are approximately 10,000,000 cubic metres of rocks in the slope protection works.

Humble Beginnings

Originally a small fishing settlement on a Khor or Creek, Dubai was taken over by a branch of the Bani Yas tribe in about 1830. They had come from the Liwa Oasis in the far south of the present day United Arab Emirates, and were led by the Maktoum family, who still rule the emirate today.
Traditional activities included herding sheep and goats, cultivating dates, fishing and pearling. Pearling in particular gave Dubai's inhabitants a head start in building trade relations. By the turn of the century, the town was reputed to have the largest markets on the Gulf coast, with 350 shops in the Deira district alone.
Commercial success allied to the liberal attitudes of Dubai's rulers, made the emirate attractive to traders from India and Iran, who began to settle in the growing town. Dubai continued to take advantage of a regional maritime peace enforced by the British Navy in the area to forge strong sea-trading links with the states around it.

Federation

On the British withdrawal in 1971, Dubai came together with Abu Dhabi, Sharjah, Ajman, Umm Al Quwain, Fujairah and (in 1972) Ras Al Khaimah to create the federation of the United Arab Emirates. Abu Dhabi became the federal capital, while Dubai began to command the position of commercial centre.
This was shortly after the discovery of oil in 1966, which was soon to transform the emirate and its way of life. Dubai's first oil exports in 1969 were followed by a period of rapid development that laid the foundations for today's modern society. Much of the credit for this development are traced to the late Ruler, Sheikh Rashid bin Saeed Al Maktoum, who ensured that Dubai's oil revenues, despite being relatively modest by the regional standards, were deployed to maximum effect.
His work has been continued by the present Ruler, Sheikh Maktoum bin Rashid Al Maktoum, and his brothers, Sheikh Hamdan bin Rashid Al Maktoum, Deputy Ruler of Dubai and UAE Minister of Finance and Industry, and General Sheikh Mohammed bin Rashid Al Maktoum, Crown Prince of Dubai and UAE Minister of Defense. The result is that Dubai is constantly building up its infrastructure of transport facilities, schools, hospitals, tourism developments and other amenities of an advanced society

Palm Island Construction


Construction on the palm islands began in 2001. Divers surveyed the seabed and worke­rs constructed a crescent-shaped breakwater from blasted mountain rock. The Crescent of Palm Jumeirah stands a little more than 13 feet above low tide sea level and sits in 34 feet of water at its deepest point.
Sand, covered by an erosion-preventing water-permeable Geo-textile, makes up the breakwater's lowest layer. One-ton rocks cover the sand, and two layers of large rocks weighing up to six tons each cap the structure. A "toe" placed by a floating crane sits inside the Crescent. The breakwater also has two 328-foot openings on each side to eliminate stagnation in the 16 narrow, deep channels. These gaps allow water to completely circulate every 13 days.
­Although five workers were swept away­ by a wave and one drowned, the designers at Nakheel believe the breakwater will protect the palm island from average gulf weather and even an enormous storm. They even suggest that villas barely 10 feet above sea level will be safe from the rising seas of global warming.
The palm islands themselves are constructed from sand dredged from the sea floor. Palm Jumeirah is made from 3,257,212,970.389 cubic feet of ocean sand vi-bro-compacted into place [source: The Palm Jumeirah]. Vi-bro-compaction increases the density of loose sand by saturating it with jets of water and vibrating it with probes [source: Terra Systems].
To get the complex shape just right, designers and contractors use Differential Global Positioning Systems (DGPS) to plot the palm and ensure the sand placement within 0.39 of an inch.
Palm Jumeirah is already packed with villas and hotels, with some early buyers complaining that the plots are more closely spaced than they were led to believe. Buyers are a mixture of long-term residents, vacationers and speculators hoping to cash in on skyrocketing prices. When the island is complete, Nakheel expects 120,000 residents and workers plus as many as 20,000 tourists a day. Construction workers lived on the fronds and in anchored cruise ships while building the island.
­To facilitate tourism and make life easier for residents, the six-lane Sub-Sea Tunnel connects Palm Jumeirah to the mainland. Workers used a dam to drain the area and excavate the seabed before re-releasing the water. Developers have plans for a four-stop monorail that will race the length of the palm.
To learn more about the Palm Islands and Dubai, look over the links on the next page.

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