UAE U-7 Project

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Physical features of Persian Gulf

Physiography

The gulf is shallow, rarely deeper than about 300 feet (90 metres), although depths exceeding 360 feet (110 metres) are found at its entrance and at isolated localities in its southeastern part.

Geology

In this basin vast quantities of sediments accumulated—mostly limestone and marls (a mixture of calcareous and silicate mud), together with evaporites and organic matter.

Climate

The shamal, a wind that blows predominantly from a north-northwest direction during the summer, is seldom strong and rarely reaches gale force. Squalls and waterspouts are common in autumn, when winds sometimes reach speeds of 95 miles (150 km) per hour within as short a time as five minutes.

Hydrology

When onshore winds are strong, the level of the coastal waters, particularly in the southern gulf, may rise by as much as 8 feet (2.4 metres), causing extensive flooding of the low sebkhas. Tidal currents are strong (5 miles [8 km] per hour) at the entrance of the gulf but elsewhere—except between islands or in estuaries and lagoon entrances—rarely exceed one to 2 miles (3 km) per hour. The wind affects local currents and sometimes reverses them.

Waves rarely exceed 10 feet in height and are largest in the southern gulf.

All quoted from Encyclopedia Britannica.

Select the pens

Taking the physical features, maintenance and farming into full considerations, we selected HDPE C60 as pen facilities. Below are the key items for a single HDPE C60.

ID	Item	Specification	Unit	Quantity
1	Floating pipe	Φ315, SDR11, black	m	123.5
2	Handrail	Φ110, SDR11, yellow	m	60
3	Standing pipe	Φ125, SDR11, yellow	pcs	30
4	Bracket	Φ315, HDPE, black	pcs	30

Design the mooring and anchoring

Taking the physical features, construction, operation, water exchange and rough conditions into full considerations, we designed and recommended the individual mooring system. Below are the key items for the system.

ID	Item	Specification	Unit	Quantity
1	Cement block	3.5 t, 1.5 m³	pcs	8
2	Anchoring rope	Φ42 mm, polyethylene	pcs	8
3	Anchoring chain	Φ42 mm	pcs	8
4	Omega shackle	1 1/2 inch	pcs	16

Install and deploy

Positioning

Using GPS, drive the tugboat to the point, drop the sinker, and buoy as the first marker. Repeat the process and adjust the position if necessary. Make sure all the sinkers are placed exactly in the predesigned point.

Anchoring

Arrange construction and anchoring while the wind is favorable with slack water. Drive the tugboat to the predesigned point and deploy the cement block. Repeat the process until all blocks are done deploying.

Tying

After deploying all the cement blocks, trawl and drag the pen to the area. Tie and fix the pen with the ropes properly. After that, install the nets and keep the whole system running in a loading of 30 d.