To main content

Riverbed and slope protection, Gbaran Ubie

The Shell Petroleum Development Company of Nigeria Limited (SPDC) has constructed a gas processing facility in the Niger Delta on the outside bank of a bend of the River Nun at Gbaran Ubie, north of Yenagoa. To facilitate the importation of the processing modules, a Materials Offloading Quay was constructed, including a ro-ro ramp, a passenger jetty and a fire water station.

River bed protection in front of the quay wall and slope protection on the north and south sides of the quay wall was required to prevent scour by the flow of the river and propeller wash from vessels using the quay wall.

Design of river bed and slope protection

The original design of the river bed and slope protection consisted of Reno mattresses placed on a geotextile, which at the time was considered the preferred option with the aim of reducing rock quantities. However, following a design review by Hydronamic, the Boskalis Engineering Department, and given the technical construction considerations recommended by the Boskalis Rock Department, SPDC later agreed to change the design of the bed protection along the quay wall and slope protection below the LWL along the South Bank, and to install protection consisting of rock armor on a granular filter layer rather than Reno mattresses.

Cooperation Pelfaco Limited and NWDM

SPDC awarded the contract for the river bed and slope protection to Pelfaco Ltd. In early January 2011, NWDM was asked to work with Pelfaco as a sub-contractor in order to ensure that the most critical parts of the site at least would be protected before the next rainy season of 2011. Following the successful completion of these emergency works the cooperation was further extended until the whole of the river bed protection along the quay wall and the slope protection on the South Bank was completed.

Related projects

Selected filters

Shell Malikai

Malikai is a deepwater oil discovery in offshore Sabah, Malaysia where Sabah Shell Petroleum Company is the designated Operator. A floating Dry Tree Unit (DTU) will be installed over Malikai field utilizing a Tension Leg Platform (TLP) design that suits the Malikai environment.

FF66817_header.jpg

Coastal development, Hondsbossche and
Pettemer Sea Defense

A joint venture of Boskalis Nederland and Van Oord has been commissioned by the Hollands Noorderkwartier water control board to reinforce the Hondsbossche and Pettemer Sea Defense between the villages of Petten and Camperduin on the coast of the Dutch province of Noord-Holland.

Cornelis_Zanen.jpg

Maintenance dredging, Yangon River

Located close to the city centre on the Yangon River, Yangon Port has been the main port to Myanmar since colonial times. Currently, the port has capacity for vessels of up to 15,000 –20,000 DWT and works are scheduled to increase the port’s capacity for vessels up to 35,000 DWT.

Gabon_Libreville1920.jpg

Port development,
Libreville - Gabon

A new area was constructed in the Port of Libreville for a mineral terminal, dry dock, fishing port, processing facilities and other port activities, such as aggregate processing. This new port development was required to improve and strengthen the logistic capacity for the inland mining industry, to reduce export costs, and thus to increase the competitiveness of mineral exports from Gabon.

Butendiek OWF

Boskalis was contracted by OWP Butendiek GmbH & Co. KG to supply, install and protect (by post-lay burial) the high-voltage inter-array cable at the offshore wind farm of Butendiek. This German wind farm is situated in the German Bight (Nordsea), approx. 35 km west of the island of Sylt. The 33 km2 wind farm consists of 80 wind turbines with a capacity of 3.6 MW each and a total capacity of 288 MW. The inauguration of the wind farm took place on September 8, 2015. It provides renew-able energy to approx. 370,000 households.

IMG_3549_header.jpg

Cleanup sediment treatment, Fox river

As a result of industrialization the riverbed of the Fox River (Wisconsin, USA) had become contaminated with PCBs (polychlorinated biphenyls). Joining together a number of large paper mills based on the banks of the river have established the Fox River Cleanup Group to handle the remediation project. The site is on the federal Superfund program’s National Priorities List.