16 Oct 2014

Measuring hydrographic conditions for a 5 km floating structure in Norway

We will be in charge of measuring hydrographic conditions for work related to a new floating structure that will be built across the nearly 600 m deep Bjørnafjorden in Norway.

The NKR 38 million (EUR 4.6 million) Norwegian Public Roads Administration (NPRA) project will look at the feasibility of building a 5 km floating tunnel or floating bridge. The floating structure is necessary to fulfil Norway’s goal of creating a ferry-free highway connecting important economic centres like Stavanger, Bergen and Trondheim along the Norwegian west coast.

We will be responsible for measuring currents, waves and other hydrographic parameters throughout the entire water column across the two proposed structures. As floating tunnels and bridges are vulnerable to wave and current changes, the measurements will help the NPRA optimise the design as well as ensure the safety and stability of the structure.

The system will consist of:
  • five to seven buoys, each holding an upward looking Nortek AWAC Acoustic Doppler Current Profiler (ADCP) at 50 m depth
  • one buoy with a downward looking Nortek Signal 55 long range ADCP capable of measuring current velocities and direction down to 1,000 m (in 10 m intervals)
The buoys for the project will be in operation 23 December 2014. In addition to setting up and operating the measuring system, we will also conduct further Metocean-related engineering works for the planned structure. The project will initially run for two years, but could take up to five years.

Conceptual design of the measuring system