SECTOR: Urban Construction & Geohazard

Gilhusbukta, Norway


Seabed subsidence monitoring

The Fjordbyen project, or Fjord City, is a large-scale, multi-year land development and reclamation project in Gilhusbukta, Norway. The project will move 4.8 million tonnes of rock mass into the Gilhuskukta Bay of the Drammmensfjord, allowing the construction of civil infrastructure like a public transportation hub, a hospital, and housing for 20,000 people. As a busy shipping port, Gilhusbukta was one of Norway’s most polluted industrial sites, where significant amounts of oil, tar, and creosote had leaked into the fjord. In order for the land in the Drammmensfjord Bay to be safe for construction, tonnes of rock fill had to be dredged from the sea bed and washed of contaminants before deposit back into the seabed [1].

Cautus Geo, a monitoring system integrator and long-time Measurand distributor, was responsible for monitoring the site. To monitor the length of Gilhusbukta Bay, Cautus Geo installed SAAX-type ShapeArray in long trenches dug across the bay in the seabed. Using Cautus Web, Cautus Geo’s own software platform, the data of three distinct SAAX-type ShapeArrays were combined into a single, seamless profile of the seabed. Three profiles made of nine SAAX-type ShapeArrays in total were trenched into the seabed to establish automated subsidence monitoring before million of tonnes of rock fill was dumped into the bay. The longest settlement profile out of the three measured 330 metres long.

In addition to ShapeArray, Cautus Geo has installed 27 piezometers at nine different locations–the deepest are more than 50 metres below the seabed.

“It is important for our customer to have full documentation on the settlements to ensure that the ‘new ground’ is stable and suitable for building,” Atle Gerhardsen, Cautus Geo CEO, said.

Cautus Geo used a battery-operated Data Acquisition System to collect and send to data from the ShapeArray and piezometer installations to Cautus Web. All monitoring data at the site can be used by Cautus Web to quickly present, analyze, and set alarm thresholds to notify project stakeholders of movement via email and SMS message.


A. Karlsvik, “Environmental Dredging: The SeaBed Way,” in Seventh International Conference of Remediation of Contaminated Sediments, Dallas, Texas, 2013.

"It is important for our customer to have full documentation on the settlements to ensure that the 'new ground' is stable and suitable for building," Atle Gerhardsen, Cautus Geo CEO, said.
Atle Gerhardsen
Cautus Geo, CEO
  • 1993

    The Beginning

    Measurand is established in Fredericton, New Brunswick
  • 1994

    Bend sensor development

    Measurand develops and patents fiber optic bend and position sensors for the medical and automotive sectors

    U.S. Patent 5,321,257

  • 1995

    Canadian Space Agency

    Receives funding from the CSA to develop sensor technology that ultimately leads to invention of ShapeTape

    U.S. Patent 5,633,494

  • 1999

    Patent on fiber optic sensor

    Measurand receives patent for "Fiber Optic Bending and Positioning Sensor" issued June 29, 1999

    Canadian Patent 2,073,162

  • 2001

    ShapeTape & ShapeHand debut

    Measurand designs and develops innovative motion capture technology

    U.S. Patent 6,127,672, 6,563,107

  • 2002

    Measurand Attends the ICPMG

    First contact with the geotechnical sector at the International Conference on Physical Modelling in Geotechnics (ICPMG)
  • 2004


    Design patent application sent about a new product designed to meet the specific needs of the geotechnical industry

    U.S. Patent 6,127,672, 6,563,107

  • 2005-08


    Measurand debuts ShapeWrap motion capture technology for the film and animation industry

    U.S. Patent 7,296,363

  • 2006

    Malibu installation

    ShapeAccelArray installed for ground monitoring for the first time​ in Malibu, CA

    Canadian Patent 2,472,421

  • 2007


    Suite of instrumentation developed for motion capture within Magnetic Resonance Imaging (MRI) machines

    U.S. Patent 7,296,363

  • 2011

    SAAScan launched

    Built for rapid deployment and repeated use

    Canadian Patent 2,472,421

  • 2014

    SAAX launched

    Purpose-built for heavy-duty horizontal installation

    Canadian application 2,815,199 & 2,815,195

  • 2017

    SAAV launched

    The only geotechnical instrument with a patented cyclical installation method

    Cyclical Sensor Array, Canadian application 2,815,199 & 2,911,175