Blar i NTNU Open på forfatter "Fossum, Trygve Olav"

Viser treff 1-17 av 17

    • Adaptive Sampling for Marine Robotics 

      Fossum, Trygve Olav (Doctoral theses at NTNU;2019:196, Doctoral thesis, 2019)
      Maintaining a healthy ocean is of the utmost importance. Having only a limited set of resources available to study this vast domain requires research and science to focus on more efficient data collection. Determining when ...

    • Adaptive Sampling of Ocean Processes Using an AUV with a Gaussian Proxy Model 

      Berget, Gunhild Elisabeth; Fossum, Trygve Olav; Johansen, Tor Arne; Eidsvik, Jo; Rajan, Kanna (Journal article; Peer reviewed, 2018)
      This paper presents methods for building and exploiting compact spatial models on board an autonomous underwater vehicle (AUV) towards tracking suspended material plumes. The research is aiming to improve real-time monitoring ...

    • Adaptive Sampling of Surface Fronts in the Arctic Using an Autonomous Underwater Vehicle 

      Fossum, Trygve Olav; Norgren, Petter; Fer, Ilker; Nilsen, Frank; Koenig, Zoe Charlotte; Ludvigsen, Martin (Peer reviewed; Journal article, 2021)
      Fronts between Arctic- and Atlantic-origin waters are characterized by strong lateral gradients in temperature and salinity. Ocean processes associated with fronts are complex with considerable space and time variability. ...

    • Analysis and control of drilling riser dynamics in dual gradient drilling 

      Fossum, Trygve Olav (Master thesis, 2013)
      The aim of this thesis is to investigate a dual gradient riser system, adapted for operations in the Gulf of Mexico and subjected to first- and second-order wave forces, current and rig/vessel motion.Deep water drilling ...

    • Autonomous Optical Survey Based on Unsupervised Segmentation of Acoustic Backscatter 

      Sture, Øystein; Fossum, Trygve Olav; Ludvigsen, Martin; Syre Wiig, Martin (Journal article, 2018)
      The application of acoustics to study the seabed have for decades provided industry and science with valuable information, and is still excels in terms of spatial coverage and detail. An acoustic response from the seabed ...

    • Autonomous Optical Survey Based on Unsupervised Segmentation of Acoustic Backscatter 

      Sture, Øystein; Fossum, Trygve Olav; Ludvigsen, Martin; Syre Wiig, Martin (Chapter, 2018)
      The application of acoustics to study the seabed have for decades provided industry and science with valuable information, and is still excels in terms of spatial coverage and detail. An acoustic response from the seabed ...

    • AUV mission planning for Multiple Vehicles using Adaptive sampling 

      Alnæs, Fredrik Elgsaas (Master thesis, 2020)
      Flere AUV-er brukes i dag i prøvetaking av havet for å studere hvordan marint liv i havet påvirkes av endringer på grunn av havfenomener som havfronter eller eddier. Havprøvetaking er ofte avhengig av forhåndsprogrammerte ...

    • Compact models for adaptive sampling in marine robotics 

      Fossum, Trygve Olav; Ryan, John; Mukerji, Tapan; Eidsvik, Jo; Maughan, Thom; Ludvigsen, Martin; Rajan, Kanna (Journal article; Peer reviewed, 2019)
      Finding high-value locations for in situ data collection is of substantial importance in ocean science, where diverse bio-physical processes interact to create dynamically evolving phenomena. These cover a variable spatial ...

    • Computer Vision Based Obstacle Avoidance for a Remotely Operated Vehicle 

      Brusletto, Lars Sletbakk (Master thesis, 2016)
      Remotely Operated Underwater Vehicle (ROV) has been operating for many years. The use of ROV is increasing with the increased activities in sub-sea operations. These operations are today dominated by oil and gas offshore ...

    • Contrasting phytoplankton-zooplankton distributions observed through autonomous platforms, in-situ optical sensors and discrete sampling 

      Fragoso, Glaucia Moreira; Davies, Emlyn John; Fossum, Trygve Olav; Ullgren, Jenny; Majaneva, Sanna; Aberle-Malzahn, Nicole; Ludvigsen, Martin; Johnsen, Geir (Peer reviewed; Journal article, 2022)
      Plankton distributions are remarkably ‘patchy’ in the ocean. In this study, we investigated the contrasting phytoplankton-zooplankton distributions in relation to wind mixing events in waters around a biodiversity-rich ...

    • Design og implementering av et UUVsystem for detaljert kartlegging av havbunnen 

      Halle, Jonas (Master thesis, 2023)
      I takt med økende fokus på bærekraftig industri og utnyttelse av havressurser, har behovet for mer effektive metoder for detaljert kartlegging av havbunnen økt. Dette har særlig betydning for lokalisering av fiskeoppdrett ...

    • Information-driven robotic sampling in the coastal ocean 

      Fossum, Trygve Olav; Eidsvik, Jo; Ellingsen, Ingrid H.; Alver, Morten; Fragoso, Glaucia Moreira; Johnsen, Geir; mendes, renato; Ludvigsen, Martin; Rajan, Kanna (Journal article; Peer reviewed, 2018)
      Efficient sampling of coastal ocean processes, especially mechanisms such as upwelling and internal waves and their influence on primary production, is critical for understanding our changing oceans. Coupling robotic ...

    • Learning excursion sets of vector-valued Gaussian random fields for autonomous ocean sampling 

      Fossum, Trygve Olav; Travelletti, Cedric; Eidsvik, Jo; Ginsbourger, David; Rajan, Kanna (Journal article, 2021)
      Improving and optimizing oceanographic sampling is a crucial task for marine science and maritime resource management. Faced with limited resources in understanding processes in the water column, the combination of statistics ...

    • NTNU-FFI Cruise 2017 - Hugin Autonomy Integration (DUNE, T-REX) 

      Sture, Øystein; Syre Wiig, Martin; Fossum, Trygve Olav (NTNU Cruise reports;, Research report, 2017)
      The following report describes the integration of a dedicated autonomy co-processor on FFI Hugin HUS. The integration was experimentally validated during a joint FFI-NTNU cruise in November 2017. The cruise in its entirety ...

    • Observations of Turbulence at a Near-Surface Temperature Front in the Arctic Ocean 

      Koenig, Zoé Charlotte; Fer, Ilker; Kolås, Eivind; Fossum, Trygve Olav; Norgren, Petter; Ludvigsen, Martin (Peer reviewed; Journal article, 2020)
      High‐resolution ocean temperature, salinity, current, and turbulence data were collected at an Arctic thermohaline front in the Nansen Basin. The front was close to the sea ice edge and separated the cold and fresh surface ...

    • Physical controls on phytoplankton size structure, photophysiology and suspended particles in a Norwegian biological hotspot 

      Fragoso, Glaucia Moreira; Davies, Emlyn John; Ellingsen, Ingrid H.; Chauton, Matilde Skogen; Fossum, Trygve Olav; Ludvigsen, Martin; Steinhovden, Kristine; Rajan, Kanna; Johnsen, Geir (Peer reviewed; Journal article, 2019)
      The impact of the physical environment and phytoplankton size on particle types (zooplankton, biogenic matter or phytodetritus) in the water column is poorly understood. Here, we investigate how hydrography (e.g. water ...

    • Toward adaptive robotic sampling of phytoplankton in the coastal ocean 

      Fossum, Trygve Olav; Fragoso, Glaucia Moreira; Davies, Emlyn John; Ullgren, Jenny; Mendes, Renato; Johnsen, Geir; Ellingsen, Ingrid H.; Eidsvik, Jo; Ludvigsen, Martin; Rajan, Kanna (Journal article; Peer reviewed, 2019)
      Currents, wind, bathymetry, and freshwater runoff are some of the factors that make coastal waters heterogeneous, patchy, and scientifically interesting—where it is challenging to resolve the spatiotemporal variation within ...