Blar i NTNU Open på forfatter "Fjeldstad, Hans-Petter"

Viser treff 1-11 av 11

    • A modelling framework to support environmental design in regulated rivers 

      Bustos, Ana Adeva (Doctoral theses at NTNU;2019:141, Doctoral thesis, 2019)
      Despite the fact that environmental design and mitigation measures in regulated rivers have been widely applied in the last decades, yet it is still a challenge to find a method that supports a sustainable balance between ...

    • Atlantic Salmon Migration Past Barriers 

      Fjeldstad, Hans-Petter (Doktoravhandlinger ved NTNU, 1503-8181; 2012:128, Doctoral thesis, 2012)
      The Atlantic salmon depend on successful migration between essential habitats in freshwater and the ocean. However, during both downstream and upstream migration the fish encounter natural or manmade obstacles which can ...

    • Ecohydraulic Modelling to Support Fish Habitat Restoration Measures 

      Adeva Bustos, Ana; Alfredsen, Knut; Fjeldstad, Hans-Petter; Ottoson, Kenneth (Journal article; Peer reviewed, 2019)
      Despite that hydromorphological restoration projects have been implemented since the 1940s, the key to improve the effectiveness of future restoration measures remains a challenge. This is in part related to the lack of ...

    • Effektivitet og kost-nytte forhold av fysiske miljøtiltak i vassdrag 

      Pulg, Ulrich; Stranzl, Sebastian Franz; Espedal, Espen Olsen; Gabrielsen, Sven Erik; Postler, Christoph; Ugedal, Ola; Jensås, Jan Gunnar; Bremset, Gunnbjørn; Fjeldstad, Hans-Petter; Alfredsen, Knut (LFI - Laboratorium for ferskvannsøkologi og innlandsfiske;, Research report, 2020)
      Det er økt fokus på bedring av fysiske miljøforhold i vassdrag, og med dette har behovet for å kunne vurdere kostnader og nytte ved slike tiltak økt. Prinsippet om «positiv kost-nytte» legges eksempelvis til grunn ved ...

    • Experimental hydraulics on fish-friendly trash-racks: an ecological approach 

      Szabo-Meszaros, Marcell; Navaratnam, Christy Ushanth; Aberle, Jochen; Silva, Ana T.; Forseth, Torbjørn; Calles, Olle; Fjeldstad, Hans-Petter; Alfredsen, Knut (Journal article; Peer reviewed, 2018)
      The obstruction of fish migratory routes by hydroelectric facilities is worldwide one of the major threats to freshwater fishes. During downstream migration, fish may be injured or killed on the trash-racks or in the ...

    • Identification of salmon population bottlenecks from low flows in a hydro-regulated river 

      Adeva Bustos, Ana; Hedger, Richard David; Fjeldstad, Hans-Petter; Stickler, Morten; Alfredsen, Knut (Journal article; Peer reviewed, 2019)
      Flow regime alterations from hydropower regulation may impact fish populations. Impacts can be characterized using methods for mapping bottlenecks for different species life stages. Improving the understanding of such ...

    • Modeling the effects of alternative mitigation measures on Atlantic salmon production in a regulated river. 

      Adeva Bustos, Ana; Hedger, Richard David; Fjeldstad, Hans-Petter; Alfredsen, Knut; Sundt, Håkon; Barton, David Nicholas (Journal article; Peer reviewed, 2017)
      As part of the investigation of a new and optimized environmental flow regime in a regulated river (Mandalselva, Norway), a modeling study was conducted on the trade-offs between the production of Atlantic salmon (Salmo ...

    • Modelling mitigation measures for smolt migration at dammed river sections 

      Szabo-Meszaros, Marcell; Forseth, Torbjørn; Baktoft, Henrik; Fjeldstad, Hans-Petter; Silva, Ana T.; Gjelland, Karl Øystein; Økland, Finn; Uglem, Ingebrigt; Alfredsen, Knut (Journal article; Peer reviewed, 2019)
      There is no generic solution to establish safe passage of downstream migrating fish passed hydropower facilities and mitigation measures are species‐ and site‐specific. Development of solutions is thus often based on “trial ...

    • Multi-criteria decision analysis in Bayesian networks - diagnosing ecosystem service trade-offs in a hydropower regulated river 

      Barton, David Nicholas; Sundt, Håkon; Adeva Bustos, Ana; Fjeldstad, Hans-Petter; Hedger, Richard David; Forseth, Torbjørn; Köhler, Berit; Aas, Øystein; Alfredsen, Knut; Madsen, Anders L. (Journal article; Peer reviewed, 2019)
      The paper demonstrates the use of Bayesian networks in multicriteria decision analysis (MCDA) of environmental design alternatives for environmental flows (eflows) and physical habitat remediation measures in the Mandalselva ...

    • Optimising Atlantic salmon smolt survival by use of hydropower simulation modelling in a regulated river 

      Fjeldstad, Hans-Petter; Alfredsen, Knut; Boissy, Thibault (Journal article; Peer reviewed, 2014)
      Studies on downstream passage of diadromous fishes in northern Europe are rare, and in Norway, the problem is strongly linked to demands for efficient hydropower production. The current study explored mitigating measures ...

    • Validation of a Swimming Direction Model for the Downstream Migration of Atlantic Salmon Smolts 

      Szabo-Meszaros, Marcell; Silva, Ana T.; Bærum, Kim Magnus; Baktoft, Henrik; Alfredsen, Knut; Hedger, Richard David; Økland, Finn; Gjelland, Karl Øystein; Fjeldstad, Hans-Petter; Calles, Olle; Forseth, Torbjørn (Peer reviewed; Journal article, 2021)
      Fish swimming performance is strongly influenced by flow hydrodynamics, but little is known about the relation between fine-scale fish movements and hydrodynamics based on in-situ investigations. In the presented study, ...