Browsing NTNU Open by Author "Lia, Leif"

Now showing items 1-20 of 123

    • Air return in brook intake shafts. 

      Perzyna, Stefan (Master thesis, 2017)
      In Norwegian practice, it is common to construct additional intakes (brook intakes) to collect the water from smaller streams and transport the water to the reservoir to increase the production of a hydropower plant. ...

    • Alkalireaksjon i betongdammar ved Tyinosen - Metode, resultat og tiltak 

      Rockland Aarethun, Kristen Johannes (Master thesis, 2019)
      Masteroppgåva tek føre seg ulike metodar for vurdering av alkalireaksjon i Tyin Dam 1, 2 og 3, med omsyn til levetid og tiltak. På nedstraumsside er dammane prega av rutemønstra oppsprekking, kalkutfellingar og lekkasjar. ...

    • AlternaFuture - Final Report 

      Vereide, Kaspar; Mo, Birger; Forseth, Torbjørn; Lia, Leif; Nysveen, Arne; Dahlhaug, Ole Gunnar; Schäffer, Linn Emelie; Bustos, Ana Adeva; Sundt-Hansen, Line; Øvregård, Eirik; Glimen, Pål; Hesthagen, Trygve; Skår, Margrete; Nielsen, Torbjørn Kristian (HydroCen Report;18, Research report, 2020)
      AlternaFuture has been a multidisciplinary research project in Hydrocen to investigate the potential of extreme upgrading of existing hydropower system with a positive effect on the environmental conditions. The project ...

    • Application of Three-Dimensional CFD Model to Determination of the Capacity of Existing Tyrolean Intake 

      Bor Turkben, Asli; Szabo-Meszaros, Marcell; Vereide, Kaspar Vatland; Lia, Leif (Journal article; Peer reviewed, 2024)
      CFD models of intakes in high-head hydropower systems are rare due to the lack of geometric data and cost of modeling. This study tests two different types of software to see how modeling can be performed in a cost-effective ...

    • Beregninger av hvelvdam med vederlagspilar 

      Åmås, Trond (Master thesis, 2015)
      Hvelvdammer har høy grad av statisk ubestemthet, og elementmetoden er derfor en egnet analysemetode. I denne oppgaven har man laget en skallmodell av en enkeltkrum hvelvdam med vederlagspilar i elementmetodeprogrammet ...

    • Breach Progression Observation in Rockfill Dam Models Using Photogrammetry 

      Kiplesund, Geir Helge; Sigtryggsdottir, Fjola Gudrun; Lia, Leif (Peer reviewed; Journal article, 2023)
      Dam failures are examples of man-made disasters that have stimulated investigation into the processes related to the failure of different dam types. Embankment dam breaching during an overtopping event is one of the major ...

    • Bruk av driftstunnel som magasin for kraftproduksjon 

      Berg, Tom Erik (Master thesis, 2019)
      Vasskraft er ein av Norges byggesteinar og kraft trengs over heile landet. Bygging av vasskraftanlegga må prosjekterast nøye, og det vil være mange moment som må vurderast opp mot kvart enkelt tilfelle for finne den mest ...

    • Buttresses on Flat-Slab Dams - Planning of Shear Tests 

      Nymo, Andre' (Master thesis, 2016)
      The shear strength of a bonded concrete-rock interface below a concrete dam consists of two parts: friction from the self-weight of the dam and cohesion due to the glue in the cement paste binding the surfaces together. ...

    • Buttresses on Flat-Slab Dams - Planning of Shear Tests 

      Nymo, Andre' (Master thesis, 2016)
      The shear strength of a bonded concrete-rock interface below a concrete dam consists of two parts: friction from the self-weight of the dam and cohesion due to the glue in the cement paste binding the surfaces together. ...

    • Case Study of Dam Overtopping from Waves Generated by Landslides Impinging Perpendicular to a Reservoir’s Longitudinal Axis 

      Tessema, Netsanet Nigatu; Sigtryggsdottir, Fjola Gudrun; Lia, Leif; Jabir, Asie Kemal (Journal article; Peer reviewed, 2019)
      Landslide-generated impulse waves in dammed reservoirs run up the reservoir banks as well as the upstream dam slope. If large enough, the waves may overtop and even breach the dam and cause flooding of the downstream area ...

    • CFD model simulations for the purpose of optimizing secondary intakes: Application of 3D CFD for intakes, optimization of an existing intake structure 

      Bor, Asli; Szabo-Meszaros, Marcell; Vereide, Kaspar; Lia, Leif (HydroCen Rapport;38, Research report, 2023)
      Secondary intakes, also known as brook intakes, are crucial for hydropower schemes in alpine regions with steep hills and a high number of tributaries. Brook intakes are normally a minor part of the total inflow and combined ...

    • Comparison of the Svee and Thoma Stability Criteria for Mass Oscillations in Surge Tanks 

      Leknes, Eirik (Master thesis, 2016)
      This thesis discusses two different criteria for the stability of surge tanks in hydropower plants. In 1910, the first stability criterion was derived by Dieter Thoma. This criterion sets a minimum cross-sectional area for ...

    • Comparison of the Svee and Thoma Stability Criteria for Mass Oscillations in Surge Tanks 

      Leknes, Eirik (Master thesis, 2016)
      This thesis discusses two different criteria for the stability of surge tanks in hydropower plants. In 1910, the first stability criterion was derived by Dieter Thoma. This criterion sets a minimum cross-sectional area for ...

    • Concrete Dams Constructed on Soil Materials 

      Bista, Dipen (Master thesis, 2015)
      Rock may not always be encountered at economical depth to have foundation dam on it. It is a typical situation in Nepal where several meters deep alluvium is expected before reaching competent rock. Several dams have been ...

    • Concrete Dams Constructed on Soil Materials 

      Bista, Dipen (Master thesis, 2015)
      Rock may not always be encountered at economical depth to have foundation dam on it. It is a typical situation in Nepal where several meters deep alluvium is expected before reaching competent rock. Several dams have been ...

    • Dam Runup and Overtopping from Waves Generated by Landslides 

      Tessema, Netsanet Nigatu (Doctoral theses at NTNU;2021:18, Doctoral thesis, 2021)

    • DAM STORLIVATNET FLOMLØP - MODELLFORSØK FOR NYTT FLOMLØP 

      Gjerde, Baard Aasmund Utvik (Master thesis, 2017)
      Med grunnlag i revurdering og nye flomberegninger for dam Storlivatnet i Sauda, må flomavledningskapasiteten økes for å tilfredsstille krav fra NVE. I den forbindelse skal det bygges en labyrintterskel med sidekanal og ...

    • Dam Strandevatn - Modellforsøk av nytt flomløp 

      Trongkleiv, Hans Erik (Master thesis, 2018)
      Etter revurdering av flomløpet og nye flomberegninger utført av Multiconsult i 2012 for dam Strandevatn i Hol er det bestemt at flomavledningskapasiteten må økes for å tilfredsstille kravene i damsikkerhetsforskriften. Det ...

    • DEBRIS HANDLING AT SMALL HYDRO POWER INTAKES 

      Holmeset, Fredrik (Master thesis, 2013)
      In this study the handling of debris in small hydro power intakes is assessed by evaluating the concept of back flushing with a horizontally fixed trash rack. The concept of back flushing is to reverse the flow over the ...

    • Design of a Surge Tank Throttle for Tonstad Hydropower Plant 

      Gomsrud, Daniel (Master thesis, 2015)
      The objective of this thesis has been to evaluate the effect of throttling the surge tanks at Tonstad Hydropower Plant, by the means of one-dimensional numerical modelling in the program LVTrans. The background of the ...