Blar i NTNU Open på forfatter "Sigtryggsdottir, Fjola Gudrun"

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    • 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 ...

    • 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 ...

    • Description of failure mechanism in placed riprap on steep slope with unsupported toe using smartstone probes 

      Hiriyanna Rao Ravindra, Ganesh; Gronz, Oliver; Dost, Bastian; Sigtryggsdottir, Fjola Gudrun (Peer reviewed; Journal article, 2020)
      This article is aimed at investigating the influence of toe support conditions on stability aspects of placed ripraps on steep slopes exposed to overtopping flows. All past experimental model studies investigating placed ...

    • Effects of toe configuration on throughflow properties of rockfill dams 

      Kiplesund, Geir Helge; Hiriyanna Rao Ravindra, Ganesh; Rokstad, Marius Møller; Sigtryggsdottir, Fjola Gudrun (Peer reviewed; Journal article, 2021)
      Rockfill dams must be equipped with defence mechanisms to counteract the destabilizing effects of throughflow forces under accidental leakage scenarios. A key component of the rockfill dam overtopping system is the rockfill ...

    • Gravity Dams on Karst foundation 

      Habib, Habibullah Khan (Master thesis, 2018)
      Foundations with dissolvable limestone possess difficult situation for the dams. Several dams around the world are either abandoned and never used such as Anchor Dam (USA) or requires continuous maintenance e.g Mosal dam ...

    • Landslide generated waves in dam reservoirs - Experimental investigation on a physical hydraulic model 

      Ponziani, Lorenza; Gardoni, Martina (Master thesis, 2017)
      The impulse waves generated by landslides that occur in an artificial basin may have disastrous impacts on the surrounding environment. For Alpine lakes, impulse waves are particularly significant, because of steep shores, ...

    • Load and Deformation Relations of Placed Riprap Model with Toe Support 

      Dezert, Theo; Ravindra, Ganesh Hiriyanna Rao; Sigtryggsdottir, Fjola Gudrun (Chapter, 2022)
      Abstract: Rockfill dams are hydraulic structures of major importance that can be exposed to extreme flood events, leading to overtopping processes. These phenomena erode and weaken their structural and geotechnical stability. ...

    • Load measurements at riprap toe. 

      Opare, Kofi Ntow (Master thesis, 2018)
      Riprap is widely used as slope protection and when placed on the downstream slope of a rockfill dam, it provides erosion resistance under overflow conditions. For steep downstream slopes (S > 50%), initiation of riprap ...

    • Miljølaster og erosjonsskader på fyllingsdammer i Norge 

      Bjørsom, Tiril Berg (Master thesis, 2020)
      Målet for denne oppgaven er å få mer kunnskap om miljølaster på norske fyllingsdammer og hvorvidt slike laster påvirker drift av dammene, for eksempel ved rehabiliteringstiltak, og/eller damsikkerheten, samt om våre ...

    • Numerical Modeling of the Effects of Toe Configuration on Throughflow in Rockfill Dams 

      Smith, Nils Solheim; Hiriyanna Rao Ravindra, Ganesh; Sigtryggsdottir, Fjola Gudrun (Peer reviewed; Journal article, 2021)
      The rockfill toe structure situated within the downstream slope of rockfill dams is an integral part of a defense mechanism safeguarding the dam structure in throughflow situations. Recent studies have concluded that the ...

    • Overtopping of embankment dams from landslide generated waves 

      Biedermann, Joël (Master thesis, 2017)
      A landslide entering a reservoir transforms its kinetic energy into an impulse wave. This wave propagates across the basin, runs up the shores and may overtop the dam. The consequences of such event are damages to nature ...

    • Physical model study on discharge over a dam due to landslide generatedwaves 

      Tessema, Netsanet; Sigtryggsdottir, Fjola Gudrun; Lia, Leif; Jabir, Asie (Peer reviewed; Journal article, 2020)
      Impulse waves generated by landslides falling into reservoirs may lead to overtopping of a dam and, in turn, to flooding of the downstream area. In the case of an embankment dam, the overtopping may lead to erosion of the ...

    • Placed Riprap Deformation Related to Axial Load at Toe Support: Physical Modelling 

      Dezert, Theo; Ravindra, Ganesh Hiriyanna Rao; Sigtryggsdottir, Fjola Gudrun (Peer reviewed; Journal article, 2022)
      Rockfill dams are hydraulic structures of major importance. They can be exposed to extreme flood events, in turn leading to overtopping. These phenomena erode and affect structural and geotechnical integrity, which in turn ...

    • Plastring av fyllingsdammer - Modellforsøk, praktiske forhold og avvik fra regelverk 

      Veslegard, Guri Holte (Master thesis, 2017)
      Formålet med masteroppgaven er å undersøke plastring utsatt for overtopping, teoretisk bakgrunn for valg av steinstørrelse og undersøke hvilke forhold som påvirker valg av steinstørrelse under bygging av plastring i felt. ...

    • Riprap Protection Exposed to Overtopping Phenomena: A Review of Laboratory Experimental Models 

      Dezert, Theo; Kiplesund, Geir Helge; Sigtryggsdottir, Fjola Gudrun (Peer reviewed; Journal article, 2022)
      There are increasing demands from dam safety regulations and guidelines to upgrade the rockfill dams, especially in Norway where over 180 large rockfill dams are present. To protect the hydraulic structure against overtopping ...

    • Riprap to resist wave and ice loads acting on the upstream slope of an embankment dam 

      Sigtryggsdottir, Fjola Gudrun (Chapter, 2020)
      In areas with cold climate formation of ice cover on a reservoir exerts loads on the upstream slope of an embankment dam which can cause degradation and erosion damages. Riprap is generally provided on the upstream slope ...

    • Seismic analysis of asphalt core rockfill dams. The case of the proposed Cetin Dam in Turkey 

      Kaygisiz, Haci Hasan (Master thesis, 2018)
      The seismic performance of the proposed Cetin dam with asphalt concrete core has been evaluated using the pseudo-static method, the Newmark displacement analysis-rigid method, and the non-linear numerical analysis. The ...