Blar i NTNU Open på forfatter "Rüther, Nils"
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Modelling complex rating curves with hydraulic scale models and computational fluid dynamics
Pedersen, Øyvind (Doctoral theses at NTNU;2018:220, Doctoral thesis, 2018)The Flom-Q research project aims to revise the framework for flood-estimation methods in Norway. Accurate rating curves are important for estimating flood discharges that are crucial input for any flood assessment task. ... -
Nedstrøms skråning av steinfyllingsdammer - modellforsøk av plastring under ulike strømningsforhold
Røer, Hans Edward (Master thesis, 2014)Formålet med denne masteroppgaven er å finne ut hvordan ulike strømningsforhold påvirker styrken av et plastret erosjonsdekke. Plastring er en metode å legge stein der steinene ligger stabilt og med god innbyrdes kontakt. ... -
New Techniques for Estimating Sediment Load for the Catchment of Banja HPP
Sørås, Sigurd (Master thesis, 2017)toring water in artificial reservoirs is a common method for ensuring constant water supply for among others irrigation, electricity and drinking water. The construction of such artificial storages will disturb the natural ... -
Numerical Modelling of Hydraulics and Sediment at the Headworks of Kali Gandaki A Hydropower Plant, Nepal
Shrestha, Sanjaya Dhonju (Master thesis, 2020)The Kali Gandaki A Hydropower Plant (KGA) has been facing issues related to unfavourable flow conditions at intake and settling basins, thereby hindering the efficient settling of the sediments, as realized from the excessive ... -
Numerical modelling of hydraulics and sediment at the inlet location of Sediment Bypass Tunnel (SBT) - Test Case: Upper Arun Hydroelectric Project, Nepal
Sapkota, Nitish (Master thesis, 2020)The study aims to analyse the effects of sediment bypass tunnel inlet location on intake hydraulics and suspended sediment removal for a reservoir of Upper Arun Hydroelectric Project (UAHEP) using numerical modelling ... -
Numerical simulation of sediment flushing in reservoirs
Ermilov, Alexander Anatol (Master thesis, 2018)As we saw, sediment can be a major factor in decreasing the lifespan, efficiency and profit of a hydropower plant. Countries and companies have to have countermeasures against the sedimentation, where high yields are ... -
Performance of a one-dimensional hydraulic model for the calculation of stranding areas in hydropeaking rivers
Casas-Mulet, Roser; Alfredsen, Knut; Boissy, Thibault; Sundt, Håkon; Rüther, Nils (Journal article; Peer reviewed, 2014)Fish stranding is a critical issue in rivers with peaking operations. The ability to accurately predict potential stranding areas can become a decisive factor to assess environmental impacts and to plan mitigation measures. ... -
A Reformed Empirical Equation for the Discharge Coefficient of Free-Flowing Type-A Piano Key Weirs
Kadia, Subhojit; Pummer, Elena Marianne; Kumar, Binit; Rüther, Nils; Ahmad, Zulfequar (Peer reviewed; Journal article, 2023)The existing equations for the discharge coefficient of Piano key weirs (PKWs) use a limited range of experimental data, which means that they are inappropriate for wide parametric ranges that might lead to significant ... -
Rehabilitering av fyllingsdammer: Lovverk og gjennomføring
Bogfjellmo, Ellen (Master thesis, 2014)Magasinering av vann ved hjelp av dammer er en viktig del av norsk vannkraftproduksjon. Fyllingsdammer er en damtype som i hovedsak består av oppfylte og komprimerte masser som jord, grus eller sprengstein. Det ble bygd ... -
Reynolds stress modeling of supercritical narrow channel flows using OpenFOAM: Secondary currents and turbulent flow characteristics
Kadia, Subhojit; Rüther, Nils; Ismail, Albayrak; Pummer, Elena (Peer reviewed; Journal article, 2022)In this study, the full Launder, Reece and Rodi pressure-strain model, and nonlinear boundary damping functions were incorporated in OpenFOAM® to simulate the turbulence-driven secondary currents in supercritical narrow ... -
Shelter for juvenile Atlantic salmon: availability and prediction in rivers with and without hydropower regulation.
Szabo-Meszaros, Marcell (Master thesis, 2015)It is assumed that river regulation in general and hydropeaking in particular, cause elevated degrees of fine sediments in river beds which affect negatively habitat quality for juvenile salmon. Finstad et al. (2007) ... -
Shelter for juvenile Atlantic salmon: availability and prediction in rivers with and without hydropower regulation.
Szabo-Meszaros, Marcell (Master thesis, 2015)It is assumed that river regulation in general and hydropeaking in particular, cause elevated degrees of fine sediments in river beds which affect negatively habitat quality for juvenile salmon. Finstad et al. (2007) ... -
Simulating pressurized reservoir flushing in scale models using lightweight sediments
Karmacharya, Sanat Kumar (Doctoral theses at NTNU;2021:13, Doctoral thesis, 2021)The dissertation presents the findings from laboratory experiments conducted to study the pressurised flushing phenomena using lightweight materials as model sediment. The study resulted in four research papers, which are ... -
Structure from Motion applied to movable bed scale models
Shrestha, Ujjwal (Master thesis, 2019)Many spatial data collection methods are available for a physical hydraulic model study considering mobile bed sediment. Some of them are highly sophisticated and advanced, which provide high-quality results in a shorter ... -
The effect of bed porosity on turbulent flow in gravel-bed rivers
Navaratnam, Christy Ushanth (Doctoral theses at NTNU;2018:352, Doctoral thesis, 2018)This thesis presents the main findings from laboratory experiments that were specially designed to study the effect of gravel bed porosity on the surface flow characteristics. The thesis also contains five primary and two ... -
Three-Dimensional Numerical Modelling of Water Flow over a Rough Channel Bed
Willmann, Eivind Sønnesyn (Master thesis, 2017)A three-dimensional numerical model is used to simulate the water flow field over a rough channel bed, utilizing the open source computational fluid dynamics toolbox OpenFOAM. The geometry of the numerical model is a ...