Browsing NTNU Open by Author "Ruther, Nils"
Now showing items 1-20 of 21
-
2D Numerical Modelling of Sediment Diversion in a River Bend
Shrestha, Rajeev (Master thesis, 2022)Sedimentation has been one of the existing challenges in the sustainability of hydraulic structures. Proper modelling of sediment transport is, therefore, an important task for a designer or a project planner. Research has ... -
3D CFD modeling of local scouring, bed armoring and sediment deposition
Török, Gergerly; Baranya, Sandor; Ruther, Nils (Journal article; Peer reviewed, 2017)3D numerical models are increasingly used to simulate flow, sediment transport and morphological changes of rivers. For the simulation of bedload transport, the numerical flow model is generally coupled with an empirical ... -
3D CFD Simulation of flow structures and bed load movement at Binga HPP
Nepal, Dipesh (Master thesis, 2019)The present study aims to perform three-dimensional numerical modeling of a water reservoir called Binga situated in Philippines. The hydraulic and sediment simulation should be performed. A working hypothesis on how to ... -
3D numerical modeling of a river confluence – movable bed implications
Mirzaahmadi, Ayda (Master thesis, 2022)River confluences are the morphodynamically challenging sections of river networks. Regardless of their occurrence which can be manually or naturally, they are constantly changing and are dominated by a complex flow pattern. ... -
3D Numerical Modelling of Sediment Fluxes at Paso Ancho Hydropower Project
Bijukchhe, Pratik (Master thesis, 2019)The purpose of this thesis was to setup a three-dimensional numerical model on SSIIM 2 for the peaking pond of the Paso Ancho Hydropower Project. Not limited to numerical model, failure reasons for the desander is also ... -
Banje Reservoir Sedimentation - Hydropower reservoir long-term simulation under different scenarios
Pereyra Yraola, Ignacio (Master thesis, 2023)En av hovedutfordringene ved utforming av vannkraftverk over hele verden er sedimentasjon i reservoarene. Dette kommer av kompleksiteten i drivmekanismene og usikkerheten rundt det klimatiske forholdet systemet utsettes ... -
Bank Retreat and Streambank Morphology of a Meandering River during Summer and Single Flood Events in Northern Norway
Foerst, Markus; Ruther, Nils (Journal article; Peer reviewed, 2018)In recent years, advanced methods for measuring riverbank migration have been used to understand the process of river planform evolution. However, the role of the so-called outer secondary cell in the hydraulic pattern in ... -
Bedload Monitoring by means of Hydro - Acoustic Techniques
Conevski, Slaven (Doctoral theses at NTNU;2020:47, Doctoral thesis, 2020)The bedload distribution through the alluvial streams contributes in shaping of the river morphology. Therefore, bedload transport data are fundamental requirement for proper management of engineering practices in complex ... -
Bedload Velocity and Backscattering Strength from Mobile Sediment Bed: A Laboratory Investigation Comparing Bistatic Versus Monostatic Acoustic Configuration
Conevski, Slaven; Alexio, Rui; Guerrero, Massimo; Ruther, Nils (Peer reviewed; Journal article, 2020)Despite the many advantages of using active ultrasound sonars, recent studies have shown that the specific acoustic geometry, signal-processing configuration, and complex surface-volume scattering process at the riverbed ... -
CFD modeling as part of a hybrid modeling case study for a gauging station with challenging hydraulics
Pedersen, Øyvind; Ruther, Nils (Journal article; Peer reviewed, 2019)Estimates of peak flood discharges are most often based on stage measurements, and the discharge is determined indirectly from the extrapolation of a rating-curve. It is possible to improve the extrapolation of the ... -
Development of a method for suspended sediment transport monitoring by means of ADCP measurements
Aleixio, Rui; Guerrero, Massimo; Ruther, Nils; Stokseth, Siri (Journal article; Peer reviewed, 2018)Monitoring stations in rivers and water courses are an important mean to obtain critical data about the different variables that play a role in the hydrodynamics and ecological processes. Measuring suspended sediment ... -
Dynamic lift on an artificial static armor layer during highly unsteady open channel flow
Spiller, Stephan Mark; Ruther, Nils; Friedrich, Heide (Journal article; Peer reviewed, 2015)The dynamic lift acting on a 100 mm × 100 mm section of a static armor layer during unsteady flow is directly measured in a series of physical experiments. The static armor layer is represented by an artificial streambed ... -
Evaluating the structure from motion technique for measurement of bed morphology in physical model studies
Karmacharya, Sanat Kumar; Ruther, Nils; Shrestha, Usha; Bishwakarma, Meg Bahadur (Peer reviewed; Journal article, 2021)The selection of instrumentation for data acquisition in physical model studies depends on type and resolution of data to be recorded, time frame of the model study, available instrumentation alternatives, availability of ... -
Evaluation of an acoustic Doppler technique for bed-load transport measurements in sand-bed Rivers
Conevski, Slaven; Winterscheid, Axel; Ruther, Nils; Guerrero, Massimo; Rennie, Colin (Journal article; Peer reviewed, 2018)The bottom tracking (BT) feature of the acoustic Doppler current profilers (ADCP) have emerged as a promising technique in evaluating the bed load. Strong statistical correlations are reported between the ADCP BT velocity ... -
Hydraulic physical model production with Computer Numerically Controlled (CNC) manufacturing techniques
Henry, Pierre-Yves T; Aberle, Jochen; Navaratnam, Christy Ushanth; Ruther, Nils (Journal article; Peer reviewed, 2018)Physical models are a well-accepted tool in hydraulic engineering, allowing for the detailed characterisation of flow processes and the validation of structure designs with complex boundary conditions. The methods used to ... -
Hydraulic scale modelling of the rating curve for a gauging station with challenging geometry
Pedersen, Øyvind; Aberle, Jochen; Ruther, Nils (Peer reviewed; Journal article, 2019)Direct discharge measurements during flood events can be challenging from a technical as well as from a safety point of view. Therefore, flood discharges are often estimated by extrapolating a rating curve. Extrapolations ... -
Numerical study of discharge adjustment effects on reservoir morphodynamics and flushing efficiency: An outlook for the unazuki reservoir, Japan
Esmaeili, Taymaz; Sumi, Tetsuya; Kantoush, Sameh A.; Kubota, Yoji; Haun, Stefan; Ruther, Nils (Journal article; Peer reviewed, 2021) -
The Story of a Steep River: Causes and Effects of the Flash Flood on 24 July 2017 in Western Norway
Moraru, Adina; Pavlícek, Michal; Bruland, Oddbjørn; Ruther, Nils (Peer reviewed; Journal article, 2021)Flash floods can cause great geomorphological changes in ephemeral fluvial systems and result in particularly severe damages for the unprepared population exposed to it. The flash flood in the Storelva river in Utvik ... -
The acoustic properties of suspended sediment in large rivers: Consequences on ADCP methods applicability
Guerrero, Massimo; Ruther, Nils; Szupiany, Ricardo; Haun, Stefan; Baranya, Sandor; Latosinski, Francisco (Journal article; Peer reviewed, 2016)The use of echo-levels from Acoustic Doppler Current Profiler (ADCP) recordings has become more and more common for estimating suspended bed-material and wash loads in rivers over the last decade. Empirical, semi-empirical ... -
Three-Dimensional Numerical Study of Free-Flow Sediment Flushing to Increase the Flushing Efficiency: A Case-Study Reservoir in Japan
Esmaeili, Taymaz; Sumi, Tetsuya; Kantoush, Sameh A; Kubota, Y; Haun, Stefan; Ruther, Nils (Journal article; Peer reviewed, 2017)The catchment of the Dashidaira reservoir located on the Kurobe River has high sediment yield. Because of the sufficient available amount of water in the catchment during flood events, the free-flow sediment flushing ...