Blar i NTNU Open på forfatter "Alfredsen, Knut"
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Environmental Flows in Nepal - An Evaluation of Current Practices and an Analysis of the Upper Trishuli-I Hydroelectric Project.
Rial, Narayan Hari; Alfredsen, Knut (Journal article; Peer reviewed, 2015)Environmental assessments and environmental flows are important components in modern hydropower development. Various methods employing a combination of hydrology, hydraulics, environmental assessment and ecology have been ... -
Environmental flows in Nepal - an evaluation of current practices and analysis of the Upper Trishuli -I Hydroelectric Project
Rijal, Narayanhari (Master thesis, 2014)ABSTRACTEnvironmental assessments and environmental flows are important components of modern hydropower development. In the developed countries, comprehensive and detailed assessments including research works are being ... -
Environmental Impacts of Pumped Storage Hydro Power Plants
Patocka, Filip (Master thesis, 2014)Massive development of new renewable energy sources is taking place all over the world in 21st century and Europe is not an exception. Wind turbine parks are being planned and built on shore, in coastal zones and in the ... -
Estimating radar precipitation in cold climates: the role of air temperature within a non-parametric framework
Sivasubramaniam, Kuganesan; Sharma, Ashish; Alfredsen, Knut (Journal article; Peer reviewed, 2018)Remote sensing applied to river monitoring adds complementary information useful for understanding the system behaviour. In this paper, we present a method for visual stage gauging and water surface width measurement using ... -
Estimating Radar Precipitation in Cold Climates: The role of Air Temperature within a Nonparametric Framework
Sivasubramaniam, Kuganesan; Alfredsen, Knut; Sharma, Ashish (Journal article; Peer reviewed, 2018)The use of ground-based precipitation measurements in radar precipitation estimation is well known in radar hydrology. However, the approach of using gauged precipitation and near-surface air temperature observations to ... -
Estimating runoff from ungauged catchments using regional modelling
Lobintceva, Ekaterina (Master thesis, 2014)Establishing runoff series from ungauged catchment is a central challenge in hydrology. In Norway this is particularly evident in the design of small hydropower. The location of the power plant often is in small catchments ... -
Estimation of Z-R relationship and comparative analysis of precipitation data from colocated rain-gauge, vertical radar and disdrometer
Cyr, Isabel (Master thesis, 2014)The estimation of precipitation rates and accumulations constitutes an essential input data for distributed hydrological models and for many hydrometeorological applications, such as short term hydro-scheduling, forecasting ... -
Estimering av avrenning i umålte felt ved bruk av kartkorrelasjonsmetoden med kovariabler
Gjestemoen, Erlend K (Master thesis, 2014)SammendragEstimering av umålte felt tar ofte i bruk referansefelt for å overføre egenskaper ved vannføringsserien til det umålte feltet. Derfor er det en av de viktigste utfordringene innen estimering av umålte felt, å ... -
Evaluating approaches to estimate runoff from small ungauged catchments in Norway
(Master thesis, 2019)Sufficient and Accurate runoff time series are vital information which are required in many watershed development projects. Unfortunately, most of the catchments in the world are ungauged, and this issue is more pronounced ... -
Evaluating different machine learning methods to simulate runoff from extensive green roofs
Hassan Abdalla, Elhadi Mohsen; Pons, Vincent; Stovin, Virginia; De-Ville, Simon; Fassman-Beck, Elisabeth; Alfredsen, Knut; Muthanna, Tone Merete (Peer reviewed; Journal article, 2021)Green roofs are increasingly popular measures to permanently reduce or delay storm-water runoff. The main objective of the study was to examine the potential of using machine learning (ML) to simulate runoff from green ... -
Evaluation and upgrade of the Telemark flood model
Addo, Louis (Master thesis, 2016)Flood forecasting models are important tools that could be used to find the optimum way to operate hydropower reservoirs in order to reduce flood disasters of especially human settles close to these reservoirs. The flood ... -
Evaluation and upgrade of the Telemark flood model
Addo, Louis (Master thesis, 2016)Flood forecasting models are important tools that could be used to find the optimum way to operate hydropower reservoirs in order to reduce flood disasters of especially human settles close to these reservoirs. The flood ... -
Evaluation of bypass valves at small hydro power plants
Mendikute Bernardo, Jokin (Master thesis, 2017)Hydropeaking has adverse effects on river ecosystems which are likely to increase as hydropeaking increases. Bypass valves are extensively used in Norway to mitigate the sudden changes in water discharge, and this thesis ... -
Evaluation of different parameterizations of the spatial heterogeneity of subsurface storage capacity for hourly runoff simulation in boreal mountainous watershed
Hailegeorgis, Teklu Tesfaye; Alfredsen, Knut; Abdella, Yisak Sultan; Kolberg, Sjur (Journal article; Peer reviewed, 2015)Identification of proper parameterizations of spatial heterogeneity is required for precipitation-runoff models. However, relevant studies with a specific aim at hourly runoff simulation in boreal mountainous catchments ... -
Evaluation of operational changes in Norwegian hydropower
Ruiz, Laura (Master thesis, 2019)Around 98% of the energy in Norway comes from renewable sources and from this, 96% corresponds to hydropower, which has made it a central point in Norwegian water management. The growing interest in implementing an appropriate ... -
Evaluation of Regionalization Methods for Hourly Continuous Streamflow Simulation Using Distributed Models in Boreal Catchments
Hailegeorgis, Teklu Tesfaye; Abdella, Yisak Sultan; Alfredsen, Knut; Kolberg, Sjur (Journal article; Peer reviewed, 2015)Regionalization for prediction in ungauged basins at hourly resolution is important for water resources management (e.g. floods and hydropeaking). In this paper, calibration of 26 catchments (39-3090 km2 ) in mid-Norway ... -
Evaluation of snow simulations in SHyFT
Katirachi, Amir Nasser (Master thesis, 2018)The main objective of this paper is to evaluate the SHyFT snow routine performance against observed snow data obtained from snow measurements in the field. SHyFT (Statkraft Hydrological Forecasting Toolbox) is an open ... -
Evaluation of snow simulations in SHyFT
Ullibarri Lombraña, Joseba (Master thesis, 2017)Snow is a very important component in the hydrological cycle in Norway and crucial for determining reservoir operation during the spring flood to ensure full reservoir and as little flood spill as possible. The Statkraft ... -
Evaluation of storage–discharge relationships and recession analysis-based distributed hourly runoff simulation in large-scale, mountainous and snow- influenced catchment
Hailegeorgis, Teklu Tesfaye; Alfredsen, Knut; Abdella, Yisak Sultan; Kolberg, Sjur (Journal article; Peer reviewed, 2016)Evaluation of a recession-based “top-down” model for distributed hourly runoff simulation in macroscale mountainous catchments is rare in the literature. We evaluated such a model for a 3090 km2 boreal catchment and its ... -
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 ...