Browsing SINTEF Open by Author "Alfredsen, Knut"
Now showing items 1-19 of 19
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Application of HYPE in Norway
Schönfelder, Lennart Hagen; Bakken, Tor Haakon; Alfredsen, Knut; Adera, Adebe Girmay (SINTEF Energi. Rapport;2017:00737, Research report, 2017) -
Are Reservoirs Water Consumers or Water Collectors? Reflections on the Water Footprint Concept Applied on Reservoirs
Bakken, Tor Haakon; Johnsen, Fredrikke; Killingtveit, Ånund; Alfredsen, Knut (Journal article; Peer reviewed, 2015)IPCC Special Report on Renewable Energy Sources (2011) revealed potentially very high water consumption rates from hydropower production compared to other renewable technologies, but suffered from few studies and methodological ... -
Can Energy Depletion of Wild Atlantic Salmon Kelts Negotiating Hydropower Facilities Lead to Reduced Survival?
Baktoft, Henrik; Gjelland, Karl Øystein; Szabo-Meszaros, Marcell; Silva, Ana T.; Riha, Milan; Økland, Finn; Alfredsen, Knut; Forseth, Torbjørn (Peer reviewed; Journal article, 2020)Repeat spawners constitute an important component of Atlantic salmon populations, but survival of post-spawning individuals (kelts) are often compromised by anthropogenic structures such as hydropower plants (HPPs). Potential ... -
Classification of hydropeaking impacts on Atlantic salmon populations in regulated rivers
Bakken, Tor Haakon; Harby, Atle; Forseth, Torbjørn; Ugedal, Ola; Sauterleute, Julian Friedrich; Halleraker, Jo Halvard; Alfredsen, Knut (Peer reviewed; Journal article, 2021)This article proposes and demonstrates a new classification system of fish population level effects of hydropeaking operations in rivers. The classification of impacts is developed along two axes; first, the hydromorphological ... -
Climate Change and Increased Irrigation Demands: What Is Left for Hydropower Generation? Results from Two Semi-Arid Basins
Bakken, Tor Haakon; Almestad, C; Rugelbak, JM; Escobar, M; Micko, S; Alfredsen, Knut (Journal article; Peer reviewed, 2016)In this study, we have modelled the effect of climate change and increased irrigation withdrawals on the available water for hydropower production in two semi-arid river basins, i.e., Kizilirmak (Turkey) and Devoll (Albania), ... -
Ecohydraulic Modelling to Support Fish Habitat Restoration Measures
Adeva Bustos, Ana; Alfredsen, Knut; Fjeldstad, Hans-Petter; Ottoson, Kenneth (Journal article; Peer reviewed, 2019) -
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) -
Hydrological performance of lined permeable pavements in Norway
Hassan Abdalla, Elhadi Mohsen; Selseth, Ingrid; Muthanna, Tone Merete; Helness, Herman; Alfredsen, Knut; Gaarden, Terje; Sivertsen, Edvard (Peer reviewed; Journal article, 2021)Lined permeable pavements (LPPs) are types of sustainable urban stormwater systems (SUDs) that are suitable for locations with low infiltration capacity or shallow groundwater levels. This study evaluated the hydrological ... -
Hydropower‐driven thermal changes, biological responses and mitigating measures in northern river systems
Heggenes, Jan; Stickler, Morten; Alfredsen, Knut; Brittain, John Edward; Adeva Bustos, Ana; Huusko, Ari (Peer reviewed; Journal article, 2021)Water temperatures control life histories and diversity of aquatic species. Hydropowerregulation, particularly in high head systems, alters natural water temperature regimes,which may have profound and long-term impacts ... -
Miljøkartlegging Nyset
Bustos, Ana Adeva; Alfredsen, Knut; Hansen, Bendik Kristoffer Torp; Awadallah, Mahmoud Omer Mahmoud (SINTEF Rapport;, Research report, 2021)Grunnet flom i Nysetelva på senhøsten 2018 gjorde representanter fra grunneierne, Østfold Energi (ØE) og NVE en befaring i 2019 for å vurdere konsekvensene med hensyn til endringer/gjengroing i elveløpet og terskler i nedre ... -
Modelling climate change effects on Atlantic salmon: Implications for mitigation in regulated rivers
Sundt-Hansen, Line Elisabeth Breivik; Hedger, Richard David; Ugedal, Ola; Diserud, Ola Håvard; Finstad, Anders Gravbrøt; Sauterleute, Julian Friedrich; Tøfte, Lena S; Alfredsen, Knut; Forseth, Torbjørn (Journal article; Peer reviewed, 2018)Climate change is expected to alter future temperature and discharge regimes of rivers. These regimes have a strong influence on the life history of most aquatic river species, and are key variables controlling the growth ... -
Outlining a hydromorphological classification system for lakes : data availability, modelling tools and comparable assessment approaches
Bakken, Tor Haakon; Schönfelder, Lennart Hagen; Charmasson, Julie; Alfredsen, Knut; Adera, Abebe Girmay (SINTEF Rapport;, Research report, 2018) -
Raske vannstandsendringer i elver - Virkninger på fisk, bunndyr og begroing
Harby, Atle; Alfredsen, Knut; Arnekleiv, Jo Vegar; Flodmark, Lars Erik Wilhelm; Halleraker, Jo Halvard; Johansen, Stein W; Saltveit, Svein Jakob (SINTEF Rapport;, Research report, 2004) -
Regionalized Linear Models for River Depth Retrieval Using 3-Band Multispectral Imagery and Green LIDAR Data
Sundt, Håkon; Alfredsen, Knut; Harby, Atle (Peer reviewed; Journal article, 2021)Bathymetry is of vital importance in river studies but obtaining full-scale riverbed maps often requires considerable resources. Remote sensing imagery can be used for efficient depth mapping in both space and time. ... -
The Water Footprint of Hydropower Production—State of the Art and Methodological Challenges
Bakken, Tor Haakon; Killingtveit, Ånund; Alfredsen, Knut (Journal article; Peer reviewed, 2017)This paper reviews published estimates of water consumption from hydropower production and the methodologies applied. Published values range from negative to more than 115 000 m3 MWh−1. Most gross water consumption rates ... -
Towards improving the hydrologic design of permeable pavements
Hassan Abdalla, Elhadi Mohsen; Muthanna, Tone Merete; Alfredsen, Knut; Sivertsen, Edvard (Peer reviewed; Journal article, 2022)The common approach to the hydrologic design of permeable pavements (PPs) uses synthetic rainfall events. This study assessed the validity of the design approach using synthetic rainfall events for undrained PP. Synthetic ... -
Validation of a Swimming Direction Model for the Downstream Migration of Atlantic Salmon Smolts
Szabo-Meszaros, Marcell; Silva, Ana T.; Bærum, Kim Magnus; Baktoft, Henrik; Alfredsen, Knut; Hedger, Richard David; Økland, Finn; Gjelland, Karl Øystein; Fjeldstad, Hans-Petter; Calles, Olle; Forseth, Torbjørn (Peer reviewed; Journal article, 2021)Fish swimming performance is strongly influenced by flow hydrodynamics, but little is known about the relation between fine-scale fish movements and hydrodynamics based on in-situ investigations. In the presented study, ... -
Water consumption from hydropower plants – review of published estimates and an assessment of the concept
Bakken, Tor Haakon; Killingtveit, Ånund; Engeland, Kolbjørn; Alfredsen, Knut; Harby, Atle (Journal article; Peer reviewed, 2013) -
Water consumption from hydropower plants – review of published estimates and an assessment of the concept
Bakken, Tor Haakon; Killingtveit, Ånund; Engeland, Kolbjørn; Alfredsen, Knut; Harby, Atle (Journal article, 2013)