Cristin-resultat-ID: 1038323
Sist endret: 20. januar 2015, 14:03
NVI-rapporteringsår: 2013
Resultat
Vitenskapelig artikkel
2013

Simulation of the ice regime in a Norwegian regulated river

Bidragsytere:
  • Netra Prasad Timalsina
  • Julie Charmasson og
  • Knut Alfredsen

Tidsskrift

Cold Regions Science and Technology
ISSN 0165-232X
e-ISSN 1872-7441
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2013
Volum: 94
Sider: 61 - 73

Importkilder

Isi-ID: 000324444700007
Scopus-ID: 2-s2.0-84880989769

Beskrivelse Beskrivelse

Tittel

Simulation of the ice regime in a Norwegian regulated river

Sammendrag

River ice models are commonly used to study ice conditions in wide and low-gradient rivers in cold regions. However, examples of applications of these tools in shallow and fast-flowing rivers are rarely reported. In this study, the one-dimensional model MIKE-Ice was applied to study the ice regime of the regulated river Orkla in Norway. The river Orkla is characterized as a steep and shallow river with sequences of pools and riffles throughout its length. The model was calibrated and validated for the winters, 2010-2011 and 2011-2012 respectively. The study shows that the model is applicable in a steep river with transects of both subcritical and supercritical flow conditions, which is a different environment than most previously reported applications of river ice models. The simulated hydrodynamics and water temperature show good agreement with observations. The model was further tested on its ability to simulate the presence/absence of frazil ice and the development of an ice cover at observation points in the river using continuous monitoring with cameras. The ability to correctly simulate the ice cover extent of the entire model domain was also tested based on a number of field campaigns. The ice simulation results correspond well with observations both spatially and temporally. Further, two discharge scenarios were simulated: a) No hydropower regulation, and b) reduced hydropower operation: to assess the impact of the regulation and to explore the sensitivity of the model. The simulation results demonstrate how hydropower regulation has altered the thermal and ice regimes. The study concludes that Mike-Ice is a useful tool for predicting the river regime in the river Orkla, where dynamic ice formation is a dominant process. Copyright © 2013 Elsevier B.V. All rights reserved.

Bidragsytere

Netra Prasad Timalsina

  • Tilknyttet:
    Forfatter
    ved Institutt for bygg- og miljøteknikk ved Norges teknisk-naturvitenskapelige universitet

Julie Charmasson

  • Tilknyttet:
    Forfatter
    ved Energisystemer ved SINTEF Energi AS

Knut Tore Alfredsen

Bidragsyterens navn vises på dette resultatet som Knut Alfredsen
  • Tilknyttet:
    Forfatter
    ved Institutt for bygg- og miljøteknikk ved Norges teknisk-naturvitenskapelige universitet
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