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Water Resources Management

, Volume 26, Issue 5, pp 1231–1252 | Cite as

Variations in Discharge Volumes for Hydropower Generation in Switzerland

  • Pascal HänggiEmail author
  • Rolf Weingartner
Article

Abstract

This study analyses the way climatic variations over the last century impacted the volumes of water available for hydropower production in Switzerland. The analysis relied on virtual intakes located all over Switzerland, which were assumed to be fed by water from mesoscale catchments. Intake capacities were designed using flow duration curves. The results show that the overall warming and increased winter precipitation observed in recent decades have led to more balanced discharge behaviours in rivers and more favourable conditions for electricity production than most periods in the past. In lower-altitude regions of Switzerland, the annual volume of water available for electricity production has not changed significantly; however, significantly more water is available in winters, while less is available during summers. In higher-altitude regions like the Swiss Alps, especially in glaciated catchment areas, significantly more water is available in both seasons; in other words, the annual volume of water available for hydropower production is significantly higher in these areas when compared to earlier periods. Comparison of these results with the actual amount of hydroelectricity produced over the same period reveals that hydrological variations cannot fully explain the variations in power production observed. Plant-specific analyses are needed of the impact of climatic changes on water management.

Keywords

Alps Climate change Design discharge Hydroelectric power Flow duration curve Switzerland 

Notes

Acknowledgements

This study is part of the Swiss Mountain Water Network initiated project “Climate change and hydropower generation in Switzerland”. The project is funded by Swisselectric Research and the Swiss Federal Office of Energy (SFOE). Runoff data were provided by the Swiss Federal Office for the Environment (FOEN), Grande-Dixence S.A., and the cantons of Appenzell Ausserrhoden, Fribourg, St. Gallen, and Zurich.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  1. 1.Institute of Geography and Oeschger Centre for Climate Change ResearchUniversity of BernBernSwitzerland

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