Combined effects of pumped-storage operation and climate change on thermal structure and water quality

Ulrike Gabriele Kobler (), Alfred Wüest and Martin Schmid
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Ulrike Gabriele Kobler: Eawag, Swiss Federal Institute of Aquatic Science and Technology
Alfred Wüest: Eawag, Swiss Federal Institute of Aquatic Science and Technology
Martin Schmid: Eawag, Swiss Federal Institute of Aquatic Science and Technology

Climatic Change, 2019, vol. 152, issue 3, No 7, 413-429

Abstract: Abstract The assessment of ecological impacts of pumped-storage (PS) hydropower plants on the two connected water bodies is usually based on present climatic conditions. However, significant changes in climate must be expected during their long concession periods. We, therefore, investigate the combined effects of climate change and PS operations on water temperature and quality, as well as extent and duration of stratification and ice cover, using a site in Switzerland. For this purpose, a coupled two-dimensional hydrodynamic and water quality model for the two connected water bodies is run with 150 years long synthetic stochastic meteorological forcing for both current and future climate conditions under two PS and two reference scenarios. The results show relevant synergistic and antagonistic effects of PS operations and climate change. For example, hypolimnion temperatures in September are projected to increase by

Date: 2019
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DOI: 10.1007/s10584-018-2340-x

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