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Controlled Reservoir Drawdown—Challenges for Sediment Management and Integrative Monitoring: An Austrian Case Study—Part B: Local Scale
Article

Controlled Reservoir Drawdown—Challenges for Sediment Management and Integrative Monitoring: An Austrian Case Study—Part A: Reach Scale

1
Christian Doppler Laboratory for Sediment Research and Management, Institute of Hydraulic Engineering and River Research, Department of Water-Atmosphere-Environment, University of Natural Resources and Life Sciences, Vienna (BOKU), Muthgasse 107, 1190 Vienna, Austria
2
H&S Limnologie GmbH, Valiergasse 60, 6020 Innsbruck, Austria
3
TIWAG-Tiroler Wasserkraft AG, Eduard-Wallnöfer-Platz 2, 6020 Innsbruck, Austria
4
Institute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences, Vienna (BOKU), Gregor-Mendel-Straße 33, 1180 Vienna, Austria
*
Author to whom correspondence should be addressed.
Water 2020, 12(4), 1058; https://doi.org/10.3390/w12041058
Received: 10 January 2020 / Revised: 29 March 2020 / Accepted: 1 April 2020 / Published: 8 April 2020
(This article belongs to the Special Issue Sediment Management: Hydropower Improvement and Habitat Evaluation)
For Europe, a reduction of 80% of the potential storage volume due to reservoir sedimentation is predicted by 2080. Sedimentation processes trigger the decrease of the storage volume and a related restriction in hydropower production. Further, the artificial downstream flushing of deposited fines has manifold effects on the aquatic ecology, including changes in morphology and sediment quality, as well as increased turbidity and subsequent stress for aquatic species. However, it is common to lower the water surface of reservoirs for technical inspections, which is not comparable to reservoir flushing operations. The presented case study deals with such a controlled drawdown beyond the operational level of the Gepatsch reservoir (Tyrol, Austria). Based on the awareness of possible ecological consequences, an advanced set of measures and an integrative monitoring design, consisting of a detailed event-based quantification of suspended sediments, changes in the morphology, especially with respect to fine sediments, and analyses of the biological quality element fish on the reach scale along the Inn River have been developed. View Full-Text
Keywords: reservoir management; hydropower; flushing vs. controlled drawdown; fine sediment dynamics; aquatic biota reservoir management; hydropower; flushing vs. controlled drawdown; fine sediment dynamics; aquatic biota
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MDPI and ACS Style

Hauer, C.; Haimann, M.; Holzapfel, P.; Flödl, P.; Wagner, B.; Hubmann, M.; Hofer, B.; Habersack, H.; Schletterer, M. Controlled Reservoir Drawdown—Challenges for Sediment Management and Integrative Monitoring: An Austrian Case Study—Part A: Reach Scale. Water 2020, 12, 1058. https://doi.org/10.3390/w12041058

AMA Style

Hauer C, Haimann M, Holzapfel P, Flödl P, Wagner B, Hubmann M, Hofer B, Habersack H, Schletterer M. Controlled Reservoir Drawdown—Challenges for Sediment Management and Integrative Monitoring: An Austrian Case Study—Part A: Reach Scale. Water. 2020; 12(4):1058. https://doi.org/10.3390/w12041058

Chicago/Turabian Style

Hauer, Christoph, Marlene Haimann, Patrick Holzapfel, Peter Flödl, Beatrice Wagner, Michael Hubmann, Bernhard Hofer, Helmut Habersack, and Martin Schletterer. 2020. "Controlled Reservoir Drawdown—Challenges for Sediment Management and Integrative Monitoring: An Austrian Case Study—Part A: Reach Scale" Water 12, no. 4: 1058. https://doi.org/10.3390/w12041058

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