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Article

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

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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
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Institute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences, Vienna (BOKU), Gregor-Mendel-Straße 33, 1180 Vienna, Austria
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Ingenieurbüro für Landschaftsplanung und Landschaftspflege DI Georg Holzer, Schönbrunner Allee 30/5, 1120 Vienna, Austria
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Institute of Modelling Hydraulic and Environmental Systems, University of Stuttgart, 70569 Stuttgart, Germany
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TIWAG—Tiroler Wasserkraft AG, Eduard-Wallnöfer-Platz 2, 6020 Innsbruck, Austria
*
Author to whom correspondence should be addressed.
Water 2020, 12(4), 1055; https://doi.org/10.3390/w12041055
Received: 10 January 2020 / Revised: 9 March 2020 / Accepted: 13 March 2020 / Published: 8 April 2020
(This article belongs to the Special Issue Sediment Management: Hydropower Improvement and Habitat Evaluation)
The present case study deals with a controlled drawdown beyond the operational level of the Gepatsch reservoir (Austria). Based on the awareness of potential ecological consequences, an advanced set of measures was conducted and an integrative monitoring design was implemented. This pre- and post-event monitoring included measurements regarding the cross sectional variability and habitat-related turbidity, freeze-core sampling to obtain knowledge on fine sediment infiltration and an evaluation of the macroinvertebrate communities as well as fish egg development (salmonid incubation). The results of the sedimentological as well as biological investigations show a negligible impact on the downstream located aquatic system due to the controlled drawdown of the Gepatsch reservoir. In addition, recommendations based on the findings from this study regarding possible methods for local scale monitoring can be given. 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.; Holzapfel, P.; Flödl, P.; Wagner, B.; Graf, W.; Leitner, P.; Haimann, M.; Holzer, G.; Haun, S.; Habersack, H.; Schletterer, M. Controlled Reservoir Drawdown—Challenges for Sediment Management and Integrative Monitoring: An Austrian Case Study—Part B: Local Scale. Water 2020, 12, 1055. https://doi.org/10.3390/w12041055

AMA Style

Hauer C, Holzapfel P, Flödl P, Wagner B, Graf W, Leitner P, Haimann M, Holzer G, Haun S, Habersack H, Schletterer M. Controlled Reservoir Drawdown—Challenges for Sediment Management and Integrative Monitoring: An Austrian Case Study—Part B: Local Scale. Water. 2020; 12(4):1055. https://doi.org/10.3390/w12041055

Chicago/Turabian Style

Hauer, Christoph, Patrick Holzapfel, Peter Flödl, Beatrice Wagner, Wolfram Graf, Patrick Leitner, Marlene Haimann, Georg Holzer, Stefan Haun, Helmut Habersack, and Martin Schletterer. 2020. "Controlled Reservoir Drawdown—Challenges for Sediment Management and Integrative Monitoring: An Austrian Case Study—Part B: Local Scale" Water 12, no. 4: 1055. https://doi.org/10.3390/w12041055

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