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

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-ev...

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Bibliographic Details
Published in:Water (Basel) 2020-04, Vol.12 (4), p.1055
Main Authors: Hauer, Christoph, Holzapfel, Patrick, Flödl, Peter, Wagner, Beatrice, Graf, Wolfram, Leitner, Patrick, Haimann, Marlene, Holzer, Georg, Haun, Stefan, Habersack, Helmut, Schletterer, Martin
Format: Article
Language:English
Subjects:
Aquatic ecology
Aquatic environment
Behavior
Case studies
Core sampling
Drawdown
Environmental monitoring
Fish eggs
Fishes
Habitats
Hydroelectric power
Incubation
Investigations
Monitoring
Morphology
Reservoir management
Reservoirs
Sediments
Sediments (Geology)
Soil management
Turbidity
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Summary: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.
ISSN:2073-4441
2073-4441
DOI:10.3390/w12041055