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Article

HEM Impoundment—A Numerical Prediction Tool for the Water Framework Directive Assessment of Impounded River Reaches

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, Muthgasse 107, 1190 Vienna, Austria
2
Institute of Hydraulic Engineering and River Research, Department of Water-Atmosphere-Environment, University of Natural Resources and Life Sciences Vienna, Muthgasse 107, 1190 Vienna, Austria
*
Author to whom correspondence should be addressed.
Water 2020, 12(4), 1045; https://doi.org/10.3390/w12041045
Received: 16 March 2020 / Revised: 3 April 2020 / Accepted: 5 April 2020 / Published: 7 April 2020
(This article belongs to the Special Issue Sediment Management: Hydropower Improvement and Habitat Evaluation)
A novel prediction tool is presented as a component of the Habitat Evaluation Model (HEM), which allows the assessment of the ecological status of impounded water bodies based on environmental factors that were shown in literature to correlate with the abundance of benthic macro-invertebrates. Main model parameters are the observed grain sizes and depth-averaged flow velocities obtained from a hydrodynamic simulation. The tool was tested in three Austrian river reaches. It was found that the river lengths predicted to be ecologically affected by the impoundments were substantially shorter for mean flow conditions than previously assessed when employing a physical mapping approach. The differences disappeared for low discharge conditions. The numerical prediction tool allows us to perform a status assessment for discharge conditions, which are potentially more representative of the annual discharge spectrum than those within the in-situ observable range. This property, thus, bears the potential to facilitate the recommendation of sediment management strategies in impounded river reaches in the future. View Full-Text
Keywords: impoundment; hydrodynamics; sediment; benthic macro-invertebrates; numerical simulation impoundment; hydrodynamics; sediment; benthic macro-invertebrates; numerical simulation
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MDPI and ACS Style

Tritthart, M.; Flödl, P.; Habersack, H.; Hauer, C. HEM Impoundment—A Numerical Prediction Tool for the Water Framework Directive Assessment of Impounded River Reaches. Water 2020, 12, 1045. https://doi.org/10.3390/w12041045

AMA Style

Tritthart M, Flödl P, Habersack H, Hauer C. HEM Impoundment—A Numerical Prediction Tool for the Water Framework Directive Assessment of Impounded River Reaches. Water. 2020; 12(4):1045. https://doi.org/10.3390/w12041045

Chicago/Turabian Style

Tritthart, Michael, Peter Flödl, Helmut Habersack, and Christoph Hauer. 2020. "HEM Impoundment—A Numerical Prediction Tool for the Water Framework Directive Assessment of Impounded River Reaches" Water 12, no. 4: 1045. https://doi.org/10.3390/w12041045

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