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Open AccessFeature PaperEditor’s ChoiceArticle

Experimental Study at the Reservoir Head of Run-of-River Hydropower Plants in Gravel Bed Rivers. Part II: Effects of Reservoir Flushing on Delta Degradation

CD-Laboratory for Sediment Research and mManagement, Institute for Hydraulic Engineering and River Research, Department for Water—Atmosphere—Environment, BOKU—University of Natural Resources and Life Sciences Vienna, 1190 Vienna, Austria
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Water 2020, 12(11), 3038; https://doi.org/10.3390/w12113038
Received: 29 September 2020 / Revised: 20 October 2020 / Accepted: 24 October 2020 / Published: 29 October 2020
(This article belongs to the Special Issue Sediment Management: Hydropower Improvement and Habitat Evaluation)
Run-of-river hydropower plants (RoR HPPs) are capable of interrupting the sediment connectivity of many alpine rivers. Still, there is a lack of systematical investigations of possible sediment management strategies for small and medium sized RoR HPPs. This study deals with the headwater section of an impoundment and the approach of sediment remobilization during drawdown operations. Therefore, a typical medium sized gravel bed river having a width of 20 m, a mean bed slope of 0.005, a mean flow rate of 22 m3/s, and a 1-year flood flow of 104 m3/s is recreated by a 1:20 scaled physical model. Heterogenous sediment mixtures were used under mobile-bed conditions, representing a range of 14–120 mm in nature. During the experiments, the flow rate was set to be 70% of the 1-year flood (HQ1) regarding on the ability to mobilize all sediment fractions. The possibility to remobilize delta depositions by (partial) drawdown flushing within a reasonable period (≈9 h in 1:1 scale) was shown by the results. The erosion of existing headwater delta deposition was found to be retrogressive and twice as fast as the preceding delta formation process. A spatiotemporal erosion scheme points out these findings. This supports the strategy of a reservoir drawdown at flood events of high reoccurrence rate. View Full-Text
Keywords: gravel bed rivers; run-of-river hydropower plants; sediment continuity; flushing events; delta formation; sediment management strategies; retrogressive erosion gravel bed rivers; run-of-river hydropower plants; sediment continuity; flushing events; delta formation; sediment management strategies; retrogressive erosion
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MDPI and ACS Style

Reiterer, K.; Gold, T.; Habersack, H.; Hauer, C.; Sindelar, C. Experimental Study at the Reservoir Head of Run-of-River Hydropower Plants in Gravel Bed Rivers. Part II: Effects of Reservoir Flushing on Delta Degradation. Water 2020, 12, 3038. https://doi.org/10.3390/w12113038

AMA Style

Reiterer K, Gold T, Habersack H, Hauer C, Sindelar C. Experimental Study at the Reservoir Head of Run-of-River Hydropower Plants in Gravel Bed Rivers. Part II: Effects of Reservoir Flushing on Delta Degradation. Water. 2020; 12(11):3038. https://doi.org/10.3390/w12113038

Chicago/Turabian Style

Reiterer, Kevin; Gold, Thomas; Habersack, Helmut; Hauer, Christoph; Sindelar, Christine. 2020. "Experimental Study at the Reservoir Head of Run-of-River Hydropower Plants in Gravel Bed Rivers. Part II: Effects of Reservoir Flushing on Delta Degradation" Water 12, no. 11: 3038. https://doi.org/10.3390/w12113038

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