Effects of weir height and reservoir widening on sediment continuity at run-of-river hydropower plants in gravel bed rivers

Geomorphology ◽  
2017 ◽  
Vol 291 ◽  
pp. 106-115 ◽  
Author(s):  
Christine Sindelar ◽  
Johannes Schobesberger ◽  
Helmut Habersack
Keyword(s):  
Gravel Bed ◽  
Hydropower Plants ◽  
Gravel Bed Rivers ◽  
Weir Height ◽  
Run Of River

DELTA FORMATIONIN RESERVOIRS OF RUN-OF-RIVER HYDROPOWER PLANTS IN GRAVEL BED RIVERS-EXPERIMENTAL STUDIES WITH NONUNIFORM SEDIMENTS

2019 ◽  
Author(s):  
CHRISTINE SINDELAR ◽  
THOMAS GOLD ◽  
KEVIN REITERER ◽  
JOHANNES SCHOBESBERGER ◽  
PETR LICHTNEGER ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Gravel Bed ◽  
Hydropower Plants ◽  
Gravel Bed Rivers ◽  
Run Of River

scholarly journals Experimental Study at the Reservoir Head of Run-of-River Hydropower Plants in Gravel Bed Rivers. Part I: Delta Formation at Operation Level

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 2035 ◽  
Author(s):  
Christine Sindelar ◽  
Thomas Gold ◽  
Kevin Reiterer ◽  
Christoph Hauer ◽  
Helmut Habersack
Keyword(s):  
Physical Model ◽  
Flow Rate ◽  
Management Strategies ◽  
Water Levels ◽  
Hydropower Plant ◽  
Mean Flow ◽  
Gravel Bed ◽  
Delta Formation ◽  
Gravel Bed Rivers ◽  
Run Of River

This study concerns scaled physical model tests of the delta formation process at the head of a run-of-river hydropower plant (RoR). It forms part of a larger research project to provide a scientific base for RoR sediment management strategies in medium-sized gravel bed rivers. The physical model consisted of an idealized river having a width of 20 m, a mean slope of 0.005, a mean flow rate of 22 m3/s and a 1-year flood flow of 104 m3/s. The model scale was 1:20. For the experiments, five different grain sizes were used, covering a range of 14 to 120 mm at 1:1 scale. Experiments were carried out under mobile-bed conditions at flow rates which correspond to 50%–80% of a 1-year flood HQ1. Even at the head of the reservoir, which is least influenced by the backwater effect of the RoR, sediment transport practically ceases for sediment fractions >14 mm for a flow rate of 0.7 × HQ1. The whole sediment load coming from the undisturbed upstream section accumulates at the head of the reservoir. This delta formation is accompanied by a substantial rise in water levels. A spatio-temporal scheme of the delta formation was derived from the experiments. The study proved that the delta formation increases the flood risk at the head of the reservoir. Conversely, reservoir drawdowns at flood events of high probability may be a promising strategy to enhance sediment connectivity under the specified boundary conditions.

scholarly journals 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 ◽  
Vol 12 (11) ◽  
pp. 3038 ◽  
Author(s):  
Kevin Reiterer ◽  
Thomas Gold ◽  
Helmut Habersack ◽  
Christoph Hauer ◽  
Christine Sindelar
Keyword(s):  
Flow Rate ◽  
Management Strategies ◽  
Mean Flow ◽  
Gravel Bed ◽  
Hydropower Plants ◽  
Reservoir Drawdown ◽  
Delta Formation ◽  
Bed Slope ◽  
Alpine Rivers ◽  
Run Of River

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.

Comparing gravel-bed rivers in paired urban and rural catchments of southeastern Pennsylvania

Geology ◽  
2000 ◽  
Vol 28 (1) ◽  
pp. 79-82 ◽  
Author(s):  
J. E. Pizzuto ◽  
W. C. Hession ◽  
M. McBride
Keyword(s):  
Gravel Bed ◽  
Gravel Bed Rivers

UNRAVELLING THE ROLE OF VEGETATION IN THE AVULSION HISTORY OF GRAVEL-BED RIVERS

2018 ◽  
Author(s):  
Daniel Donahue ◽  
◽  
José Antonio Constantine ◽  
Gregory B. Pasternack
Keyword(s):  
Gravel Bed ◽  
History Of ◽  
Gravel Bed Rivers

Effects of run‐of‐river hydropower plants on fish communities in montane stream ecosystems in Serbia

2021 ◽  
Author(s):  
Predrag Simonović ◽  
Ratko Ristić ◽  
Vukašin Milčanović ◽  
Siniša Polovina ◽  
Ivan Malušević ◽  
...  
Keyword(s):  
Fish Communities ◽  
Stream Ecosystems ◽  
Hydropower Plants ◽  
Run Of River

Unobstructed and Obstructed Turbulent Flow in Gravel Bed Rivers

2005 ◽  
Vol 131 (8) ◽  
pp. 635-645 ◽  
Author(s):  
Hans M. Tritico ◽  
Rollin H. Hotchkiss
Keyword(s):  
Turbulent Flow ◽  
Gravel Bed ◽  
Gravel Bed Rivers

scholarly journals Critical specific stream power in gravel-bed rivers

Geomorphology ◽  
2005 ◽  
Vol 69 (1-4) ◽  
pp. 92-101 ◽  
Author(s):  
F. Petit ◽  
F. Gob ◽  
G. Houbrechts ◽  
A.A. Assani
Keyword(s):  
Stream Power ◽  
Gravel Bed ◽  
Gravel Bed Rivers
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