Effets des barrages sur la continuité sédimentaire

Camenen, B.

doi:10.1051/lhb/2017052

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…Hydraulic fragmentation resulting from the dam series is the most significant modulator of bedload transport in the present-day Rhône River, and dams for hydropower are clearly linked to the main nodes of bedload discontinuity along the river corridor. As other studies have shown (EGR, 2000;Guertault et al, 2018;Camenen, 2017;Camenen et al, this issue), while some sediment is transferred across dams during flushing flows and at high discharges, it is sporadic and mostly limited to the fine fraction of the bedload. These observations are supported by the results of the GTM model presented here.…”

Section: Effects Of Hydraulic Discontinuity On Sediment Dynamics and Implications For Managementmentioning

confidence: 65%

“…Email address: vazqueztarrio@cerege.fr (D. Vázquez-Tarrío) flow (Williams and Wolman, 1984;Kondolf, 1997;Brandt, 2000;Vörösmarty et al, 2003;Graf, 2005Graf, , 2006; Magilligan and Nislow, 2005;Petts and Gurnell, 2005;Schmidt and Wilcock, 2008;Dade et al, 2011;Kondolf et al, 2014;Camenen, 2017). Yet, despite our understanding of these processes, the task of characterising the effects of separate human modifications and isolating causal factors driving channel change present a unique challenge on rivers with long and complex histories of human development carried out in multiple phases.…”

Section: Introductionmentioning

confidence: 99%

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Effects of continuous embankments and successive run-of-the-river dams on bedload transport capacities along the Rhône River, France

Vázquez‐Tarrío

Tal

Camenen

et al. 2019

Science of The Total Environment

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This study was aimed at untangling the relative impacts of successive phases of human modifications on changes in bedload transport along a 430 km-long river reach: the Rhône River from Motz dam to the sea. We used a 1D hydraulic model to solve for water lines across a range of discharges and all along the reach. Next, using grain sizes measured in the channel, we estimate flow competence and mean annual bedload transport capacities using the Recking (2013) bedload transport equation. In addition, we used the Generalized Threshold Model to estimate the relative fine and coarse fractions of the load. Bedload transport estimates were carried out under present-day hydraulic conditions and compared to estimates based on model runs simulating an unimpeded flow regime and using grain sizes measured in bars as a proxy for conditions prior to armouring.Our results show that present-day bedload transport along the Rhône is significantly fragmented by multiple closely spaced dams. Mean annual bedload capacity varies between 2500 and 16,300 m 3 /year over all the reaches, with an average of 4700 m 3 /year. Results of the GTM analysis suggest that this load is composed of 89% fines. We find bed sediment mobility to be very low in most reaches, and that potentially mobile sediments are finer than the median grain size in the riverbed even at high flows. Our results suggest that bedload capacities were 25-35 times higher prior to bed armouring and flow modifications; dams had an impact 2-3 times more important on transport capacities than channel embankments, and bed armouring was foremost a response to channel embankments. Based on an analysis of the ratio of sediment yields to transport capacities, we propose a conceptual scheme illustrating how bedload supply, channel morphology, and surface texture coevolved in the Rhône over the past century and half.

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Section: Effects Of Hydraulic Discontinuity On Sediment Dynamics and Implications For Managementmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Effects of continuous embankments and successive run-of-the-river dams on bedload transport capacities along the Rhône River, France

Vázquez‐Tarrío

Tal

Camenen

et al. 2019

Science of The Total Environment

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Analyse de l’influence d’un barrage à obstruction partielle sur les régimes hydrosédimentaires de la rivière Oubangui (bassin du Congo)

Nzango¹,

Touchart

Bartout³

2019

norois

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Evolution of Sedimentation in a Headrace Canal for Hydroelectric Production Case of the Shongo Basin of the Inga Complex from February 2020 to May 2021 (Kongo Central Province/DR Congo)

Kalonda,

Tshiwis,

Atalatala

et al. 2023

GEP

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The headrace of the Inga hydropower complex is experiencing siltation problems, reducing the exploitable draft and limiting the production capacity of the two main Inga hydropower plants during the low water period. During the 2019 low water period, several sediment slumps occurred in the Shongo basin, disrupting the production of hydroelectric power generated by the Inga 1 & 2 power plant, resulting in massive load shedding of power supply to downstream customers. The cardinal aim of this study is to determine the quantities of sediments deposited and those eroded, in order to know the evolution of sedimentation in the Shongo basin from February 2020 to May 2021. The results obtained show that the running index of the turbines alternators groups is determinant and influences the sedimentation process in the Shongo basin. The cleaning of the Shongo basin in terms of the spatial distribution of sedimentation from February 2020 to May 2021 is plausible.

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Effets des barrages sur la continuité sédimentaire

Cited by 3 publications

References 8 publications

Effects of continuous embankments and successive run-of-the-river dams on bedload transport capacities along the Rhône River, France

Effects of continuous embankments and successive run-of-the-river dams on bedload transport capacities along the Rhône River, France

Analyse de l’influence d’un barrage à obstruction partielle sur les régimes hydrosédimentaires de la rivière Oubangui (bassin du Congo)

Evolution of Sedimentation in a Headrace Canal for Hydroelectric Production Case of the Shongo Basin of the Inga Complex from February 2020 to May 2021 (Kongo Central Province/DR Congo)

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