One-Dimensional Modeling of Suspended Sediment Dynamics in Dam Reservoirs

Guertault, Lucie; Camenen, B.; Peteuil, Christophe; Paquier, André; Faure, J.

doi:10.1061/(asce)hy.1943-7900.0001157

Cited by 17 publications

(9 citation statements)

References 25 publications

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“…Downstream impacts to aquatic species depend on both the magnitude and duration of high sediment concentration, plus factors such as oxygen content in the released water, oxygen demand by the sediment, and the presence of contaminants. Management of drawdown rate, dilution of high concentration flow with clear water, interval between flushing events, timing to avoid spawning or other biologically sensitive periods, and post-flushing releases of clear water can all be important environmental mitigation tools [67][68][69].…”

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confidence: 99%

Classification of Management Alternatives to Combat Reservoir Sedimentation

Morris¹

2020

Water

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Sedimentation is steadily depleting reservoir capacity worldwide, threatening the reliability of water supplies, flood control, hydropower energy and other benefits that form the basis of today’s water-intensive society. The strategies available to combat reservoir sedimentation may be classed into four broad categories. Three proactive categories seek to improve the sediment balance across reservoirs by: (a) reducing sediment yield from the watershed, (b) routing sediment-laden flows around or through the storage pool, and (c) removing deposited sediment following deposition. The fourth category (d) consists of strategies that adapt to capacity loss, without addressing the sediment balance. Successful management will typically combine multiple strategies. This paper presents a comprehensive classification of both proactive and adaptive strategies, consistent with current international practice. Functional descriptions and examples are given for each strategy, and criteria are provided to differentiate between them when there is potential for ambiguity. The classification categories can be used as a checklist of strategies to consider in evaluating sediment management alternatives for new designs as well as remedial work at existing sediment-challenged reservoirs. This will also help practitioners to more clearly describe and communicate the nature of their management activities. Widespread application of both active and adaptive strategies is required to bring sedimentation under control to sustain benefits of water storage for today’s and future generations.

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confidence: 99%

Classification of Management Alternatives to Combat Reservoir Sedimentation

Morris¹

2020

Water

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“…Deux codes de calcul développés à Irstea Lyon ont été utilisés pour cette étude. Le premier, Adis-TS [Guertault et al, 2016], résout l'équation d'advection-dispersion avec une prise en compte des termes sources (érosion et dépôt de sédiments) mais sans évolution effective des fonds. Du fait du couplage faible avec le module hydraulique (MAGE) et de la parallélisation du code de calcul, les simulations peuvent être aisément réalisées sur le long terme (plusieurs décennies) avec une prise en compte de plusieurs classes de sédiments et polluants.…”

Section: Iii1 Codes De Calculs Utilisésunclassified

“…L'objet de ce travail est de proposer une méthodologie d'étude d'une retenue de forme allongée à l'aide d'une modélisation unidimensionnelle (1D) et de montrer les apports de cette modélisation pour l'étude de la dynamique sédimentaire sur des retenues allongées. Ainsi, deux codes de calculs développés à Irstea Lyon (Adis-TS, Guertault et al, [2016] ; RubarBE, El kadi Abderrezzak, K., & Paquier, A. [2009], Camenen et al[2017]) sont appliqués à la modélisation sédimentaire d'une retenue allongée soumise à des opérations de chasse régulières : la retenue de Génissiat sur le Haut-Rhône français.…”

Section: Introductionunclassified

Apport de la modélisation hydro-sédimentaire 1D à l'étude d'une retenue de forme allongée : application à la retenue de Génissiat sur le Haut-Rhône français

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L'étude de la dynamique sédimentaire dans les retenues de barrage reste complexe du fait de la combinaison entre les événements naturels et la gestion du barrage. Dans ce papier, nous montrons l'intérêt de la modélisation numérique pour compléter les études morphologiques basées sur l'analyse de mesures. Dans le cas d'une retenue de forme allongée, cette modélisation peut être réalisée avec des codes numériques unidimensionnels (1D). Les codes 1D RubarBE et AdisTS, développés à Irstea Lyon, ont été appliqués sur la retenue de Génissiat sur le Haut-Rhône français. Ils ont permis de calculer des paramètres hydrauliques utiles au découpage du site d'étude en tronçons homogènes. De plus, les résultats de simulations ont aidé à mettre en évidence la dynamique sédimentaire des trois zones décrivant la retenue, i.e. le tronçon fluvial dominé par le charriage, la retenue amont par la suspension graduée de sables et la retenue aval par la suspension d'argile et de limons. Enfin, la modélisation numérique est utile pour la réalisation de scénarios prédictifs et le test de modes de gestion alternative.

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“…The Adis‐TS code computes changes in suspended sediment concentration using an advection–dispersion equation with source terms for sediment erosion and deposition for several sediment populations (Guertault et al. ). The local bed evolution is calculated as the difference between the erosion and deposition rates.…”

Section: Simulation Of Sediment Transport During Management Operationsmentioning

confidence: 99%

A one‐dimensional process‐based approach to study reservoir sediment dynamics during management operations

Guertault

Camenen²,

Paquier³

et al. 2017

Earth Surf Processes Landf

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A comprehensive understanding of the dynamics of erosion and sedimentation in reservoirs under different management conditions is required to anticipate sedimentation issues and implement effective sediment management strategies. This paper describes a unique approach combining fluvial geomorphology tools and morphodynamic modeling for analyzing the sediment dynamics of an elongated hydropower reservoir subjected to management operations: the Génissiat Reservoir on the Rhône River. Functional sub‐reaches representative of the reservoir morphodynamics were delineated by adapting natural river segmentation methods to elongated reservoirs. The segmentation revealed the link between the spatial and temporal reservoir changes and the variability of longitudinal flow conditions during reservoir management operations. An innovative modeling strategy, incorporating the reservoir segmentation into two sediment transport codes, was implemented to simulate the dynamics of erosion and sedimentation at the reach scale during historic events. One code used a bedload approach, based on the Exner equation with a transport capacity formula, and the other used a suspended load approach based on the advection–dispersion equation. This strategy provided a fair quantification of the dynamics of erosion and sedimentation at the reach scale during different management operations. This study showed that the reservoir morphodynamics is controlled by bedload transport in upper reaches, graded suspended load transport of sand in middle reaches and suspended load transport of fine sediments in lower reaches. Eventually, it allowed a better understanding of the impact of dam management on sediment dynamics. Copyright © 2017 John Wiley & Sons, Ltd.

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One-Dimensional Modeling of Suspended Sediment Dynamics in Dam Reservoirs

Cited by 17 publications

References 25 publications

Classification of Management Alternatives to Combat Reservoir Sedimentation

Classification of Management Alternatives to Combat Reservoir Sedimentation

Apport de la modélisation hydro-sédimentaire 1D à l'étude d'une retenue de forme allongée : application à la retenue de Génissiat sur le Haut-Rhône français

A one‐dimensional process‐based approach to study reservoir sediment dynamics during management operations

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