Prediction of Total Dissolved Gas Exchange at Hydropower Dams

Hadjerioua, Boualem; Pasha, Fayzul K; Stewart, Kevin; Bender, M. D.; Schneider, Michael L.

doi:10.2172/1050299

Cited by 3 publications

(1 citation statement)

References 18 publications

(13 reference statements)

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“…One alternative to minimize TDG supersaturation is to install deflectors on the spillway face to redirect the regular plunging flow to surface jets tangential to the free surface (Politano et al, 2016). This structure was used or is being evaluated in others hydropower plants (HPP) such as Hells Canyon Dam (Politano et al, 2016); McNary Dam (Politano et al, 2015;Wang et al, 2018); Wanapum Dam (Hadjerioua et al, 2014); Brownlee Dam (Myers & Parkinson, 2003) and Yacyretá HPP (Bacchiega & Fattor, 2014).…”

Section: Introductionmentioning

confidence: 99%

Installation of deflector in Colider Dam to minimize the percentual of total dissolved gases

Andriolo,

Araújo,

Fontanelli

et al. 2023

RBRH

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During voluntary or involuntary spills, the total dissolved gas (TDG) may increase with potential of causing gas bubble disease (GBD) in affected fish. Bubbles entrained during spill events in Colider are transported by plunging jets to deep, high pressure, regions in the tailrace where dissolution is enhanced increasing TDG concentrations. The most common alternative to minimize TDG supersaturation downstream of hydropower dams is to install deflectors on the spillway face. In order to reduce TDG levels downstream of the Colider's spillway, Copel retrofitted the four spillway bays with deflectors, finalizing the construction in November 2021. The design of the deflectors were assisted with two studies. The first study comprised the development of a physical model in 1:60 scale, and other study was a numerical model based on the open-source toolbox OpenFoam.

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Section: Introductionmentioning

confidence: 99%

Installation of deflector in Colider Dam to minimize the percentual of total dissolved gases

Andriolo,

Araújo,

Fontanelli

et al. 2023

RBRH

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Cumulative effects of cascade hydropower stations on total dissolved gas supersaturation

Feng

et al. 2018

Environ Sci Pollut Res

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Elevated levels of total dissolved gas (TDG) may occur downstream of dams during the spill process. These high levels would increase the incidence of gas bubble disease in fish and cause severe environmental impacts. With increasing numbers of cascade hydropower stations being built or planned, the cumulative effects of TDG supersaturation are becoming increasingly prominent. The TDG saturation distribution in the downstream reaches of the Jinsha River was studied to investigate the cumulative effects of TDG supersaturation resulting from the cascade hydropower stations. A comparison of the effects of the joint operation and the single operation of two hydropower stations (XLD and XJB) was performed to analyze the risk degree to fish posed by TDG supersaturation. The results showed that water with supersaturated TDG generated at the upstream cascade can be transported to the downstream power station, leading to cumulative TDG supersaturation effects. Compared with the single operation of XJB, the joint operation of both stations produced a much higher TDG saturation downstream of XJB, especially during the non-flood discharge period. Moreover, the duration of high TDG saturation and the lengths of the lethal and sub-lethal areas were much higher in the joint operation scenario, posing a greater threat to fish and severely damaging the environment. This work provides a scientific basis for strategies to reduce TDG supersaturation to the permissible level and minimize the potential risk of supersaturated TDG.

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Modeling total dissolved gas (TDG) concentration at Columbia river basin dams: high-order response surface method (H-RSM) vs. M5Tree, LSSVM, and MARS

et al. 2019

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Prediction of Total Dissolved Gas Exchange at Hydropower Dams

Cited by 3 publications

References 18 publications

Installation of deflector in Colider Dam to minimize the percentual of total dissolved gases

Installation of deflector in Colider Dam to minimize the percentual of total dissolved gases

Cumulative effects of cascade hydropower stations on total dissolved gas supersaturation

Modeling total dissolved gas (TDG) concentration at Columbia river basin dams: high-order response surface method (H-RSM) vs. M5Tree, LSSVM, and MARS

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