Experimental study of the dissipation of supersaturated TDG during the jet breakup process

Han, Xue; Ma, Qian; Li, Ran; Diao, Ming; Zhu, David Z.; Lu, Jingying

doi:10.1007/s42241-018-0106-6

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…H. C. Xue et al. (2019) studied the saturation change in the process of a jet breaking through indoor experiments from the perspective of the cumulative effect of TDG in the basin and established the relationship between the initial TDG level and the residence time of jet in the air.…”

Section: Research Methods For Tdg Supersaturationmentioning

confidence: 99%

Generation and Release Mechanism and Abatement Measures for Gas Supersaturation Downstream of Hydropower Dams: A Review

Zhang,

Fu,

et al. 2023

Water Resources Research

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Despite the considerable social and economic benefits of hydropower dams, they can cause total dissolved gas (TDG) supersaturation downstream of hydropower dams, which can harm fish through gas bubble trauma (GBT) and cause issues with aquatic ecology. This paper systematically reviewed the generation and release mechanism of TDG supersaturation, including three stages of TDG generation and release, to broaden the research ideas of TDG supersaturation and encourage the construction of environmentally friendly dams and other hydropower projects. The factors affecting the generation and release were summarized from the three stages of TDG generation and release, including temperature, momentum difference at the water‐air interface, and effective depth of bubble arrival. The research methods were introduced from four aspects: theoretical methods, field observations, experiments, and numerical simulations. The advantages, disadvantages, and application scopes of different research methods were outlined. Finally, the abatement measures in the three stages of TDG generation and release were introduced from the engineering and non‐engineering perspectives, and the future research directions were pointed out from the four aspects of TDG supersaturation generation and release mechanism, research methods, abatement measures, and management methods, including in‐depth study of whether gas‐liquid transfer through bubble surfaces or free surfaces dominates, consideration of bubble coalescence and rupture to improve the accuracy of numerical methods in TDG supersaturation prediction, the combination of engineering and non‐engineering measures to optimize TDG supersaturation abatement measures and consideration of artificial intelligence technology to improve hydropower project management methods.

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Section: Research Methods For Tdg Supersaturationmentioning

confidence: 99%

Generation and Release Mechanism and Abatement Measures for Gas Supersaturation Downstream of Hydropower Dams: A Review

Zhang,

Fu,

et al. 2023

Water Resources Research

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“…When a large volume of water with high head is released from a dam, the water jet entrains a large amount of air to form aerated water, and drops deeply into the energy dissipation pool near the dam (Bertola et al., 2018). Due to high water pressure in the pool, the air carried by the water jet dissolves rapidly, forming TDG supersaturation in the water (Pulg et al., 2016; H. Xue et al., 2018). The degree of TDG supersaturation in the stilling pool is positively correlated to the bubble retention time (Lu et al., 2019; Y. Peng, Lin, et al., 2022).…”

Section: River Damming Impacts On Fish Physical Habitatmentioning

confidence: 99%

River Damming Impacts on Fish Habitat and Associated Conservation Measures

Chen,

Li,

Lin

et al. 2023

Reviews of Geophysics

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River damming has brought great benefits to flood mitigation, energy and food production, and will continue to play a significant role in global energy supply, particularly in Asia, Africa, and South America. However, dams have extensively altered global river dynamics, including riverine connectivity, hydrological, thermal, sediment and solute regimes, and the channel morphology. These alterations have detrimental effects on the quality and quantity of fish habitat and associated impacts on aquatic life. Indeed, dams have been implicated in the decline of numerous fishes, emphasizing the need for effective conservation measures. Here, we present a global synthesis of critical issues concerning the impacts of river damming on physical fish habitats, with a particular focus on key fish species across continents. We also consider current fish conservation measures and their applicability in different contexts. Finally, we identify future research needs. The information presented herein will help support sustainable dam operation under the constraints of future climate change and human needs.

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“…A previous study in the upper Yangtze River could only explain the characteristics of one species with specific size, and a consistent pattern that could be applied to all the resident fish was not established. While some scholars have developed mathematical models to predict TDG supersaturation downstream from a dam, mathematical models that can accurately predict fish behaviour in TDG‐supersaturated water are still rare (Li et al, 2009; Lu et al, 2019; Ma, Li, Feng, Lu, & Zhou, 2018; Xue et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Tolerance and avoidance mechanisms of the rare and endemic fish of the upper Yangtze River to total dissolved gas supersaturation by hydropower stations

Wang

Liang

et al. 2020

River Research & Apps

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Several superhigh dams (greater than 200 m in height) and many high dams have been built in the upper Yangtze River basin in recent years, and these dams have made total dissolved gas (TDG) supersaturation a serious environmental problem. A few studies have examined the tolerance and avoidance characteristics of rare and endemic fish in TDG‐supersaturated water in the upper Yangtze River over the past 10 years. These studies focused on specific species and specific sizes and did not identify a regular pattern that can be applied to all resident fish in the upper Yangtze River. However, elucidating this type of pattern is crucial for fishery management and dam operations in the upper Yangtze River. Data on the median lethal time (LT50), horizontal avoidance percentage, and vertical water depth of three rare and endemic species in the upper Yangtze River from previous studies were used in the current work. An exponential relationship was found between LT50 of fish and TDG supersaturation. The avoidance percentage of fish has a linear relationship with TDG supersaturation. Fish in the upper Yangtze River can use depth compensation to avoid the threat of TDG when the saturation is 130% or above but rarely avoid the threat of TDG when the saturation is less than 125%. We also described the tolerance and avoidance characteristics of fish in a TDG‐supersaturated river downstream from a super‐high dam. When the dam discharged a two‐year flood, the LT50 values of fish downstream ranged from 9.1 to 27.5 hr regardless of depth compensation. The avoidance percentage of resident fish ranged from 8.4 to 44.8%. The resident fish swam to a water depth of 2.43–3.33 m to avoid the threat of TDG.

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Experimental study of the dissipation of supersaturated TDG during the jet breakup process

Cited by 7 publications

References 19 publications

Generation and Release Mechanism and Abatement Measures for Gas Supersaturation Downstream of Hydropower Dams: A Review

Generation and Release Mechanism and Abatement Measures for Gas Supersaturation Downstream of Hydropower Dams: A Review

River Damming Impacts on Fish Habitat and Associated Conservation Measures

Tolerance and avoidance mechanisms of the rare and endemic fish of the upper Yangtze River to total dissolved gas supersaturation by hydropower stations

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