Experimental investigations on the dissipation process of supersaturated total dissolved gas: Focus on the adsorption effect of solid walls

Yuan, Youquan; Huang, Juping; Wang, Zhenhua; Gu, Yang; Li, Ran; Li, Kefeng; Feng, Jingjie

doi:10.1016/j.watres.2020.116087

Cited by 15 publications

(12 citation statements)

References 32 publications

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“…Rapid dissipation of TDG resulted in almost no effect on eDNA decay in flowing water. But in the natural environment, TDG supersaturation continues to occur in rivers downstream of high dams, and it is difficult to release quickly into the atmosphere and could be transported over long distances (Yuan et al, 2020). Accordingly, in natural rivers, the effect of TDG supersaturation on biological eDNA might be similar to that in still water of this study.…”

Section: Relationship Between Experimental Results and Natural Enviro...mentioning

confidence: 58%

Effects of total dissolved gas supersaturation and sediment on environmental DNA persistence of grass carp (Ctenopharyngodon idella) in water

Huang

Zhang

Wang

2022

Front. Environ. Sci.

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Environmental DNA (eDNA) technology has become an alternative tool for monitoring aquatic communities due to its sensitive, economical, and non-invasive properties. However, the application of this technique is often limited by the complexity of environmental conditions, which often poses a barrier to the transmission of biological information. Here, we conducted a series of experiments with grass carp as the target species to evaluate the effects of total dissolved gas (TDG) supersaturation and sediment on the persistence of eDNA under different flow conditions. The results showed TDG supersaturation promoted eDNA decay in still water but with no significant effect in flowing water for rapid dissipation of TDG. For sediment, its presence accelerated the decay of eDNA no matter the flow conditions. The grass carp eDNA showed an exponential decay pattern in water and the decay rate constant decreased gradually with time. Our study highlights the importance of integrating experimental results with the natural environment and provides an important reference for species monitoring using eDNA technology in aquatic ecosystems with high dams built.

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Section: Relationship Between Experimental Results and Natural Enviro...mentioning

confidence: 58%

Effects of total dissolved gas supersaturation and sediment on environmental DNA persistence of grass carp (Ctenopharyngodon idella) in water

Huang

Zhang

Wang

2022

Front. Environ. Sci.

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“…The findings demonstrated that the main influences on the concentration distribution of TDG were inflow TDG, secondary flow, and turbulence intensity. In addition, some researchers studied the effects of vegetation and solid surface on the release process of supersaturated TDG and found that the presence of vegetation and rough solid surface accelerated the release of supersaturated TDG (H. Z. Wang et al., 2018; Z. H. Wang et al., 2019; Y. Q. Yuan et al., 2018a, 2018b, 2020).…”

Section: Factors Influencing Tdg Supersaturationmentioning

confidence: 99%

“…Y. Q. Yuan et al. (2020) demonstrated the adsorption characteristics of solid walls on TDG through a series of studies. To speed up the release of supersaturated TDG, specific engineering measures might be performed to increase wall roughness.…”

Section: Abatement Measures Of 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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“…Yuan 7 proposed a supersaturated TDG dissipation model to describe the function of wall adsorption of TDG, and the equation for the adsorption flux of supersaturated TDG over a unit time was achieved from a macroscopic perspective. Based on experiments focusing on the adsorption effect of solid walls, the quantitative relationship between the adsorption coefficient and contact angle of solid surfaces was obtained 8 . Li 9 experimented on a superheated superhydrophobic surface to study the formation and escape of single bubbles on the vessel wall, and revised Zuber's 10 prediction equation of the bubble escape diameter and frequency, and obtained the relationship between gas–liquid interface surface tension, liquid density, and equilibrium bubble diameter.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on the growth of wall-attached bubble in total dissolved gas supersaturated water

Lü

Feng

et al. 2022

Sci Rep

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Due to dam discharge, waterfalls, sudden increases in water temperature and oxygen production by photosynthesis, the total dissolved gas (TDG) in water is often supersaturated, which may have serious effects on aquatic ecology. When the atmospheric pressure is lower than the TDG pressure in water, the supersaturated dissolved gas in water will slowly release into air. Wall-attached bubbles were formed during the TDG release process. The generation and departure of wall-attached bubbles influence the release process of TDG in water. To simulate the growth period of the wall-attached bubbles under different pressures, a decompression experimental device was designed to record the supersaturated TDG release process. Based on experimental data and mathematical calculations, the quantitative relationship between the bubble growth rate and environmental pressure was obtained. The supersaturated TDG dissipation rate increases monotonically with increasing relative vacuum degree. Applied the calculation method about the wall-attached bubble growth rate, a formula of the supersaturated TDG adsorption flux was proposed, and a prediction method of the TDG release coefficient was established. The simulation results show that with the increasing relative vacuum degree, the TDG release coefficient increases correspondingly, and the adsorption from wall surface area can be obviously promoted. This study provides an important theoretical basis for the accurate calculation of the TDG release process and provides a scientific basis for the accurate prediction of the spatial and temporal distribution of supersaturated TDG under different pressure and solid wall conditions.

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Experimental investigations on the dissipation process of supersaturated total dissolved gas: Focus on the adsorption effect of solid walls

Cited by 15 publications

References 32 publications

Effects of total dissolved gas supersaturation and sediment on environmental DNA persistence of grass carp (Ctenopharyngodon idella) in water

Effects of total dissolved gas supersaturation and sediment on environmental DNA persistence of grass carp (Ctenopharyngodon idella) in water

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

Experimental investigations on the growth of wall-attached bubble in total dissolved gas supersaturated water

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