The promotion effect of aeration on the dissipation of supersaturated total dissolved gas

Ou, Yangming; Li, Ran; Tuo, Youcai; Niu, Jinlan; Feng, Jingjie; Pu, Xunchi

doi:10.1016/j.ecoleng.2016.06.041

Cited by 29 publications

(14 citation statements)

References 17 publications

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“…Moreover, wind can significantly promote the release of supersaturated TDG, and the quantitative relation of release coefficient and wind speed was developed by Huang et al [63]. Besides, turbulence intensity, water-sediment concentration, and river morphology also significantly influence the release rate of TDG [64].…”

Section: Introductionmentioning

confidence: 99%

Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved Gas

Qing

et al. 2021

Advances in Civil Engineering

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Bubble dissolution during the flood discharge creates high total dissolved gas (TDG) concentration zones downstream of the dams. The dissipation of supersaturated TDG is a very slow process. Thus, the elevated TDG may remain through the water body for hundreds of kilometers downstream and lead to gas bubble disease (GBD) and even mortality in fish. To improve the navigation conditions of waterways, dikes (i.e., a solid structure) of varied sizes and shapes are commonly constructed. However, this would affect the dissipation and transportation of the supersaturated TDG. It would significantly change the turbulence intensity and hydropressure of the flow, which dominates the dissipation of TDG. Therefore, TDG distribution in the waterway differs from that in the natural river. In this study, a numerical simulation of the TDG at the Yangtze River’s upper reaches (one of the inland waterways in China) was conducted with the establishment of a two-dimensional TDG dissipation model. The effect of the dikes’ size and shape was analyzed to assess the influence of the regulation structures on the dissipation and transportation of the supersaturated TDG. Meanwhile, simulation in the study area with the natural topography was also set as blank control. Based on that, impact evaluation of TDG supersaturation on fish under different simulation scenarios was made. This study can provide a scientific basis for reducing the adverse effect of supersaturated TDG in fish and the construction of ecological waterway therefore.

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Section: Introductionmentioning

confidence: 99%

Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved Gas

Qing

et al. 2021

Advances in Civil Engineering

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“…In practical engineering applications, there are many solid walls in rivers, such as vegetations under the water and suspended solids in the water, which can easily adsorb the bubble nuclei. The rougher the wall is, the larger the area it provides, and the release process of supersaturated TDG is accelerated 5 . Niu 6 observed that the release rate of supersaturated TDG increased with an increasing amount of activated carbon in water.…”

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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“…In practical engineering applications, there are many solid walls in rivers, such as vegetation and suspended solids, which can easily adsorb bubble nuclei. The rougher the wall is, the larger the area it provides, and the release process of supersaturated TDG is accelerated (Ou et al, 2016). Feng et al (2012) reported that the release coefficient of TDG is positively correlated with the sediment concentration in supersaturated sediment-laden water.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations on the Wall-attached Bubble Growth Process in Water With Supersaturated Total Dissolved Gas

Lü

Feng

et al. 2021

Preprint

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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. Based on the wall-attached bubble growth rate calculation method applied in this paper, a formula of the supersaturated TDG adsorption flux based on wall-attached bubbles was proposed, and a prediction method of the TDG release coefficient was established. The simulation results show that with increasing relative vacuum degree, the TDG coefficient increases correspondingly, and the adsorption mechanism of vegetation surface area can be obviously promoted under lower environmental pressure. 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 environmental conditions.

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The promotion effect of aeration on the dissipation of supersaturated total dissolved gas

Cited by 29 publications

References 17 publications

Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved Gas

Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved Gas

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

Experimental Investigations on the Wall-attached Bubble Growth Process in Water With Supersaturated Total Dissolved Gas

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