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Experimental and field study on dissipation coefficient of supersaturated total dissolved gas

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Abstract

The elevated supersaturation of total dissolved gas (TDG) downstream of a high-dam spill has deleterious effects on fish in a large range. A one-dimensional (1-D) longitudinal model is optimal for the prediction of supersaturated TDG dissipation over a long distance. The key issue of the model is to determine the dissipation coefficient accurately. In agreement with field observations and experiment data, dimensional analysis and regression were performed to propose a formula for estimating the dissipation coefficient of supersaturated TDG in various rivers and reservoirs, and it involves the effects of the turbulence intensity, the hydro-pressure and the solid-liquid interface. The friction velocity, water depth, hydraulic radius and Froude number are independent variables in the formula which are easy to determine in practical applications. The 1-D longitudinal model is implemented to calculate the dissipation of TDG in a reach of the Jinsha River. Good agreement is found between the calculated results and field data for both the dissipation coefficient and the dissipation process.

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Authors and Affiliations

  1. State Key Laboratory of Hydraulics and Mountain River Engineering (Sichuan University), Chengdu, 610065, China

    Jing-jie Feng  (冯镜洁), Ran Li  (李然), Qian Ma  (马倩) & Le-le Wang  (王乐乐)

Authors
  1. Jing-jie Feng  (冯镜洁)
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  2. Ran Li  (李然)
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  3. Qian Ma  (马倩)
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  4. Le-le Wang  (王乐乐)
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Corresponding author

Correspondence to Ran Li  (李然).

Additional information

Foundation item: Projects(51179111, 51279115) supported by the National Natural Science Foundation of China; Project(20110181110073) supported by the Doctoral Programs Foundation of Ministry of Education of China

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Feng, Jj., Li, R., Ma, Q. et al. Experimental and field study on dissipation coefficient of supersaturated total dissolved gas. J. Cent. South Univ. 21, 1995–2003 (2014). https://doi.org/10.1007/s11771-014-2148-4

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  • DOI: https://doi.org/10.1007/s11771-014-2148-4

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