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<p>Cascade hydropower stations frequently lead to supersaturated total dissolved gases (TDGs), harming aquatic organisms. In deep reservoirs, thermal stratification and upstream inflow slow TDG release. Using a two-dimensional model of Baihetan Reservoir, we found: (1) thermal stratification remains intact but deepens with increasing inflow; (2) the thermocline restricts supersaturated water movement; and (3) after inflow stops, stratification persists and TDG recovery varies by depth. Overall, the reservoir’s thermal structure critically influences supersaturated water transport and distribution, providing insights into TDG management in deep reservoir operations.</p>

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Response of supersaturated TDG distribution characteristics to thermal stratification in a cascading large deep reservoir

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月20日

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  • Haobai Wang,
  • Jin Wang,
  • Jingjie Feng,
  • Wei Huang,
  • Ruifeng Liang,
  • Ran Li,
  • Chonglin Wang,
  • Kefeng Li

摘要

Cascade hydropower stations frequently lead to supersaturated total dissolved gases (TDGs), harming aquatic organisms. In deep reservoirs, thermal stratification and upstream inflow slow TDG release. Using a two-dimensional model of Baihetan Reservoir, we found: (1) thermal stratification remains intact but deepens with increasing inflow; (2) the thermocline restricts supersaturated water movement; and (3) after inflow stops, stratification persists and TDG recovery varies by depth. Overall, the reservoir’s thermal structure critically influences supersaturated water transport and distribution, providing insights into TDG management in deep reservoir operations.