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1. Relationships between Total Dissolved Gas and Dissolved Oxygen in Water | |||
MA Qian,LI Ran,FENG Jingjie,WANG Lele | |||
Hydraulic Engineering 25 June 2013 | |||
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Abstract:Supersaturated dissolved gas can cause gas bubble disease in fish, potentially increasing their mortality. Previous studies have indicated that total dissolved gas (TDG) has a more serious impact on fish than other dissolved gases, such as dissolved oxygen (DO) or dissolved nitrogen. However, for many reasons, dissolved oxygen (DO) concentrations are generally used as a proxy for determining total dissolved gas (TDG) concentrations. Here, the relationships between TDG and DO concentrations are discussed relative to laboratory experiments and field TDG concentrations downstream of dam projects in China. The relationship between TDG and DO varied with time and space, and no clear or fixed relationship was observed between TDG and DO. Therefore, using DO concentrations to predict TDG supersaturation may result in large errors, and it is thus not appropriate to use DO concentrations as a predictor of TDG concentrations. | |||
TO cite this article:MA Qian,LI Ran,FENG Jingjie, et al. Relationships between Total Dissolved Gas and Dissolved Oxygen in Water[J]. |
2. Study of dams\ | |||
Zhangping Wei,Han Chang-hai | |||
Hydraulic Engineering 20 October 2009 | |||
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Abstract:The continuous ecosystems of natural rivers are altered by construction of dams, which has several negative impacts on fishes. Those mainly includes: (1) Barrier of fishes migration routes, (2) Changes of hydrological and hydraulic conditions for fishes spawning, (3) Reduction and destruction of habitats, (4) Influences of gas supersaturation, (5) Influences of discharged low-temperature water. This paper summarizes some research achievements home and abroad, and then it offers two kinds of solutions to those problems: One is engineering measure, such as installing environmentally friendly hydropower turbines and building ecological fish passages in hydraulic structures; the other is non-engineering measure, which includes Fishes Nature Reserves, ecological compensation and regulation, artificial propagation and stocking, etc. | |||
TO cite this article:Zhangping Wei,Han Chang-hai. Study of dams\[OL].[20 October 2009] http://en.paper.edu.cn/en_releasepaper/content/35937 |
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