Abstract
AbstractThe total dissolved gas (TDG) supersaturation that results from dam spillage may cause adverse effects, including increases in the risk of gas-bubble disease and mortality in fish. The accu...
Highlights
When dam spillage occurs, large amounts of air are entrained into the discharged water
The results indicate that the retention time of aerated water at a given pressure has a strong effect on total dissolved gas (TDG) saturation
This work summarized the development of a predictive model for TDG supersaturation downstream of high-dam hydropower projects with plunging jet flow
Summary
Large amounts of air are entrained into the discharged water. Because of the complexity of the flow field in stilling basins (Fig. 6), the study of retention time is a challenging aspect of assessing the production of elevated TDG levels. An experimental method similar to that described by Levenspiel (1962) was applied to assess the effects of the retention time in stilling basins using physical models of several high dams with a plunging jet. The effects of both the operational parameters of each dam (i.e., flow rate and water head) and their structural characteristics (i.e., type of energy dissipation used and size of the stilling basin) were investigated.
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