Author(s): Steven C. Wilhelms; Michael L. Schneider
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Abstract: Total dissolved gas (TDG) saturation levels were measured and recorded along 3 lateral transects in the immediate area downstream of the Ice Harbor Spillway. The dissolved gas levels were dependent on total spillway discharge and spill pattern, reaching nearly 140 percent at the navigation lock guide wall for the largest discharge. The data showed significant and rapid gas absorption in the stilling basin, with a maximum TDG level of 162 percent at the stilling basin endsill for the largest discharge. A rapid desorption of TDG occurred over the next 200 ft of tailrace, reducing saturation to that measured at the end of the guide wall. These results provide a basis to develop alternative designs to reduce TDG produced at hydraulic structures.
Year: 1997