Undercurrent: The Alden Blog

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Industrial fluid dynamics insights


Zach Taylor
Zach Taylor
Zach Taylor is a hydraulic engineer at Alden, and is a registered professional engineer in the state of Washington. He is located at Alden’s Redmond, Washington physical modeling laboratory. Zach works on computational and experimental modeling projects in a broad range of fields, with a particular focus on spillways and pump stations. His experience also includes coastal modeling, hydrologic modeling, and stormwater management. He has a B.S. and M.S. in Civil Engineering from Colorado State University.

Air Supply Ramps and Cavitation: Total Dissolved Gas Production at High Head Dams – Part 2
Part 1 of this series outlined how high concentrations of total dissolved gas (TDG) can occur downstream from high head dams when their spillways are open, and how this TDG can be harmful or even fatal to fish. Alden has been involved in several recent projects for which the objective was to reduce TDG downstream of high head dams. Alden performed the hydraulic and structural design of roughness elements that break up the high velocity jet of flow discharged from the spillway. TDG production is reduced by these roughness elements because they cause the jet to spread out and thereby reduce the plunge depth in the receiving water, which reduces TDG. The roughness elements work very well at reducing plunge depth, but they can cause cavitation, which can damage the spillway surface and the blocks themselves. The design and implementation of the roughness elements will be topic of another article. The present article focuses on reducing the potential for cavitation on the roughness elements. Alden designed roughness elements have been installed on spillways at Cabinet Gorge and Boundary Dams. Cabinet ...