Author(s): A. Schlenkhoff; D. B. Bung
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Abstract: Stepped spillways are effective structures in regard to re-aeration processes in hydraulic engineering. It is well-known that the air entrainment process and hence the amount and size of air bubbles depend on geometric and hydraulic boundary conditions. The Civil Engineering Department's Hydraulic Engineering Section at the Bergische University of Wuppertal carried out physical model investigations on a stepped spillway scaled 1:10 with varying step height (s=3cm and s=6cm), slope (▲ and ▲) and discharge (▲) with the objective to analyze the influence of these parameters on the oxygen transfer process. Air-water flow properties, detected with an intrusive double-tip conductivity probe, provide information about the air-water interface available for gas exchange. The aeration efficiency is measured by applying the absorption method according to ASCE (2007) and DWA (2007). A new approach for the determination of the mass transfer velocity is developed.
Year: 2009