Author(s): U. Arnold; J. Hottges; G. Rouve
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Keywords: No Keywords
Abstract: The work described is an experimental and theoretical investigation of turbu-lence and mixing mechanisms in compound open channels with extreme flood-plain roughness. Based upon simple turbulence assumptions, algebraic methods were derived to predict local depth-averaged values of velocity, eddy viscosity and eddy diffusivity as functions of directly determinable flow parameters. For verification purposes numerous experiments have been carried out using two-chan-nel on-axis LDV for flow and turbulence measurements, and digital image proces-sing for the investigation of turbulent diffusion and dispersion. The experiment results verify common turbulence assumptions, prove the existence of secondary currents in the main channel, and show some feasibility limits of Boussinesq type turbulence modeling for the given flow problem.
Year: 1989