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3-D NUMERICAL SIMULATION OF TURBULENT STRUCTURE IN TIME-DEPENDENT AND DEPTH-VARYING UNSTEADY COMPOUND OPEN CHANNEL FLOWS

Iehisa Nezu
Dept. of Global Environment Engineering, Kyoto University Kyoto, 606-8501, Japan

Michio Sanjou
Department of Civil and Global Environment Engineering, Kyoto University Kyoto, 606-8501, Japan

Resumo

There are a lot of previous studies on compound open-channel flows, because such a two-stage flow with a lower main-channel and floodplains is one of the most important flows for water disaster prevention, valuable open-spaces of aquatic lives and river ecosystems. However, there are quite few studies on three-dimensional (3-D) structures in depth-varying unsteady compound open-channel flows. In this study, a 3-D time-dependent numerical model is developed and applied to such unsteady depth-varying compound free-surface flows. The calculated results are compared with the reliable experimental database of LDA, and the unsteadiness properties of mean velocity and turbulence structures are discussed in detail.