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LDA MEASUREMENTS OF TURBULENCE CHARACTERISTICS IN TRANSITION FROM RECTANGULAR TO COMPOUND UNSTEADY 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

Yukiko Sakane
Department of Civil and Global Environment Engineering, Kyoto University Kyoto, 606-8501, Japan

Resumo

A time-dependent and depth-varying unsteady compound open-channel flow is one of the most important flows in hydraulic and river engineering. Therefore, the hydrodynamic characteristics of these flows should be investigated in detail. Recently, a lot of researches on unsteady rectangular open-channel flows were conducted intensively and consequently the important knowledge and database are now available. However, 3-D structure of unsteady compound open-channel flows is not available as yet. In particular, turbulent structure and secondary currents at the transition stage from the rectangular to compound channels have not been investigated, because it has been much difficult to measure them even with an LDA system. In this study, LDA measurements were conducted successfully in depth-varying unsteady compound open-channel flows with a channel transition process and 3-D turbulent structures were revealed experimentally.