CLARIFICATION OF INNER STRUCTURE IN COMPOUND OPEN CHANNEL FLOWS AND CONSIDERATION OF DISASTER MEASURES FOR RIVER BANK

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Characteristics of inner structure of oblique upward flow and large-scale horizontal vortex that are characteristic coherent structure of compound open channel flow were investigated experimentally. It was clarified that concentration of streamwise vortex in the vicinity of the edge of flood plain results in the oblique upward flow. And it was found that a group of streamwise vortex over the flood plain is the substance of large-scale horizontal vortex and plays important role of generation of shear instability. The results of experimental approaches of the Branch Brock bank protection (BBbp) show that the BBbp has a function of velocity reduction with coherent structure formed on the surface of the BBbp.