TURBULENCE CHARACTERISTICS OF COMPOUND OPEN CHANNEL FLOW WITH DISCONTINUOUS FLOOD PLAIN

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  • 不連続高水敷を有する複断面開水路流れの乱流特性

Abstract

<p> The characteristics of the turbulent structure of a compound open channel with a discontinuous flood plain were examined using a flow velocity measurement method and a flow visualization method. The inside of discontinuous flood plain (cavity region) becomes a relatively low speed region, and large and small circulating flows centered on the vertical direction are formed. A region with a large horizontal Reynolds stress (-uw) is formed at the boundary between the cavity region and the main channel. In addition, a region with a large vertical Reynolds stress (-uv) is formed at the boundary between the cavity and the upper surface of the flood plain. Longitudinal vortex structures formed at the tip and upper surface of the upstream flood plain flow down stably into the cavity region, and they contribute to the generation of Reynolds stress by the vortex motion of the separation shear layer.</p>

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