粗度近傍の組織的流速変動場が相対水深の小さな流れの乱流構造に及ぼす影響

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  • Turbulent Structure of Flow with Small Relative Submergence Affected by Organized Fluctuation Due to Vortex-Sheddings from Roughness Elements

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Flow with small relative submergence has different turbulent structure from that with sufficient submergence, particular in the vicinity of the bottom, affected by vortex-sheddings from individual roughness elements, and it might play a role on fluvial process in mountain streams. Turbulence measurements clarifies that uniformalization of mean velocity profile and suppression of turbulence intensity and Reynolds-stress in the “roughness sublayer”, and the velocity fluctuation in this layer is characterized of inherent lower-frequency component in its spectrum and somewhat organized or periodical structure. The turbulent properties with stable organized structure such as cellular secondary currents is explained by formulating the organized fluctuation and temporal averaging, while those in the roughness sublayer, in which the organized motion is unstable or not fixed, is explained by further spatial averaging of the properties brought about by organized motion.

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