DEVELOPMENT OF AN IMAGE-BASED TURBULENCE MEASUREMENT METHOD UTILIZING SMALL TEMPERATURE DIFFERENCES ON THE WATER SURFACE OF A RIVER

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  • 河川流の水面の微小温度差を利用した可視化乱流計測方法の開発

Abstract

<p> Space-Time Image Velocimetry (STIV) is a flow visualization method specified to measure the surface velocity distribution of rivers by tracing the surface waves that emerge on the river surface due to the turbulence of the water flow. Surface tracers are distributed for measuring low water flow in which the surface waves are indistinct. Surface tracers gather to the converging area of surface velocity, resulting in inhomogeneous tracer density, which causes problems in statistical analysis. The temperature difference between the river bed, the water flow and the atmosphere and the turbulence cause slight variations in the surface water temperature in the river flow. The turbulence characteristics were analyzed utilizing image acquisition by a mid-wavelength infrared camera and the unique feature of STIV, and then obtained flow characteristics were compared with the results obtained with PIV. The results suggest that the proposed method can more accurately acquire turbulent statistics.</p>

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