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Raziskava tokovnih razmer na bočnem prelivu z uporabo vizualizacijske metode = Study of flow at side weir using visualization method
Novak, Gorazd, gradbeništvo/hidrotehnika, 1978- ; Steinman, Franci ; Bajcar, Tom
This paper presents a reliable method for accurate non-contact measurements ofvelocity field and longitudinal water surface profiles at model side weir and should prove valuable in investigations of ...flood overflow structures, which are being designed within the framework of future hydro power plants on the Sava River in Slovenia. We focused on the influence of downstream main channel weir Zg on the lateral discharge Qs over a sharp-crested rectangular side weir. Quantification of velocity fields using visualization method showedthat velocities at side weir were not uniform. Longitudinal components of overflow velocities U were greater than corresponding main channel cross section average velocities V, except in stagnation zone that formed at the downstream end of the side weir. Measured side weir discharges were in good agreement with calculated values, using discharge coefficient Cd from the momentum-approach-based equation by May et al. [7] and the energy-approach-based equation by Singh et al. [11]. As an additional result, a new phenomenological model for Cd is proposed to illustrate the influence ofZg on Qs.
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