Experimental Study of Chute Bed Roughness Height on Energy Dissipation
2019
beiranvand, fereshteh | سلماسی, فرزین | فرسادی زاده, داود
Chutes are the most common water conveyance structures in dams. In this study the effect of chute bed roughness height on energy dissipation has been investigated. To do so first general non dimensional relationship was developed. Then series of experimental tests were conducted in a physical model using bed slopes 25 and 35 degree and four different uniform roughness heights (3.38, 7, 12.7, 38.1 mm). Total of 80 tests were conducted with flow discharges ranged between 4 and 40(LS^(-1)). Results show that in comparison with the smooth bed, nearly 7 to 38 percent of the flow energy was dissipated on the roughened bed chute. Maximum energy dissipation occurred for roughness height 38.1 mm and the minimum energy was dissipated on 3.38 mm roughness. A relationship was developed for prediction of energy slope on this type roughened bed chutes and the results obtained were compared with the results of previous works.
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