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Effect of Tailwater Depth on the Scour Downstream of Falling Jets
In this paper the results of an experimental study about effect of tailwater depth on the characteristics of local scour at downstream of falling jets is presented. A flume with 5m length, 25cm height and 10cm width has been established. Jets with three shapes including; circular, square and rectangular are connected to the end of the flume. A Siliceous bed with d50=1.27mm, three drop heights including; 35cm, 65cm and 95cm and three tailwater depth; 6cm, 12cm and 18cm have been applied downstream of the jet. Different analysis of the observed data showed that the characteristics of scour-hole depend on erosion parameter, F0/(Hc/RH), and tailwater parameter, Tw/RH. Also it is considered that increasing the tailwater depth from 6cm to 12cm and then to 18cm, at first causes increasing the depth, width and length of scour-hole and also the length of sediments mound on the average of 104, 42, 39 and 83%, respectively, then causes decreasing these characteristics on the average of 23, 24, 18 and 16%, respectively. In this case the height of sediments mound at downstream of scour-hole will increase on the average of 52%. Finally, an equation as the scour characteristics predictor is proposed.
Effect of Tailwater Depth on the Scour Downstream of Falling Jets
In this paper the results of an experimental study about effect of tailwater depth on the characteristics of local scour at downstream of falling jets is presented. A flume with 5m length, 25cm height and 10cm width has been established. Jets with three shapes including; circular, square and rectangular are connected to the end of the flume. A Siliceous bed with d50=1.27mm, three drop heights including; 35cm, 65cm and 95cm and three tailwater depth; 6cm, 12cm and 18cm have been applied downstream of the jet. Different analysis of the observed data showed that the characteristics of scour-hole depend on erosion parameter, F0/(Hc/RH), and tailwater parameter, Tw/RH. Also it is considered that increasing the tailwater depth from 6cm to 12cm and then to 18cm, at first causes increasing the depth, width and length of scour-hole and also the length of sediments mound on the average of 104, 42, 39 and 83%, respectively, then causes decreasing these characteristics on the average of 23, 24, 18 and 16%, respectively. In this case the height of sediments mound at downstream of scour-hole will increase on the average of 52%. Finally, an equation as the scour characteristics predictor is proposed.
Effect of Tailwater Depth on the Scour Downstream of Falling Jets
Jahromi, S. H. Musavi (author) / Nasserian, H. Helalat (author)
International Conference on Scour and Erosion (ICSE-5) 2010 ; 2010 ; San Francisco, California, United States
Scour and Erosion ; 688-696
2010-10-29
Conference paper
Electronic Resource
English
Effect of Tailwater Depth on the Scour Downstream of Falling Jets
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