Experimental study on Determining of Scour hole at Plunging jet under weirs (2006-2008)
2008
Saneie, Mojtaba
Determining of scour hole at plunging jet under weirs is one of the most hydraulic engineering problems. Weirs are used widely in flood spreading projects, check dams and drop structures at watershed management and irrigation projects. Water discharges vertically over free fall weirs. Flowing water over weir and biting on erosive bed material at downstream of weir is caused scouring and plunge pool. Experimental study on determine of scour hole at plunging jet under weirs is main subject in this research. Designing and construction of physical modeling by different bed material (cohesion less and uniform), effect of discharge, different depth at U/D stream weir and tale water changing depth are studied to forming of scouring hole. Main effective factors are studied that effect on shape and size of scour hole. Mathematical relationship is provided to prediction of scour hole shaping. The results illustrated that dimensionless parameters, length and depth of scour hole, X/Ls, Y/ds, are independent of time.
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