سال انتشار: ۱۳۸۳
محل انتشار: کنفرانس بینالمللی هیدرولیک سدها و سازههای رودخانهای
تعداد صفحات: ۶
S.M. Borghei – Civil Engineering Department, Sharif University of Technology
A. Nazari – Civil Engineering Department, Sharif University of Technology
A.R. Daemi – Water Planning Bureau, Ministry of Energy
The flow pattern at channel junctions is a complicated matter specially when loose boundary is included. There are many parameters which influence the scouring profile due to junction. Some of the important ones, which have been studied in this research, are: channels and junction geometry, discharge ratio, downstream Froude number, as well as, sediment size. The results from experimental tests at channel junction are presented. The experiments were carried out with 3 different ratios of branch to main channel width. The results show that maximum scouring depth happens further downstream of the junction (longitudinal and transverse) and not at the junction itself. This is more extreme for smaller grain size. Also, when branch channel has smaller width to main channel, the length of scour hole becomes larger while the depth does not change much. Another important result is the effect of connection geometry of the channels which, a chamfer or non-sharp edge reduces the scouring dramatically. Finally, the complete results are presented as graphs.