Scour downstream of submerged parallel radial gates Lotfy Ahmed M1, Basiouny Mohamed E2, Abdelhaleem Fahmy S3, Nasrallah Tarek H3 1Researcher Assistant, Hydraulics Research Institute, National Water Research Center, Egypt 2Prof. Dr., Civil Engineering Department Benha Faculty of Engineering, Benha University, Egypt 3Associate Professor, Civil Engineering Department Benha Faculty of Engineering, Benha University, Egypt Online published on 6 February, 2020. Abstract Scour downstream of hydraulic structures is an inevitable problem that endanger the stability of such structures. Different studies predicted the local scour properties, but always the actual occurred scour dimensions be larger than the studies results. Hydraulic jump affects the characteristics of the scour downstream the rigid floor especially in the case of the submerged hydraulic jump. Previous studies proved that the effect of the submerged hydraulic jump is always greater than the free one. Operation of multi parallel gates has a huge role in the formation of the scour and the characteristics of the downstream hydraulic jump. In this paper, an experimental study was conducted to study the effect of the different symmetrical and asymmetrical operations of parallel radial gates with different flow conditions on the downstream scour. Eighty runs were carried out in a horizontal rectangular flume to study the present phenomenon. Experiments were performed for a range of Froude numbers between 2.58 and 8.38. The results showed a good agreement with the previous studies, and it was found that the relative scour depth increases with the decrease of the submergence ratio and with the increase of the Froude number at vena-contracta for the same expansion ratio. Top Keywords Barrages, Scour, Radial Gates, Submerged hydraulic jump, Physical model. Top |