Experimental study of local scour downstream of cylindricl bridge pier

Scour is a natural phenomenon caused due to the erosive action of flowing stream on alluvial beds which removes the sediment around or near structures located in flowing water. It means the lowering of the riverbed level by water erosions such that there is a tendency to expose the foundations of a structure. The failure of bridges piers are due to many reasons such as localized scour combined with general riverbed degradation. In this study we try to investigate the temporal variation of scour depth at uniform cylindrical bridge pier with different diameters. The experimental work is carried out in the hydraulic laboratory of civil engineering at Gaziantep University on a channel have dimensions of 8.3m length, 0.8m width and 0.9m depth. The experiments will be carried on 20 cm depth of sediment layerhaving d50=0.4 mm. Three bridge pier shapes having different scaled models will be constructed in a 1.5m of test section in the channel. In this study, predicted maximum scour depth equation was found by using analysis program, depending on experimental data.Keywords: scour, local scour, bridge piers, scour depth.