Effect of debris accumulation on scour evolution at bridge pier in bank proximity

Abstract Large debris transported by flood affects scour features at bridge piers and increases the risks of structural failure. Geometric characteristics relative position pier with respect to river bank are important parameters for process. The interaction between water flow accumulation shear stress, turbulence consequently enhances depth pier. This paper aims analyzing such effects on evolution piers. To this end, two series tests were carried out under clear condition different geometries percentage blockage ratios. Experimental evidences showed that only influences equilibrium morphology low depths. Conversely, its effect becomes negligible higher Useful practical relationships have been derived, satisfactory prediction capability all tested configurations.