BED VARIATION AND FLUID FORCES AROUND NEIGHBORING TWO PIERS

Abstract

Bridge piers are often built near by. It is very important to estimate the hydrodynamic forces acting on piers and maximum scour depth around them for their safety and economical design. In this paper, two cylindrical piers were set in a straight channel of movable bed that were apart at a distance of four times of their diameter in the longitudinal direction of flow. Based on the detail measurement of the pressure, velocity and bed variation around the cylinders, the structure of flow and the fluid forces were clarified. Fluid forces and maximum depth of scour were compared with the case of single pier experiment.