Topographic Evolution around Twin Piers in a Tandem Arrangement

摘要

This laboratory study investigates the 2-D topographic evolution of a sand bed with cylindrical bridge piers arranged in tandem. The results of clear-water scouring experiments around two piers show that shapes of topography were similar for different spacing and scour duration. Fractal theory and statistical analysis were used to estimate the statistical properties of the evolution of the sand-bed topography around the piers. The statistical properties of the bed surface contours remained almost stationary under continuing scouring action. Finally, the difference of local scour depth between two piers with scour time can be segregated into three regions: sheltering region, co-effect region and stabilizing region.