Resistance capability and hydraulic characteristics of ring-wing plates against local scour of round-ended piers
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Abstract:
Because of the limitations of traditional anti-scour measures for piers, we adopted a new device, ring-wing plate, to protect round-ended piers against scour. The plate changes the flow structure around the pier by reducing the descending flow, and thus reduces the scour of the pier by the descending flow. To study the protective effect of the ring-wing plate on round-ended piers against local scour, we conducted physical model tests with 3 sizes of round-ended piers and 3 installation positions of the ring-wing plate, and analyzed such hydraulic elements as the characteristics of the scour pits around the piers, vertical flow velocity, vertical turbulence intensity, and turbulence shear stress. The results showed that the scour of the 3 types of piers was all reduced, and the medium-sized piers had the greatest reduction in scour among the 3 sizes, with a 30% reduction in the volume of the scour pits. After the ring-wing plate was installed around the medium-sized piers, the vertical flow velocity before the piers declined to 0.039m/s and the vertical turbulence intensity to 0.025m/s; the turbulence shear stress above the plate increased while the turbulence shear stress under the plate decreased. The results indicated that the ring-wing plate can reduce the local scour of piers and has a high practical value.
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