Numerical simulation on optimization scheme of permeable hole of permeable sheet piling spur dike

Abstract

Aimed at the problems about that permeable hole number and permeable hole layout of Permeable Sheet Piling Spur Dike (PSPSD) affecting the flow characteristic at spur dike area, CCHE2D flow simulation mathematical model is adopted, two dimensional flow numerical simulation is carried out for the permeable spur dike area of the physical model of the Qiman reach of the Tarim River main stream. The change law of cross section flow velocity, water level with different permeable hole number and layout are analyzed. The optimization scheme of permeable hole for the PSPSD is sought. The results show that the more number of permeable hole of the PSPSD, the higher the water level upstream of the spur dike, the lower the water level downstream of the spur dike, the smaller the flow velocity upstream and downstream of the spur dike, the better the velocity uniformity. The optimization scheme for the permeable spur dike with the best effect of flow retardation is that the number of permeable holes is 4 holes, and the spacing of permeable hole decreases gradually from the root to the head of the spur dike, which accounts for 9%, 8%, 7% and 6% of the length of the PSPSD respectively.