Development of v-shape baffles of stilling basin for large tidal barrier - application for Thu Bo barrier

Abstract

      For large tidal barriers, stilling basins are designed with baffles in order to enhance energy dissipation in the stilling basin. With this type of barrier, the baffle system increases the construction costs. On the other hand, barriers with high water head and lift gate or radial gate, the flow through the gate open is an important factor causing the esosion in downstream. Therefore, the baffles have an important role for dissipation in the stilling basins of large tidal barriers.The study uses the Flow-3D simulation tool to investigate the flow over the tidal barrier. Through the analysis of the simulation results, the classical shape of baffle (trapezoidal shape) is improved and a V-shape baffle is proposed with advantages of hydraulic energy dissipation. With the V-shape baffles, the construction costs are reduced and lower than the stilling basin with trapezoidal shape baffles. The study has been applied for Thu Bo barrier - one of the lagest barriers in the hydraulic work system in the project of flood protection for Ho Chi Minh ciy.