Page - 180 - in Book of Full Papers - Symposium Hydro Engineering

Increase efficiency of vortex settling basin in imbibition of dam's reservoir in time of Floodwater Amin Hajiahamadi1, Mojtaba Saneie2, Mehdi Azhdari Moghadam3 1 Tecnical Office of Hormozgan Regional water company ,PhD Student, School of Civil Engineering, Shahid Bahonar University of Kerman, Iran. Email:amin.hajiahmadi@yahoo.com 2 Associate Professor, Soil Conservation and Watershed Management Research Institute (SCWMRI), Tehran, Iran. 3 Associate Professor, School of Civil Engineering, The University of Sistan and Baluchestan, Zahedan, Iran. ABSTRACT One obstacle of in imbibition of dam's reservoir in time of Floodwater is the Existence of Suspended sediment in floodwater. On the other hand because the lack of water resources in arid regions, providing of water is dependent on imbibition of dams. Thus existence of Suspended sediment in reservoir's water can malfunction in the imbibition programs. Also Entry of this sediments to hydraulic structures can disorder their Performance. Using vortex settling basins can be suggested as a solution to control the amount of sediments. One of negative point of this basins is settling some part of sediments and not flashing from bottom outlets. In current paper we recommend to use curvature submerge vanes for solving previous problems. The main propose of using this vanes is to adjust and increase the power of vortex flow and to locate the best place for installing curvature submerge vanes in the basin floor. The tests results illustrate that using this vanes with appropriate arrangement can flush out sediments of basin floor, while keeping basins efficiency. The best efficiency is for arrangements which are far away from orifice. More over while increasing Input flow and decreasing radial section of vanes, improves the efficiency of use curvature submerge vanes. Keywords: Efficiency, Sediment, Settling basin, Submerge Vane, Vortex Flow. 1 Introduction Since most rivers pass across loose and erodible areas, they always act as the most important factor of transferring eroded materials from the solid crust of the earth. Disregarding incoming sediments to intakes causes the transfer of sediments into water 180