Author(s): Iraj Gholami; Alireza Daemi; Ali A. Salehi Neyshabouri
Linked Author(s): Seyed Ali Akbar Salehi Neyshabouri
Keywords: Sluiceway; Dividing wall; Sluice; Weir; Sediment
Abstract: In design of diversion dams; it is usually necessary to include a sluiceway to remove the deposited sediment in front of the inlet structures. One of the main points regarding the removal of deposited sediment upstream of weir and mainly in the vicinity of the inlet structures is the extent of the eroded area. It has been observed that sluiceway operation result in the eroded bed to extend the upstream of the weir and have the shape of a circular arc in plan. Since the cleaning of the sediment in front of the intake structures are more important than the upstream side of the weir, it is usual to use dividing wall in front of the inlet structures to concentrate the flow strength close to this area. The extent of this dividing wall is one of the design parameters affecting the efficiency of the sluiceway. In this paper the experimental investigation on the effects of the dividing wall on the sediment removal by a sluiceway is reported. It is shown that introducing the dividing wall causes the efficiency of sluiceway to clean the area in the vicinity of intake to be improved. However, it is not correct to increase the length of dividing wall more than a certain limit, because in such a case, even the volume of the eroded material is increasing, but it does not reach equilibrium stage quickly. From 4 different cases considered, the length of dividing wall equal to about 27% of the channel width could be selected as the optimum length. It is also concluded that increasing sluice opening results in increase of sediment removal.
Year: 2001