Author(s): M. R. Pirestani; M. R. M. Tabatabai; A. A. Salehi Neyshabouri
Linked Author(s): Seyed Ali Akbar Salehi Neyshabouri
Keywords: Lateral intake; Intake location; Diversion angle; Dividing streamline and Flowpattern
Abstract: Diversion flows appear naturally in rivers as braiding or meander cut-offs or alternatively can be developed by man at intakes from rivers or irrigation canals. Intake location and diversion angle as well as flow regime seem to influence dividing streamline in bend channels, this is because diversion flow pattern is three dimensional and non-uniform. The dividing streamline plays a significant role in the rate of diversion flow and sediment transport into the intake channel, while this shows a noticeable variation of flow division from near bed to the surface. Therefore, study of dividing streamline is of importance to hydraulic engineers and researchers being involved in intake design channels. By this means, a rectangular U-shape flume with an intake channel of fixed bed and banks was constructed to carry out experiments for Froude Numbers 0. 27, 0. 41 and 0. 55 for different intake locations and diversion angles. In the main channel, flow pattern was drawn near the bed and the surface in the vicinity of the intake by measuring flow velocity in two dimensions. Then dividing streamline lower and upper boundaries were measured near the bed and the surface, respectively. This is to observe the impact of intake location, diversion angle and flow regime on dividing streamline.
Year: 2005