Author(s): R. W. Wang; D. Calluaud; G. Pineau; M. Larinier; A. Texier; L. David
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Abstract: This experiment was to study the evolution of unsteady flow in a vertical slot fish pass concerning various configurations of a pool by installing cylinders for improving fishway performance for small fish species. Cylinders are used to modify flow structures in the fishway model with or without a vertical cylinder behind the slot. The studied slope of the flume is 10% and the discharge is 23 L/s. Flow visualization presented the snapshots of the unsteady flow, and particle image velocimetry was used to study the characteristics of flow dynamics. The results show that flow patterns consist of a water jet and one or two recirculation zones depending on the length/width ratio of the pool. The cyclic movement of the bottom recirculations shows a period of approximate 10 seconds for large width and moved towards upstream side of smaller lengths for reduced width. The temporal correlation at the point near the large baffle indicates that the implantation of one cylinder is prolonging the period of cyclic movements of flow. The unsteady flow is composed of high frequency fluctuations as well as very low frequency movements.
Year: 2009