Turbulent Transverse Shear Flows in Shallow Waters

by Vincent H. Chu, McGill Univ, Montreal, Quebec, Canada,
Sofia Babarutsi, McGill Univ, Montreal, Quebec, Canada,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


Shallow turbulent mixing layers, generated downstream of a splitter plate between a fast and a slow open-channel flows of shallow water depth, were investigated experimentally for vertical confinement and bed-friction effects. Mean and r. m. s. velocity profiles across the mixing layers were obtained at a number of cross sections downstream of the splitter plate, using a hot-film anemometer in conjunction with a PDP11/03 instrumentation computer. The initial spreading of the shallow mixing layers was found to be twice as large as the nominal rate for the free mixing layer. The spreading rate diminished to zero in the far field region as a bed friction number approached a critical value of 0. 09.

Subject Headings: Turbulent flow | Shear flow | Transverse shear | Water flow | Shallow water | Rivers and streams | Plates | Confined flow

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