Plunge-Pool Scour by Inclined Jets

by Assem M. Afify, Hydraulics and Sediment Research, Inst, Cairo, Egypt,
Gilberto E. Urroz, (A.M.ASCE), Hydraulics and Sediment Research, Inst, Cairo, Egypt,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


A series of experiments were performed in a sand-bed plunge pool with circular jets produced by nozzles at different angles and elevations and conveying different flow discharges. The effects of air entrainment, jet inclination angle, jet velocity, and tailwater depth on the depth of scour were analyzed. It was found that air entrainment tends to reduce the amount of scour due to increased dissipation of jet energy by the formation of air bubbles in the plunge pool. Dimensional analysis was used to obtain a relationship between the scour depth and related flow variables.

Subject Headings: Scour | Hydraulic structures | Fluid velocity | Fluid flow | Entrainment | Hydraulic models | Fluid mechanics

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