The Effect of Aeration on Scour

by William Rahmeyer, Utah State Univ, Logan, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


A vertical water jet was used to study the effects of entrained air, tailwater depth, size of bed material, jet diameter, and jet velocity on scour. Small amounts of entrained air were found to significantly reduce scour depth and to increase the minimum jet velocity required to initiate motion of the bed material. Scaling scour data by Froude similitude resulted in underestimating both scour depth and incipient motion for an increase in system size. A critical tailwater limit was found for vertical jets in which lower tailwater depths reversed their effect on scour depth. Entrained air was observed to decrease the critical tailwater limit. Plots and equations are presented for scour depth and incipient scour motion.

Subject Headings: Scour | Aeration | Bed materials | Entrainment | Tailwater | Fluid velocity | Fluid flow | River and stream beds

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