Anomalous Contraction Scour? Vertical-Contraction Case

by E. M. Hahn, Engineer; RJH Consultants, Inc., Englewood, CO 80112.,
D. A. Lyn, (corresponding author), (A.M.ASCE), Professor; School of Civil Engineering, Purdue Univ., W. Lafayette, IN 47907,

Serial Information: Issue 2, Pg. 137-141

Document Type: Journal Paper

Abstract: Clear-water scour due to a short vertical (pressure flow) contraction was investigated in a laboratory channel. Two approach velocities were studied for a (nominally) single configuration of depth and degree of contraction, with experiments conducted for various durations up to a maximum of 48 h, and the evolution of the scour hole over time monitored. The location of maximum scour in both cases was observed to occur downstream of the contraction, with maximum scour depths substantially in excess of values predicted by published models, even though equilibrium scour conditions were not reached.

Subject Headings: Scour | Hydraulic contraction | Equilibrium | Fluid velocity | Channel flow | Rivers and streams | Pressurized flow |

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