Geometry of developing and equilibrium scour holes at bridge piers in gravel

Author:

Diab Reda12,Link Oscar12,Zanke Ulrich12

Affiliation:

1. Institute for Hydraulic and Water Resources Engineering, Darmstadt University of Technology, Rundeturmstraße 1, 64283, Germany.

2. Department of Civil Engineering, University of Concepción, Edmundo Larenas 270, Concepción, Chile.

Abstract

Experimental results on scour at circular and square cylinders in uniform gravel under the clear-water scour condition are presented. Nonintrusive, high-resolution topographic measurements of developing and equilibrium scour holes were performed during running experiments with an experimental installation using a laser distance sensor (LDS) and precision step motors. Measurements were taken by the LDS in different azimuthal half-planes with θ = 0°, 15°, 30°, 45°, 60°, 75°, 90°, 105°, 135°, 150°, 165°, and 180° to study the spatio-temporal variation of geometric properties of scour holes. Experiments were conducted over 40 h until equilibrium, with bed shear stress equal to 95% of the critical bed shear stress for the initiation of sediment motion at the undisturbed plane gravel bed having a d50of 3.25 mm. Results show that scour in gravel progresses more slowly around the square cylinder, where steeper slopes than at the circular cylinder are observed. During experiments the scour slopes do not exceed the observed repose angle of the sediment particles. Maximum scour depth in different azimuthal half-planes and scoured volume are well correlated with the maximum scour depth at azimuthal half-plane with θ = 0°.

Publisher

Canadian Science Publishing

Subject

General Environmental Science,Civil and Structural Engineering

Reference26 articles.

1. Simulation of flow around piers

2. Experimental Investigation of Clear-Water Local Scour at Pile Groups

3. A non-touch sensor for local scour measurements

4. Dargahi, B. 1987. Flow field and local scouring around a cylinder. Bulletin No. TRITA-VBI-137, The Royal Institute of Technology, Stockholm, Sweden.

5. TIME-VARIATION OF SCOUR IN THE VICINITY OF CIRCULAR PIERS.

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