Abstract
Local clear-water and live-bed scour tests were performed for a range of water depths and flow velocities with two different uniform cohesionless sediment diameters (0.27 and 0.84 mm ) and a circular pile with a diameter of 0.15 m . The tests were performed in a tilting flume ( 1.5 m wide, 1.2 m deep, and 45 m long) located in the Hydraulics Laboratory at the University of Auckland in Auckland, New Zealand. These tests extend local scour data obtained in controlled experiments to velocity ratio (V∕ Vc ) values as high as 6. This is near the velocity where the peak live-bed scour occurs for the sediment and flow conditions. Scour depth predictions are made with four different local scour equations for the conditions of the tests and the results compared with the measured values.
Highlights
This paper presents the results of 24 local sediment scour experiments conducted by the lead author in the Hydraulics Laboratory at the University of Auckland in Auckland, New Zealand
The experiments in this study have extended the live-bed local scour depth data set
Commonly used, local scour prediction equations were evaluated for the conditions of the experiments
Summary
This paper presents the results of 24 local sediment scour experiments conducted by the lead author in the Hydraulics Laboratory at the University of Auckland in Auckland, New Zealand. The tests were performed with a single circular pile located in two different, uniform diameter cohesionless sediments, with a range of water depths and flow velocities. All but four of the tests were conducted in the live-bed scour range. The scour depth results and sample time history plots of the scour depth are presented in this paper. Equilibrium scour depth predictions using Sheppard’s and three additional commonly used equations are made and compared to the measured data. The four equations are used to predict equilibrium scour depths for several hypothetical prototype scale situations and the results compared
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