Scour Around Skewed Spur Dikes

Abdel-Monim, Yehia ; S. A. Ead, Y. K. Abdel-monim, R. M. Soliman 


Using a spur dike is one of the most efficient methods of controlling river bank erosion. One of the important problems in a spur dike’s design is the local scour around its nose. Acceleration of the flow and the formation of strong vortices around the head of the spur dike are responsible for local scour in its vicinity. This laboratory study examined the effect of time, the Froude number, and the orientation (i.e. the angle of skewness) of the spur dike on the dimensions of the scour hole that forms around its nose. Scour-hole dimensions measured included the maximum scour depth, the maximum length of the scour hole, and the scoured volume. The study focused on the effect of the angle of skewness of the spur dike on the scour-hole dimensions. Seventy five experiments were conducted. Five angles of skewness (30, 60, 90, 120, and 150 degrees) of the spur dike were tested. Scour holes were surveyed after 5, 20, 40, 60 and 90 minutes from the start of the flow. For every skewed spur dike three discharges were used. In all models, the length of the spur dike was adjusted such that, given its skewness angle, its projection perpendicular to the flume wall was 50% of the flume width. It was found that the relative maximum depth of scour increased with the increase of the angle of skewness until it reached 90 degrees then decreased. The relative length and volume of the scour hole were found to increase with the increase of the angle of skewness.

Other data

Issue Date Aug-2007
Journal Canadian Society for Civil Engineers 
Conference 18th Canadian Hydrotechnical Conference 
ISBN 9781894662154

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