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Information Journal Paper

Title

EXPERIMENTAL STUDY OF SCOURING AROUND A SERIES OF L-HEAD GROYNES

Pages

 Start Page 141 | End Page 162

Abstract

 Groynes are structures constructed at an angle to the flow in order to deflect the flowing water away from critical zones. They serve to maintain a desirable channel for the purpose of flood control, improved navigation and erosion control. One of the most important problems for designers is the estimation of the maximum local scour depth in the vicinity of groynes. Due to contraction of streamlines, the local shear stress increases and the SCOURING around groynes will be developed. Underestimation of the maximum scour depth may lead to collapse. Most of the Previous studies were performed on the straight groynes and little information exists on local SCOURING around L-head groynes. Usually in practical case, the series of groynes (three groynes) are used for protecting the region subjected to SCOURING. In this study, the experiments were carried out with three different types of GRAIN SIZE, four various distances between groynes and three flow discharge in CLEAR WATER condition. The results showed that the maximum depth of scour occurred in vicinity of first groyne and by increasing the GRAIN SIZE, the maximum depth of scour decreased. Also in a specific bed GRAIN SIZE, by increasing the DISTANCE BETWEEN GROYNES, the descending trend of maximum depth of scour was observed especially in greater froude number.

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