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International Journal of

Recent Trends in Engineering

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International Journal of Recent Trends in Engineering (IJRTE)

ISSN 1797-9617

Volume 1, Number 6, May 2009

Issue on Civil Engineering

Page(s): 59-61

Local Scour Around Hydraulic Structures

Padmini Khwairakpam, Asis Mazumdar

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Scour is a natural phenomenon caused due to the erosive action of flowing stream on alluvial beds which removes the sediment around or near structures located in flowing water. It means the lowering of the riverbed level by water erosions such that there is a tendency to expose the foundations of a structure. It is the result of the erosive action of flowing water, excavating and carrying away material from the bed and banks of streams and from around the piers and abutments of bridges. Scour has been the main cause for failures of marine structures throughout the world. In this paper, an attempt has been made to review few previous studies related to scour.

Many researchers have conducted various studies to predict the maximum depth and diameter of scour hole. Vertical piles have been generally used in flumes to investigate the effects of scour. In a few studies, techniques to reduce the scour depth have been employed by making use of splitter plates and collars on the piles. Helical wires or cables wrapped spirally around the pile to resemble a threaded pile have also been used to reduce the scour. With the use of different special techniques, the scour depth has been reported to reduce by modifying the flow field near the piles. Prediction of scour depth is difficult as there are many uncertainties associated with it. Various methods of protecting the erodible soils around foundations of marine structures have also been adopted and such methods sometimes prove costly. It is therefore felt that more studies are still required to predict the scour depth effectively and also to find cost effective ways to reduce the scour.

Index Terms

Scour, Scour Mechanism, Reduction of Scour, Collars, Splitter plates, Threaded piles

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