STUDIES ON PERFORMANCE AND SCOUR AROUND SPURS- A REVIEW

Abstract

IN THIS PAPER THE AUTHORS HAVE ATTEMPTED TO CRITICALLY REVIEW THE STUDIES CARRIED OUT ON THE PERFORMANCE OF VARIOUS TYPES AND SHAPES OF SPURS WHICH ARE MADE TO PROTECT THE STREAM BANKS FROM EROSION AND FOR TRAINING OF STREAM FLOW. THE AUTHORS SUGGEST THAT LABORATORY STUDIES IN THE HYDRAULIC FLUME MAKE IT FEASIBLE TO STUDY THE PERFORMANCE OF SPURS IN TERMS OF THEIR STABILITY, SCOUR PATTERN AND SEDIMENT MOVEMENT UNDER CONTROLLED CONDITIONS OF FLOW, BED SLOPE AND BED MATERIAL SIZE. MATHEMATICAL MODELS CAN BE DEVELOPED FROM SUCH INFORMATION. THE LENGTH OF THE SPUR SHOULD BE SUCH THAT IT INTERFERES LEAST WITH THE RIVER REGIME AND A LARGE VALUE OF OPENING RATIO ( GREATER THAN 0.7) IS OBTAINED. AMONG THE FEW STUDIES CONDUCTED ON PERMEABLE SPURS, IT WAS OBSERVED THAT THEY PROTECT STREAM BANK FOR LONGER LENGTH AND CAUSE SMALLER MAGNITUDE OF THE MAXIMUM DEPTH OF SCOUR THAN THE SOLID SPUR