摘要：An experimental study on the control of scour at vertical circular piles under a steady current is presented. One of the methods of scour control around the piles bridge is to use the cable and collar around it. In this study, experiments were carried out in a rectangular plexiglass flume to study the effect of cable and collar around a vertical circular piles. In this research, a series of experiments was performed by placing a vertical circular piles and in two modes of with cable and collar and without collar. The experiments were carried out for different cable-pile diameter ratio, threaded piles and thread angles under steady current and clear water. The results show that the simultaneous use of cable and collar has high efficiency in reducing the scour depth. The best configuration was found for a cable-pier diameter ratio of 0.1, triple threaded and thread angle of 15°, in which the scour depth in upstream of the pier reduced to about 63%. In the case of a pier protected with cable and collar the scouring postponed more than pier protected with collar and the rate of scouring is less than in pier protected with collar. The results indicate that the scour reduction increases as the cable diameter increased.
