Investigation and Comparison of Efficiency of Cable and Groove in Protection Against Scouring

Scouring around the bridge pier during the flood events threaten the bridge as important hydraulic structure. Thus, designing the economical device in reducing the local scouring needs to be investigated. Cable has been introduced as new and economical countermeasure in local scouring. In the present study, different diameters and thread angles are studied through the experiments. In addition, groove is introduced in reducing the local scouring. The results show that with increasing cable diameter and decreasing thread angles the reduction of scour depth increases. The maximum scour reduction is achieved for pier protected with cable equal to 13% and 17% in front and behind of the pier respectively. While the groove is reduced scouring equal to 17% and 25% in front and behind of the pier respectively. Comparing the efficiency of cable with groove indicated that groove has higher efficiency in reduction of local scouring.