Local scouring around bridge piers is a common phenomenon where during the flood events becomes threaten for their stability. Destruction of bridges in addition to financial damage, during the flood events, causes fatal losses and social problems. A review of laboratory and field studies related to scour around piers reveals that the process of water-pier-sediment interaction to be complex. Thus, providing suitable methods for controlling and reducing local scouring requires extensive research. The two major countermeasure techniques employed for preventing or minimizing local scour at bridge piers can be in 3cm pier width. The results showed that increasing the diameter of the pier leads to a decrease in the efficiency of the cable. With measuring the velocity components around the round nose rectangular pier it was found that the flow separation in the front of the pier happens in the inner region of the scour hole, while at the back of the pier, flow separation occurs in the outer region of the hole. In addition, it is found that in the upstream of the pier, the stream-wise component of velocity becomes positive and the universal log-law is valid. Using the quadrant analysis on the upstream and downstream of the pier, it was found that the occurrence probability of sweep events is more than other events in the scouring phenomenon. Key words: Local Scouring, Bridge Piers, Round Nose Rectangular Pier, Cable
