Abstarct: The displacement of sediment particles due to varying flow pattern change is called scouring. This phenomenon is one of the reasons for the instability of the bridges and, finally, their failure. Therefore, it is important to provide methods to control and reduce scouring. The use of equipment such as sacrificial piers in front of the piers of bridges to provide bridges' stability can be a good solution to this goal. In this research, we first modeled the experimental model with the Flow 3D software and compared and validated it with the results. To do this, we studied and analyzed the depth of the scour hole in the following scenarios which the rate of reduction of scour depth in each state is expressed: 1. In the case of single-pier with sacrificial piers and without sacrificial piers, 54% 2. In the case of two piers with sacrificial piers and without sacrificial piers, on the first pier, 46% and on the second pier, 27%, the cause of the decrease in efficiency can be expressed by the re-formation of the developed current downstream of the first pier. 3. In the case of three piers with sacrificial piers and without sacrificial piers, on the first pier, 48% on the second pier, 28% on the third baxse % 31 ,The cause of the reduction of the effect is the presence of the first pier against the flow, which acts like the bigger sacrificial pier.