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SHAHSAVARI HAMED, HEIDARPOUR MANOUCHEHR, MOHAMMADALIZADEH MOHAMMAD. 2017. Simultaneous Effect of Collar and Roughness on Reducing and Controlling the Local Scour around Bridge Abutment. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 65(1): 491–499. Investigation of local scour around hydraulic structures particularly bridges is of crucial importance in river engineering. Bridge destruction mostly occurs as a result of scour phenomenon around piers and abutments, not because of structural weaknesses. Hence, finding a solution to reduce scour depth is momentous. In this study which was conducted in the conditions of clear water scour, the effect of local roughness and collar and also impact of using them simultaneously around bridge abutment were evaluated. The results demonstrated that the existence of roughness causes a reduction in the severity of scouring process and its final depth and the use of collar leads to a delay in the scouring process in addition to the ultimate reduction in the scour depth, which in case of using them simultaneously, scour depth decreases by about 83%.