Laboratory investigation of flow pattern and scour around bridge abutment in case of using attached submerged vane

Already various studies have been done on the mechanism of scour around hydraulic structure especially bridges. In the field of scour around bridges, researches are more focus on scour of piers in compare with abutment. Also, in the two past decades, submerged vanes have been used to stabilization of bed, protection of Beach Rivers and reduction of scour beach in the bend of rivers and also for prevention of the sediment entry to intake structure and for improvement of the river section near the bridge piers. But so far no study has been done on reduction of scour around bridge abutment by submerged vanes. Therefore in this study, the performance of submerged vane attached to the rectangular abutment was investigated. The results showed that the setup angle had a significant impact on the performance of submerged vanes. Following this research, three-dimensional components of velocity were determined with electromagnetic velocimeter around abutment with attached submerged vane and used for drawing flow pattern and according to it, reasons of effective role of vane was investigated on reductions of bridge abutment scour. Investigation of flow pattern around bridge abutment in case of using submerged vane showed, this structure had the effective role on reduction of scour by creating a low velocity zone around bridge abutment and control of primary vortexes.