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Abstract-
The paper presents the results and analysis of laboratory studies on understanding the mechanism of flow modification and scouring around an abutment with the help of flow visualization techniques. These techniques have been selectively used for comprehensive study of the entire flow region around an abutment. These techniques have been categorized to understand the flow modification in three different domains that include Surface flow region, the intermediate layers and the area near the sediment-structure interaction junction. The techniques include Wet Paint Technique, Reflective Powder Technique and Dye Injection Technique. Different flow fields have been observed and photographed and a comprehensive flow modification around abutment models has been presented.