Submerged vanes mitigate sediment control challenges in alluvial channels by altering flow patterns and redistributing bottom shear stresses, with rectangular plates being a common choice based on their dimensions and shapes. Local scour around vanes, is a significant design consideration, involving horseshoe vortices and complex sediment transport. The present study analyzes a particular arrangement of three such vanes, having identical dimensions in a laboratory channel with the sand bed to understand sediment transport and channel navigability. In order to comprehend the underlying physics, an experiment was carried out to observe flow patterns and traits within local scour holes during a state of clear water equilibrium scour. Three vanes were positioned at a 15° angle with respect to flow at 10.5 cm water depth and 25 lps discharge. An acoustic velocimeter was used to determine the different profiles of velocities and associated contours of longitudinal, transversal, vertical, and absolute velocities at different fixed horizontal planes as well as vertical planes for the arrangement of three vanes. The findings indicate that downstream vane positioning increases the downward velocity component upstream of two vanes due to obstruction effects, with higher transverse velocity near adjacent vane locations. Longitudinal velocity remains largely undisturbed by the vanes. Stronger horseshoe and wake vortices are observed at the two downstream vanes.