The study delves into the dynamics of cross-circulatory flows and their impact on the formation of bar-pool complexes in meandering river beds, a process not yet fully understood. A series of numerical simulations are performed in 70^° sine-generated meandering channel. The flow depth h is varied from 0.8 cm to 17.4 cm, with width-to-depth ratio B/h ranging from 4.6 to 100. Classical cross-circulatory pattern is observed for B/h > 9; however, lower B/h ratios triggers the emergence of outer bank cells due to Taylor-Görtler instability. Under the classical motion pattern, cross-circulatory velocity is vertically separated from the translatory velocity. It is found that the significant near-bed cross-circulatory velocity plays a crucial role in driving radial sediment movements. Using the sediment continuity equation, the bed deformation rate at the initial plan bed are computed. This reveals two distinct patterns of bed deformation, characterized by longitudinal or radially adjacent erosion-deposition zones, that is related to the longitudinal and radial near bed velocities. At significant B/h ratio (> 100), bed deformation is dominated by the convective effect of longitudinal velocity, leading to downstream migration of meander loops. As B/h decreases, the second pattern of bed deformation (due to the cross-circulatory flow) intensifies, occurring in conjunction with the first pattern but remaining less dominant. Lastly, the study discusses the variation in flow and sediment dynamics in flow exhibiting outer bank cells, serving as an extension of the current findings.