What occurs at the point bar of a meandering stream?

In a meandering stream, the point bar is an area that forms on the inside bend of the stream where the flow velocity decreases. As the water slows down, it loses the energy needed to carry sediment, leading to the deposition of fine materials. The characteristic shape of the point bar is essential to understanding sediment dynamics in meandering streams.

The correct choice highlights that fine sediments accumulate here as the water's velocity diminishes. As a result, sediment deposition occurs, creating a buildup of these materials over time. This phenomenon is significant in shaping the river's morphology as it promotes the gradual construction of point bars while the outer bank, or cut bank, experiences erosion due to the higher velocity of water in that area.

The choice noting that debris from cut banks moves downstream to coarser material deposits does not accurately represent the sedimentary processes occurring at point bars. Instead, the focus should be on how the changing flow dynamics create an environment conducive to sedimentation, particularly of finer sands and silts on the point bar, rather than debris movement from eroded banks.