River confluences can change the shape of the riverbed and how sediment moves. Researchers studied a confluence to see how the flow of water and sediment changed. They found that the confluence caused erosion and deposition of sediment, creating sandbars. Most of the sediment was carried by one of the rivers. They also saw different types of ripples in the water, depending on the wind speed. The study shows that confluences can have a big impact on how rivers look and how sediment moves.