The study analyzed how water and sediment move in the Yangtze River estuary during different seasons and tides. They looked at the speed of the water, how much sediment is carried, and the impact of tides. The researchers found that these factors change depending on the season and tide. They also discussed how the movement of water and sediment affects the shape of the river channel. This information will help in understanding how water and sediment flow in estuaries in the future.