The article discusses how sediment transport in the Changjiang River has changed over the past few decades, especially since the Three Gorges Dam started operating in 2003. The researchers found that there has been a decrease in sediment discharge, leading to changes in sediment concentrations and grain sizes in the estuary. They also discovered in situ flocculation of suspended sediment in the river and estuary, affecting sediment transport. The study shows that engineering projects like the dam have significantly impacted the regional hydrodynamics, highlighting the interconnectedness of the river, estuary, and sea through water and sediment movements.