The Yangtze Estuary has been changing over the years, with erosion and deposition happening alternately. This is linked to the amount of water flowing from the Yangtze River and the sediment it carries. During flood periods, more sediment is washed away, causing erosion. In dry periods, sediment builds up, leading to deposition. The construction of dams has affected the estuary's morphology, with decreased sediment flow from the river and more coming from the sea. Despite these changes, deposition is expected to continue in the future, but at a slower rate than before.