The quantitative analysis for Changjiang Estuary deepwater channel regulation project effects based on digital elevation model

The Changjiang Estuary deep-waterway project was started in 1998, and in 2002 and 2005, the first and second phase projects have been completed one after another, the water depth of navigation reached 8.5 and 10.0 m respectively. Since the third phase project in 2006, the middle segments of the North Passage have been silted for successive four years and the average annual dredging maintenance volume has reached 60×10⁶ m³, which has affected the target of the third phase project. Using a special self-developed digital elevation model platform for quantitative analysis and establishing a time series and spatial attribute database, the rule of riverbed erosion and deposition variation and project results were analyzed quantitatively. The analysis results reveal silted sediment sources, silted process, key siltation causes and silted positions for the North Passage deep waterway of Changjiang Estuary South Channel, which provide the scientific basis for the engineering decision-making.