Distribution Characteristics of Channel and Shoal Sediment and Its Affecting Factors After the First Phase of the Changjiang River Estuary North Channel Project

Based on the analysis results of sediment collected from the Changjiang River estuary north channel in 2000 and 2001, the shoal-channel sediment exchanges and sediment distributions after the first phase of the Changjiang River estuary deep water channel project are discussed in detail. The implementation of the deep water channel project has affected the water and sediment conditions of the north channel and its side shoals and the sediment distributions. The strong runoff, tidal current and wind wave actions cause the scour and siltation conversion and changes in sediment distribution of north channel and its side shoals; the implementation of the channel project makes the sediment grain size in the project section channel coarser and the sediment grain size in the side shoal area and the downstream of project section finer, which refects the changes in shoal-channel sediment exchange after the implementation of the channel project.