SEDIMENT TRANSPORT OF SEA-ENTERING WATERWAY IN THE CHANGJIANG ESTUARY

摘要

As is known to all, the mouth bars reach is a key section to the deep waterway improvement in the Changjiang Estuary with sediment erosion and deposition. Evolution of the mouth is very complicated i as it is located at the mixing area and affected by many factors such as interaction of runoff and tidal current, mixing of the salty and fresh water and sediment resuspension action by wave and current. On the basis of the evolution laws of the river channels in the Changjiang Estuary summarized, this paper centers on characteristics of bed-load transportation, mechanism of suspended sediment deposition and resuspension and effect of sediment exchange between flat and channel on the waterway silting in the sea-entering from the South Channel to North Passage in the Changjiang Estuary, by using satellite remote sensing information and regional corrective analyzing of sediment composition. From this, the paper further expounds the theoretical basis of decision-making plan for the deep waterway improvement in the Changjiang Estuary.