By the analyses of main factors affecting storm- induced deposition in the North Passage, Yangtze Estuary, the previous storm- induced deposition formula has been improved, and a new formula has been presented in terms of the intensity and path of typhoon, the evolution tendency of local bedform and the tidal state.

According to the analyses, the North Channel is selution as the main deep-water navigation channel to the sea and is to be pre-trained, and the training principle of the Yangtze Estuary is determined.

The regime of the north channel in the Yangtze Estuary is excellent with a stable discharge ratio and a relatively small sand ratio.

Study of influence on erosion and accumulation of Jiuduansha Tidal Island by Deep-Water Channel Project at North Passage of the Yangtse River;

In combination with the engineering progress, the variation of incoming water & sediment conditions of the north passage, adjustment process of river bed scouring and deposition, as well as reasons of obtaining the new river regime in the north passage are analyzed and studied.

The north passage of Changjiang estuary where the deep waterway was constructed was opened as the channel of Shanghai port about at 1980 .

To counter the phenomenon of local siltation appeared at the section between #255～ #260 light buoys along the downstream north channel during flood period of 1998,anslyses are carried out to the mapping data of different seasons of several years.