Based on the correlative analysis of field data and one-dimensional numerical model for saltwater intrusion,the impact of water diversion from Xinanjiang Reservoir on river course silting and saltwater intrusion at Qiantang Estuary was discussed.

The influences of the projects on channel siltation are compared and analyzed based on the calculation of siltation using Dou Guoren s non-equilibrium suspended-sediment transport equation and riverbed deformation equation,during normal weather and typhoon season.

In recent years, with the increase of the port constructions on the silty coast, the problems of the sediment transport, especially the channel siltation become more and more prominent.

Nearshore sediment transport play a significant role in the coastal evolution and channel siltation.

Analysis and study has been carried out in this paper on several problems such as the river channel sedimentation harnessing scheme,the comparison and selection of gate locations,the structural type and construction method of the tidal gate and the sedimentation releasing and de silting measures applied to gate surround.

Negative influences and causes of canal siltation in the irrigation districts of Yellow River;