To simulate and predict the strong siltation in the outer channel of Huanghua Harbour,a two-dimensional numerical model,based on the SWAN model,the ADCIRC model and the sediment carrying capacity model under the combined action of waves and currents,is presented,describing the change of waves,currents and sedimentation during strong winds.

Based on the analysis of Tianjin Port silt source, back-silting chacteristics and back-silting degree distribution characteristics in the water area, it is pointed out that to apply navigable depth is an effective measure for guaranteeing vessel safe navigation and port normal production under strong siltation.

A definition of silt-sandy beach has been defined as 0031 mm<d50<0125mm and d40>0031mm, where the characteristics of sediment movement are described as active sediment movement, easy initial movement of sand, coexistence of suspended load and bed load, as well as strong siltation and sudden siltation

On the basis of calulation formula on siltation,deposition thickness and siltation volume in basin and outer channel are obtained.

Based on the experience of dynamic compaction silt displacement method used in the approaching dyke of Nan- hai petrochemical project,this paper presents mainly the parameter choice,comtruction method and result of dynamic compaction silt displacement method.

On the basis of sediment concentration field,the annual back silting intensity on the approach channel of 70 000 DWT at Lianyungang Harbor was also simulated,and the calculated results was coincident with actual data.