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.

Moreover, survey of navigable depth and compilation of navigable depth chart are approached.

Analysis of surveying nautical depth by three wings lead;

Investigation and utilization of the nautical depth of the outernavigation channel of Shantou Harbour;

According to the back silting status quo of Lianyungang Port,the necessity of the application of nautical depth was described.

This paper firstly draws a comparison between two methods for sludge-surveying by the way of analyzing the result of an experiment,and then introduces surveying technique of navigable depth to set forth the keys of exactly measuring thickness of sludge.

For the good use of nautical depth in Lianyungang Port,"Lianyungang Port nautical depth executive procedures" was initially developed.

Through nautical depth’s research and preliminary application,the view of fit mooring depth was proposed.

Study on tidal current and sediment problems of deepwater channel project of Nansha Harbor District of Guangzhou Port;

On the relationship between maintenance condition of Yangtze Estuary deepwater channel and water & sediment transport from the valley

By use of TK-2D software,2-D tidal current mathematical model with irregular triangular grids is set up in the sea area where deepwater channel of Nansha Harbor District of Guangzhou Port lies.