Law governing back silting in Lingdingyang reach of the seaward deepwater channel of Guangzhou Harbor

Based on field observation data,the temporal and spacial variations of the deposition and erosion in the seaward channel of Guangzhou Harbor are analyzed,and the reasons for the back silting in the channel are presented in the paper.Prediction of the amount of siltation in the seaward deepwater channel for various excavated projects is performed by using the mathematic model.Results show that siltation intensity in the navigation channel increases with the increase of the excavation depth.The amount of siltation is relative to not only the siltation intensity but also the excavation depth and width,which ranges from 2.74×106 to 6.9×106 m3 annually for various projects.