NUMERICAL MODELING OF EROSION / DEPOSITION DUE TO TYPHOON JELAWAT IN THE NORTH PASSAGE OF YANGTZE ESTUARY

摘要

On the average, there are 4-5 storms affecting the Yangtze Estuary every year. The storm-induced extreme waves and set up often make suspended sediment concentration rise. A lot of sediment is carried by currents into navigation channel and deposition occurs in the channel within and after storm, which sometimes affects ship navigating. It is very important for navigation safety to predicate accurately the storm-induced sedimentation in the channel. No.0008 typhoon occurred from Aug.2 to Aug.12 in 2000. The typhoon path is shown as Fig. 1 and the position of going ashore is quite near to the Yangtze estuary. So the typhoon is one of the most severe storms affecting the navigation channel in the Yangtze estuary. The sedimentation amount observed in the channel after the typhoon reached 5.54 *10 m , which resulted in holding up the navigation for several days. This paper attempts to model the hydrodynamics, sediment transport, erosion and deposition caused by the typhoon.