Yangtze Delta Plane Two-dimensional Non-uniformity Of The Total Sediment Mathematical Model

Sediment transport in estuarine and coastal is not only one of import problems when the human explore the natural, but also the one of major contents of Land and Sea Interactions in the Coastal Zone. So sediment research is interested for scientist and engineer. Based on the reviews of current research, an 2-D horizontal non-uniform sediment numerical model is established according to the character of hydrodynamic and sediment transport in Yangtze estuary.. The sediment transport process and mechanism is discussed.The Yangtze estuary is so wild, the mouth bars are long, the slope is gentle, so the wave action is importance. The wave effect is considered in hydrodynamic model and sediment model. A 2-D horizontal non-uniform sediment transport is established according to the different grain size in suspended sediment and bed load in Yangtze estuary, which could reflect the conservation during different sediment grain transport and exchange between suspended sediment and bed load. The fine sediment setting velocity due to flocculation is determined by sediment grain, salt, sediment concentration and flow turbulence. A boundary-fitted curvilinear coordinate system has been deployed to obtain a more accurate solution of SSC. The operator-splitting algorithm and the Ultimate Quickest scheme have been used to solve the sediment transport equation. The results calculated are in close agreement with field observation , which shows this model can predict sediment transport in Yangtze estuary. The reason induced SSC variety in tidal channel is discussed through the flux analysis and sediment model.