Vertical 2-d mathematical model of sediment silting in dredged channel

摘要

Channel excavation is an important project measure in channel dredging, which is widely applied in channel regulations. Since channel excavation changes the original channel's bed morphology, the pattern of flow becomes more complicated and the relative balance between water flow and sediment is broken. The paper constructed a vertical 2-D numerical model of excavated channel focusing on the sediment deposition and flow distribution, which takes the hydrodynamic pressure into account and adopts auto-mesh technique. The model can effectively reduce the error caused by calculating meshes not completely matching with the calculating region. By introducing the hydrodynamic pressure, the mode can overcome the difficulty in modeling the severely changing velocity caused by the channel excavation. To verify the reliability of the model, Alfrin's experimental datum is adopted in the paper, and the calculating results agree well with the experimental datum.