Abstract:The Yellow River delta is the border area of land and sea. The land ocean interaction is significant. The beach evolution, siltation of harbor channel and changes of hydrodynamic environment caused by silt are rather complicated. In this paper, three-dimensional HEM3D numerical model is used to simulate the flow field, salinity, suspended sediment concentration and coastal erosion and siltation in the the Yellow River Delta. It is showed that the concentration distribution of suspended sediment in the the Yellow River delta is closely related to the change of tidal current and the input of the estuarine sediment. In the north of the delta, the sediment of the near shore seabed is obviously suspended and transported to the south by the influence of the strong flow area outside the five pile, and the sediment concentration is about 1.5g/L. In the southern delta (current estuary and Laizhou Bay area), the influence of sediment diffusion on the estuary is remarkable. The distribution of annual erosion and siltation in the sea area, in the northern abandoned delta region, because of strong marine dynamic action and shallow water scouring, the seabed erosion is very obvious, and forms the erosion center along the coast. The erosion is rapidly weakened outside the erosion center. In the current estuarine area, siltation is dominant, and under the control of plume diffusion, the sediment transport to the south and then gradually weaken to Laizhou gulf. The results of numerical simulation are basically the same as those of satellite remote sensing interpretation.
