Numerical Simulations Of Three Dimensional Suspended Sediment Transport With The Effect Of Storm

The estuary and coastal areas with rich resources and convenient traffic are greatly related with human's economy, life and so on, and it's the main place people live, product, trade and travel. Otherwise, the estuary and coastal areas locate in connection region of land and sea where the dynamic conditions are changeable, so that the effect people make use of these areas depends on the thorough knowledge of various marine dynamic elements and the material movement rules under these dynamic conditions'control. Among these movements one of great importance is sediment movement which causes phenomena as evolvement of beach, silting of harbor and sea-route. Whereas the storm is considered the important factor that affects the sediment movement and shapes the landform of seacoast and seabed, the storm wave together with storm tide and astronomy tide can easily cause the corrosion of beach, agitate bottom sediment, fiercely change the landform of seacoast and seabed in disaster area, and even affect the security of coastal engineering and shipping.In this dissertation, a 3D suspended sediment model called COHERENS-SED was first used in offshore area of Jiaonan to set up the sediment movement model under the condition of common wave and simple tidal current. On the base of comparing and checking up the results of simulation with the in-situ data, the 3D suspended sediment model was combined with the storm hydrodynamic model to simulate the sediment movement in the No.9711 tropics storm, then the result was compared with the area's hydrodynamic and sediment movement under the condition of common wave and simple tidal current, which farther analyzed the partial mechanism that storm influences the sediment movement in shore.The results indicate that COHERENS-SED is applicable in the 3D simulation of Jiaonan offshore area's current field and sediment. Through the compare and analysis, it is known that the storm has enhanced the bottom stress, changed the current field, and has strongly influenced the sediment's increasing and beach landform's change.