Numerical simulations on transportation and deposition of SPM introduced from the Yellow River to the Bohai Sea
黄河入海泥沙输运及沉积过程的数值模拟

A 3D diagnostic model including a suspended sediment transport module,ECOMSED, driven by the monthly discharge and sediment load of the Yellow River, wasapplied to the Bohai Sea during 1983-1984. The simulations on temporal-spatial variety ofSPM (Suspended Particular Matter) concentration, sediment flux, and deposition rate werecarried out. It could be discerned that, the SPM concentration presented distinctly seasonalvariety, and the variability characteristic was similar in two years. Some of the fine sedimentof the Yellow River extended to the western bank of the Liaodong Bay, but most of thesediment deposited around the estuary of the Yellow River, and the deposition fluxprogressively decreased with the distance to the estuary increasing. The deposition kept at arate of 0.05-0.1 mm/a, which is close to the in situ data. There were two areas of high SPMconcentration in the Bohai Sea, one of which can be attributed to the Yellow River discharge,and another one located at the seas with intensive resuspension power may be due to the tidalcurrent energy. The sediment poured from the Yellow River was transported mainly along thetrack of the Lagrange residual circulations. In one word, the suspended load transport wasbasically attributed to the wind-driven and tidal-forcing Lagrange residual circulations. Theresuspension flux was related to the bottom currents: the larger the current speed, the morethe sediment resuspended.