A 3D MATHEMATIC MODEL FOR MULTI-COMPONENTS SEDIMENTS AND ITS APPLICATION IN JIAOZHOU BAY

Based on the hydrodynamic and sediment transport module of the Environmental Fluid Dynamics Code (EFDC), we developed a 3D mathematic model for calibration and verification of hydrodynamic process, sediment resuspension and transportation of the multi-components sediments of the Jiaozhou Bay. In the model, bottom sediments were divided into one cohesive and four noncohesive classes. The results indicate that the concentration of tidal-driven suspended sediment was relatively low and thus cohesive sediments (<0.063mm) predominated in the water body of JZB. The suspended cohesive sediments move mainly with tide in a reciprocating way of long distance within the bay. However, most of the suspended noncohesive sediments (0.063~0.25mm) fell rapidly and accumulated at the sea bottom off the bay. In general, the changes in the sedimentation pattern of the entire JZB were not significant. The inner Bay has mainly been erosional with a relatively small rate of sedimentation while the outer Bay remained in deposition. But, the sedimentation pattern is relatively complex in the outside of JZB.