3D numerical simulation of sediment in the Hangzhou Bay based on FVCOM

The region across the Hangzhou Bay is one of the most economically developed areas in China.There are lots of projects constructed in the Hangzhou Bay,which change the transport of current and sediment in the water area.The sediment transport in the Hangzhou Bay,a huge tidal estuary,is very complicated due to the effects of river runoff,wave and tide.The cohesive sediment is reciprocating its motion under the force of tide flow which comes dominantly from the Yangze River.Although 2D model has succeeded in simulating tide and sediment transport in huge tidal estuaries,it can only provide the depth-averaged data in plane.With the hydraulic and coastal engineering construction,more precise research products are needed.In this paper,a 3D current and sediment model is established through FVCOM.The measured data of the current and sediment in the Hangzhou Bay are collected to test the model,and the simulating process is generally consistent with real data.The sediment transport with tide current during spring tide period is simulated,then planar and vertical sediment distribution are obtained in the study.Although the precision is not as good as the planar 2D model,it is an important attempt to model 3D sediment transport in a huge tidal estuary.The model can be applied to analyze the engineering 3D effect on the territorial waters through ongoing improvement.There are broad application prospects in exploitation and protection of water ecology.