NUMERICAL SIMULATION OF SEDIMENT DISTRIBUTION ON THE ESTUARY WITH SLUICE

摘要

The sluice built on the estuary can be used to control the water level, resist tide and rush off the sand with water and so on.In addition, the sluice can also beautify the circumstance and improve the environment on the estuary. But if the design is improper, it can bring about a series of problems such as sediment filling up under gate, which will decrease river's capability of flooding and draining. If the distribution of the velocity downstream is illogical when the gate is open, the bank downstream would be eroded and its stability would be decreased. This paper takes the sluice on Estuary of Qinhuai River for example, analyses the current's form and sediment erosion and filling up on different condition and gate opening to validate the rationality of the disposal of the sluice hinge.Finally,the reasonable opening of the gate under every flux and water level is given to offer the reference for the sluice'run. In these years, with the high speed and large capability computer's development and the dynamical theory's improvement on estuary, using mathematical model to study the problem about the sediment becomes more and more popular.Delft3D developed by DELFT Hydraulics in Netherlands works effectively on numerical model of flow and sediment's transports. In this example this program is used to simulate velocity's distribution upstream and downstream and the bed morphology after rushing or filling of sediment. Last but not least, the comparison between the results of mathematical model and physic model is carried out to validate its feasibility.