Abstract
Since suspended sediment and organic matter loads were extremely high in Nhue River (Hanoi, Vietnam), a 2-D depth-average model was constructed to simulate hydrodynamic state, suspended sediment transport and environmental change around the confluence between Nhue River and its tributary, To Lich River. The biochemical conversions were constructed based on the QUAL2E conceptual scheme. The model is capable of backwater simulation that was frequently seen there. The simulation results indicated a strong suspended sediment deposition. A clear deterioration of environment was simulated. Within few hundred meters from the confluence two water masses were incompletely mixed in normal discharge condition.
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