Development and application of a one-dimensional hydrodynamic and water quality model for a flat Tidal River network

Flood disasters frequently occur in the flat river network region of eastern China. The current flood risk management concentrates only on the analysis of water quantity, and lacks in water quality investigations. In this study, the MIKE11 NAM module was used for the simulation of the rainfall-runoff processes, the MIKE11 HD module was used to simulate the hydrodynamic processes, and then the MIKE11 AD module was used to simulate the water quality processes. The coupled model was adequately calibrated using observed data, and then applied to simulate the processes of flood and water quality under four different rainfall conditions. The results indicate that rainfall has a significant influence on flood and water quality in a flat tidal river network, which can provide some assistance for flood and water quality management.