Numerical Simulation of Water Quality in Tidal Reach of Xiaoqing River Based on MIKE21
In order to improve the water quality and the ability to prevent the risk of water environment pollution in the tidal reach of Xiaoqing River,numerical simulation of water quality was carried out in tidal reach of Xiaoqing River.The MIKE21 was used to build a hydrodynamic-water quality coupling model.The main exceeding pollutants COD,TN and TP were selected,and the model was calibrated and verified by the measured water quality data.The water quality changes of the tidal reach under three scenarios of different upstream water quality,differ-ent pollution reduction conditions and sudden water pollution in different water periods were simulated.The results show that the calibrated and validated hydrodynamic-water quality coupling model is well suitable for the tidal reach of Xiaoqing River.When the upstream water is class Ⅳ,COD and TP are basically achieved,and TN exceeds the standard.When the upstream water is classⅤ,none of the indicators are up to standard.The upstream water quality should be controlled within the range of classⅣas much as possible,and the TN pollution control of the basin water body should be strengthened.Reducing 30%of point and non-point source pollution can effectively reduce COD and TP pollution,but the improvement effect on TN is not good.The influence of polluted water on water body lastes longer and the concentration is higher in the migration process of normal periods.In the wet period,the migration speed will be faster and the emergency treatment time will be less.
tidal reachMIKE21 modelwater qualityhydrodynamic-water quality coupling modelXiaoqing River
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