Study On Water Quality Of River Section In The Urban Area Of Yichun City Under The Influence Of Artificial Construction

The development of the city is bound to affect environment, all kinds of artificial construction has changed the ecological environment of the original natural river, the construction and operation of water project、the pollutant emission of sewage outlets and other conditions will significantly alter the hydrodynamic conditions and water environment quality of river channel. Along the flow of Yuan River in Yichun City, more and more intensive, pollutant discharge more and more serious, in the middle and lower reaches of the river, drinking water is over standard, the water quality is deteriorated.In order to grasp the changes in water quality and its influencing factors in Yichun City reach, the Flow-quality coupled simulation research in this paper using Hydrodynamics(HD) of MIKE21 model on the basis of the measured water level and flow data, construct Hydrodynamic module of Yuan River in Yichun City to simulate the water level and flow changes in the artificial conditions of the and lift dam;Coupling water quality transmission model of MIKE21 module(Transport Module), simulate translocation and transformation process of main pollutants of the COD and NH3-N in the corresponding conditions in the research river, Determining the quantitative relationship between various working conditions and changes in water quality, Drawing the main influencing factors of river water quality changes in the artificial conditions, Final conclusion: the lift dam increase water environmental capacity and improve the water quality of the research river.Through this study, we draw the corresponding conclusion, for the water intaking、water draining and the measuring and monitoring facilities construction of the sewage outfall into the river and lake provide technical support, for Yichun City river Water Environment Management provide a reliable basis.