Abstract:

In the light of the current water environment of Donghu Lake and the historical hydraulic connection between the Yangtze River and the Donghu Lake,a scheme of water diversion from the Yangtze River to Donghu Lake is proposed to remedy the water quality of the lake.A coupled onedimensional river and twodimensional lake hydrodynamic and water quality model is developed in this paper.The principle model coupling is that water level,discharge and water quality simulated by the onedimensional river model and twodimensional lake model are equal respectively at the junction section.The parameters of the model are calibrated and validated with water quality and hydrology data of field measurement.Then,the model is applied to simulate the influence of water diversion on the water quality of Donghu Lake.The simulation results show that the water diversion will decrease the concentration of CODMn and TN obviously,but will not significantly decrease the concentration of TP of the water body.The simulation also shows that some bay region could not be affected by the water diversion and the water quality could not be improved.Water diversion can be a practical method for water quality remediation of Donghu Lake.The proposed model could be a effective tool for water environment management in other lake regions