Study On The Discharge And Lasting Water Safety In The East-route Of South-to-north Water Transfer Project In Lower Of Yantse River

Studying on the tideway of Yangtse Rive backward position and the water environment of Jiangdu City in the water resource area of the east line of south-to-north water transfer project, combined with wastewater treatment project of Jiangdu City, it was wanted to choose two feasible wastewater letting projects of wastewater plants.Based on the water environment characteristics and actual need of Yangtse Rive in the area of Jiangdu City established 2-D riemann approximate solution model and discreted the equation by FVM.FVM follows the conservation law of phsical strictly. It is not only the same with continuous solution but also the same with interrupted solution. The web adopted the quadrilateral meshes of nonstructure, which simulated the boundaries well and the crunodes of web were symmetrical so it can be used to the changes of all kinds of landforms;boundary conditions was easy to give and the boundary format was the same with the inner points format;this way was fast in calculation and saved time. It can change 2-D to 1-D if sovling the problem of 2-D by PVM and improved the efficiency of calculation as same as keeping the precision.The paper simulated the 2-D flow field of the area and the concentration field of different letting projects and validated by actual data. According to the adults of calculations, the effect of different tailwater letting projects to the water environment of Jiangdu City, and optimized a project which was feasible of economy and had little effect to environment, and put out measures of water environmental protection of Jiangdu City. It was valuable to protection the water environment of water resource of south-to-north water transfer project and assure the safety of water quality of it.