Two-dimensional Flow Water Quality Riemann Solution Model And Performance Analysis And Application

The two-dimensional flow-pollutant Riemann approximate solvers model has been analyzed and applied to treat the calculation of the mass and momentum fluxes by Finite volume method based on some recent results on hydro-dynamic model of shallow water. The performance and calculation precision are very important for a model's application. In this paper, the first order scheme and four second order schemes have been applied respectively to analyze the model's performance and results indicate that: all second order schemes show a significant improvement in resolution over the first order scheme, when the Crount number is 1 ,the results of first order scheme are identical to accurate solver just as second order schemes. Contemporarily, comparison between analytic solver and numerical solver shows fairly satisfactory results and practical data is used to ascertain calculation parameter by calibration and validation. The results of application to simulate the flow and concentration field for the Taizhou section of Yangtze River and Wuli lake show reasonable. According to the distribution peculiarity of the two characteristic moments, the accessibility of water quality in Taizhou source of Yangtze River has been analyzed based on the maximal contamination zone of entire tide and the relationship between the length of contamination zone and the pollutant load. Simultaneously, every project has been analyzed and compared by using the model in Wuli lake water environmental renovation for getting some theoretic gist and technical supports for the engineering.