Two Dimensional Hydrodynamic And Water Quality Modeling For The North Branch Of Lower Minjiang River

The mathematical model is an important teclmique to evaluate the effectiveness of various contaminant reduction scenarios in the water environment. The North branch of the lower reach of Minjiang River is tidal channel network. And the water environmental problems are serious. The research of hydrodynamic and water quality modeling channel has theoretic and practical significance.Based on the two dimensional shallow water equations including continuity and momentum equations and two dimensional Advection-Dispersion equation, using the method of the finite different and ADI scheme to solve the equations, a two-dimensional hydrodynamic and water quality is developed and applied to the North Branch of the lower reach of Minjiang River. According to the simultaneous observed data, main parameters are calibrated. Applying the 2-D model, the characteristics of flow current and water quality are numerically simulated. The comprehensive simulation and research on the concentration have been conducted with various conditions, including the influence of wastewater discharged from different sewage outfalls which is visualized by the pollution zone, the characteristic of the pollution zone and it is also analyzed that the responses of water quality to the setting of sewage outfalls. Furthermore, the optimization of the setting of multi-sewage outfalls to make use of the self-purification ability of the river is discussed.