河网水动力及综合水质模型的研究

Study on hydrodynamic and synthetic water quality model for river networks

采用Preissmann 4点隐式差分格式离散一维圣维南方程组,应用三级联解法求解河网水动力数学模型。基于河道-节点-河道算法的河网水质模型的求解特点,在WASP的水质模型理论基础上,建立了河网非稳态水动力综合生态水质数学模型,考虑了多个污染物变量的耦合计算、变量之间的相互转化和迁移。利用模型对4个河网算例进行验证。验证表明,水位和流量过程计算值与实测值吻合很好,各水质变量的计算值和实测值也符合较好,可见模型是合理可靠的,为河网的水质预测和管理提供了一个较为简便实用的工具。

The Preissmann implicit scheme is used to discrete the one-dimensional Saint-Venant equation and the fiver-junction-river method is applied to resolve the hydrodynamic mathematical model for river networks. Based on the characteristics of river-junction-river method and the theory of WASP, the synthetic water quality model is set up for river networks, which includes many contamination variables and considers the transform and transplant of the contamination variables. This model is applied to simulate four fiver networks, the results of elevations and flows agree with the data, the result of contamination variables agree with the measured data. These results show this model is credible and it is a practical tool for forecast and management of water quality in fiver networks.