浦东开发区河网水动力学模型研究

Study on Water Dynamic Model of Channel Networks in the Pudong New Development Area

文章应用的 Preismann 隐式差分格式,具有计算精度高,稳定性条件限制少,可为后续的河网水质模型提供完整的水力参数等特点。用这一隐式差分格式对圣维南方程组进行数值离散,采用双扫除法(追赶法)可推导出不同边界条件下的各种追赶方程。模型的计算结果与实测值的拟合程度较高。最后,通过计算结果分析了浦东开发区河网流场的基本特点,指出了该地区水环境容量较小的水动力学方面的原因,提出了改善水环境容量的方法。

After comparing with several diffelent schemes oftenused,the author regarded that Preismann implicit schemesis an appropriate one which possessed a good computationaccuracy and less restrict in stability,and could provide acomplete hydraulic parameters for water quality model.Usingdouble sweeping method to solve Saint-veunt equation inPreismann implicit scheme,the author got easily every kindof sweeping equation under every kind of boundary condi-tion.The calculated result could simulate the practice ac-curately.