给水管网水质模拟研究

目的使用基于水力瞬变模型数值求解水质模型的方法．解决给水管网的水质变化问题．方法通过耦合求解水力瞬变模型和水质模型，用数值模拟管网的水质状况．在计算中适当调整水质时段和水力时段，使模拟结果收敛．结果从余氯衰减模拟结果看，水力瞬变事件通常会加速管网内水质恶化；并且，应用水力瞬变模型也可以模拟稳态下的水质．结论基于水力瞬变模型，应用有限差分法，用数值求解水质模型能够全面准确地反映不同工况下给水管网内的水质变化状况．

Study on Numerical Simulation of Water Quality in Water Distribution Systems

Changes of the water quality in water distribution systems depend on hydraulic conditions of the systems to a great extent.The paper presents the method of numerically calculating the water quality model based on the hydraulic transient model in order to simulate accurately the condition of the water quality in pipe networks.To begin with,the coupled calculation of the hydraulic transient model and the water quality model is a complicated process,so time steps of the two models need a given relation to make the calculation convergent.In the next place,the simulated results of residual chlorine decay demonstrate that hydraulic transient accidents can accelerate the deterioration of the water quality.Moreover,the hydraulic transient model can be applied to the simulation of the water quality in steady condition.Therefore,the water quality model based on the hydraulic transient model can roundly reflect the change of the water quality in water distribution systems in various conditions.