环状河网水质模型在水污染控制规划中的应用

结合一维圣维南方程及CSTR水质概念模型的机理,开发了平原环状河网非稳态水质模型,并用于温州市温瑞塘河水污染控制规划的编制中。模型由水文子模型和水质子模型两部分构成,描述了水体中COD、氨氮和DO浓度随时间、空间的动态变化。利用新开发的模型,采用试错法,估算了河网的水环境容量,并以此为基础确定了远、近期污染物排放控制目标;通过研究水质恢复的滞后性,提出可以采取引水冲污、人工曝气复氧等非常规措施来改善河网水质;并且利用情景分析方法,分别设定不同流量与不同开闸方式相组合的9种冲污情景,定量化探讨了引水冲污方案;根据曝气复氧对河网水质改善的作用特征,筛选出需要曝气复氧的重点河段和次重点河段。

Application of unsteady water quality model for looping river network to water pollution control planning

An unsteady water quality model for looping river network is developed for water pollution control planning of the Wenruitang River basin in Wenzhou City. It is based on the Saint Venant equations and the conceptual model(the contunuously stirred tank reactor, CSTR). The model is made up of the hydrological sub-model and the water quality sub-model.It can show the dynamic changes of COD, ammonia-nitrogen and DO in the river network. With the model, water environmental capacity of Lucheng river network is estimated. The short-term and long-term pollution control objectives are also worked out. After the study on characteristics of water quality restoration, it can be concluded that the irregular measures such as polluted watercourse flushing and aeration could be taken. Furthermore, nine scenarios on polluted watercourse flushing are analyzed quantitatively, and river reaches required aeration are screened out, too.