基于组合模型的调蓄池改善城镇河道水质的应用

Application of Storage Tanks to Improve Urban River Water Quality Based on Combined Model

针对降雨径流导致城市内河污染问题,以界首市界毫河为例,利用MIKE11水动力水质模型,结合SWMM降雨径流污染模型,模拟分析了设立雨水调蓄池对河道水质改善的效应,得出调蓄池最佳建造方案。结果表明,SWMM模型和MIKE11模型组合使用,可以很好地模拟降雨径流对河道水质的影响情况;在研究区域排水管网末端建造雨水调蓄池对水质的改善效果明显优于在排水管网中部建造雨水调蓄池对水质的改善效果;在重现期P=1降雨条件下,排水管网末端建造容积10000m^(3)的雨水调蓄池时,能使河道断面COD和NH_(3)-N平均浓度分别下降36.5%、44.7%,这为城镇河道污染治理工程决策提供了参考。

In order to solve the pollution of urban river caused by rainfall-runoff,the Jiehao River in Jieshou City was taken as the research object.The MIKE11 model and SWMM model were combined to simulate the effect of setting up rainwater storage tanks on the improvement of water quality,so as to determine the best construction scheme of rainwater storage tank.The results show that the combination of the SWMM model and the MIKE11 model can effectively simulate the impact of change of rainfall on the river water quality;Building a rainwater storage tank at the end of the drainage network in the area can better improve water quality than building it in the middle of the drainage network;Under the condition of rainfall in the recurrence period P=1,when a rainwater storage tank with a volume of 10,000 m^(3) is built at the end of the drainage network,the average concentration of COD and NH_(3)-N in the river section can be reduced by 36.5%and 44.7%,which provides a reference for the decision-making of urban river pollution control projects.