基于数学模型的北京龙潭西湖流域合流制溢流污染控制规划研究

Study on Combined system overflow pollution control planning of Beijing Longtan West Lake area based on mathematical model

龙潭湖位于首都功能核心区,主要由东、中、西三个相互连通的湖组成。其中龙潭西湖承接上游地区雨污合流暗沟(历史上称为龙须沟)排水。近年来,在暗沟排放口之前进行截流改造,确保在旱季和小雨时期,污水不直排入湖。然而,在大雨时,暗沟中的合流污水仍会溢流排入湖中,造成湖水环境恶化。以问题为导向,基于排水系统水力和水质模型,模拟分析龙潭西湖流域现状合流溢流污染状况,研究流域内源头控污、雨污分流、截流和调蓄等控制对策;对多个方案进行模拟计算与对比分析,提出近期规划治理方案。

Longtan lake is located in core functional area of the capital city,which is consist of three interconnected lakes,such as east,middle and west lake.Among them,Longtan west lake undertakes rain and sewage of the drainage channel(historically known as Longxu ditch)in the upstream area.In recent years,the interception measure has been carried out before the discharge of the drainage channel to ensure that sewage is not discharged directly into the lake during the dry season and the light rain period.However,during heavy rain,the combined sewage will still overflow into the lake,causing water deteriorate.Guided by the problem,based on the hydraulic and water quality models of the drainage system,CSO pollution status of Longtan west lake area is simulated and analyzed.Control strategy of source,process and end in the watershed are studied.Simulation and analysis of several schemes is carried out,and recent measures are proposed.