城市降雨径流污染负荷模拟研究

Simulation Study on Pollution Load of Rainfall Runoff in Urban Area

城市降雨污染负荷模拟能够为城市水环境综合治理提供决策依据。以海南省海口市大同沟汇水区为研究对象,构建城市地表径流污染物负荷模拟模型,并利用现场监测数据进行参数率定,模拟分析典型降雨过程中的化学需氧量(Chemical Oxygen Demand,COD)、五日生化需氧量(5-Biochemical Oxygen Demand,BOD5)负荷量及负荷累计过程。结果表明,两种污染物负荷累计量在0~20 min迅速增长,随后趋于稳定;小区道路/社区下垫面类型的各污染物负荷贡献量均最大,占整个区域污染量负荷的98%以上。

Carrying out simulation of urban rainfall pollution load can provide decision-making basis for the comprehensive treatment of urban water environment.Taking the catchment area of Datong ditch in Haikou city,Hainan province as the study object,a simulation model of pollutant load in urban surface runoff is established and the model parameters are calibrated using on-site monitoring data.The Chemical Oxygen Demand(COD)and 5-Biochemical Oxygen Demand(BOD5)pollutant loads and cumulative processes is simulated based on the model during a typical rainfall process.The results show that the cumulative load of pollutants increases rapidly from 0 to 20 min and then stabilizes;The contribution of pollutant load from the types of residential roads/communities underlying surface type is the largest,accounting for more than 98%of the total pollutant load in the entire area.