【摘要】 以南京市上秦淮片区二横沟小流域为例,在污染源调查的基础上,采用分类法,利用改进后的污染输出系数模型进行流域污染负荷核算,得到外源污染物入河负荷量及各污染源的贡献率。研究结果表明,上秦淮片区二横沟流域内污染物排放负荷总量为COD 229.9 t/a、TN 25.8 t/a、NH₃-N 22.4 t/a、TP 1.7 t/a,入河负荷量为COD 47.1 t/a、TN 5.5 t/a、NH₃-N 4.6 t/a、TP 0.36 t/a,主要来自面源污染,点源污染较小。其中,生活面源污染年入河贡献率最高,为44.5%,林地面源污染贡献率最低,为0.1%,水产面源、道路面源、水田面源和旱地面源贡献率分别为31.6%、16.2%、6.2%和1.4%。更多还原

【Abstract】 The load of external pollutants into the river and the contribution rate of each source of pollution were obtained by classification method and calculating the pollution load in the watershed using improved pollution output coefficient model, based on the investigation of pollution source, taking the Erheng ditch watershed in the upstream Qinhuai River in Nanjing as example. The results showed that the total pollutant discharge load in that watershed was: COD 229.9 t/a, TN 25.8 t/a, NH₃-N 22.4 t/a, TP 1.7 t/a. The load into the river was: COD 47.1 t/a, TN 5.5 t/a, NH₃-N 4.6 t/a, TP 0.36 t/a. Non-point source pollution was the main pollution, while point source pollution was relatively weak. The annual contribution rate of domestic non-point source pollution into the river was the highest of 44.5%, the annual contribution rate of forest non-point source pollution into the river was the lowest of 0.1%. The annual contribution rates of aquaculture non-point source, road non-point source, paddy field non-point source and dry land non-point source into the river were 31.6%, 16.2%, 6.2% and 1.4%, respectively.更多还原