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昆明主城区城市地表径流污染特征分析

Keywords: 城市地表径流,功能区,水质,污染负荷

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Abstract:

昆明市位于滇池上游,城市地表径流污染负荷对滇池水质具有直接影响。通过对昆明主城区内不同功能区12个监测点7次降雨径流过程水样的采集与分析,研究了昆明主城区城市地表径流污染特征。结果表明,昆明主城区城市地表径流中TSS、COD、TN和TP的多场降雨平均浓度分别为182.8、138.2、2.37和0.43mg/L。不同功能区的地表径流水质存在显著差异(p商业区>住宅区>文教区;不同功能区单场降雨径流水质动态变化规律是:污染物浓度在降雨径流初期相对较高,中后期浓度快速下降,并逐渐趋于稳定;地表利用功能、降雨特征和交通流量是影响城市地表径流水质的主要因素;城市地表径流中COD、TN、TP与TSS之间有较好的相关性,说明大部分的污染物质是以颗粒吸附态存在。

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