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作为典型的面源污染,路面径流污染具有成分复杂、时空变异性大等特点,其污染特性与排放规律的准确描述是道路生态建设的前提与基础。分析扬州市不同道路6场降雨径流污染特性,结果表明:路面径流污染浓度大,生化需氧量低,可生化性差,TP固相比重最高,COD、Pb、Zn次之,TN最低,各污染物固相比重影响其与SS的线性关系;通过不同场次径流水质对比与同一场次径流前期与后期水质对比,分析了路面径流污染物排放特性,结果表明:不同场次降雨污染物浓度变化规律差异大,同一场次降雨污染物浓度遵循初期高于后期的一般规律;借助分析软件MATLAB,分析了6场降雨排污过程对Metcalf和Eddy冲刷模型的适用性,结果表明:此模型对城市路面径流排污特性拟合效果变异性大,对降雨强度较为均匀且即时输入较弱的降雨较为适用,反之适用性较差。
As a typical non-point source pollution, surface runoff pollution has the characteristics of complex composition and large spatiotemporal variability. Accurate description of its pollution characteristics and emission laws is the precondition and basis of road ecological construction. The results showed that: the pollution of runoff was heavy, the biochemical oxygen demand was low, the biodegradability was poor, the highest proportion of TP solid phase was the highest, followed by COD, Pb and Zn, and the lowest was TN The linear relationship between SSR and SSR was analyzed. By comparing the runoff water quality at different times with the water quality at the early and late runoff of the same runoff, the pollutant emission characteristics of road runoff were analyzed. The results showed that the variation of rainfall pollutant concentration , The same rainy season pollutant concentration follows the general rule that the initial stage is higher than the later stage. With the aid of the analysis software MATLAB, the applicability of six rainfall and pollutant discharge processes to the Metcalf and Eddy scouring models is analyzed. The results show that this model is suitable for urban road surface runoff discharge characteristics The effect of large variability, the rainfall intensity is more uniform and instantaneous input is more applicable to the rain is more applicable, whereas less applicability.