人工降雨条件下4种下垫面的冲刷特征比较研究

Comparative Study on Scouring Characteristics of Four Kinds of Underlying Surfaces under Artificial Rainfall

为研究不同下垫面上的雨水径流污染冲刷规律,文章以人工降雨作为辅助条件,选取水泥、沥青、广场砖和屋顶4种典型不透水下垫面为研究对象,研究持续降雨冲刷过程中各类下垫面上COD和NH3-N的浓度变化,最后利用SWMM模型中的冲刷函数来评估不同下垫面地表污染物冲刷特征。研究结果表明:4类下垫面中,水泥地表的COD和NH3-N冲刷系数最大,沥青的COD冲刷系数最小,屋顶的NH3-N冲刷系数最小。

In order to study scouring characteristics of rainfall runoff pollution on different underlying surfaces, the paper studies the change of COD and NH3-N concentrations on the underlying surface of cement, asphalt, square brick and roof during the rainfall. The SWMM model was used to evaluate the characteristics of runoff pollution. The results show that： the scouring coefficient of COD and NH3-N of the cement surface is the largest among the four kinds of the underlying surfaces, the scouring coefficient of COD of the asphalt is the smallest, and the scouring coefficient of NH3-N of the roof is the smallest.