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采用人工降雨装置,对不同降雨强度下城市回填土草地径流系统中水量和污染物的分配特征进行了实验研究.结果表明,降雨强度对径流水体及污染物变化有较大的影响.当降雨强度为16和30 mm·h~(-1)时,小区只有地表径流产生.当降雨强度为71和87 mm·h~(-1)时,小区会有壤中流产生,并且壤中流占比会随降雨强度的增加呈现先上升后下降的变化趋势,而地表径流一直占主导地位.另一方面,小区地表径流中的TSS、TN和TP浓度都随着降雨强度的增大而增加.本研究对污染物质迁移与分配的影响机制和城市面源污染的治理及相应处理措施的选择具有重要意义,并且对于地下水保护具有现实意义.
An artificial rainfall device was used to study the distribution of water and pollutants in runoff systems of urban backfill grasslands under different rainfall intensities.The results show that rainfall intensity has a significant impact on runoff water bodies and pollutants.When rainfall intensity At 16 and 30 mm · h ~ (-1), only surface runoff occurred in the plot, and when the rainfall intensity was 71 and 87 mm · h ~ (-1) With the increase of rainfall intensity, the trend of rising, then falling is the first, and surface runoff always dominated.On the other hand, the concentrations of TSS, TN and TP in the surface runoff increased with the increase of rainfall intensity.This study The mechanism of the impact on the transfer and distribution of pollutants, the treatment of urban non-point source pollution and the selection of corresponding treatment measures are of great significance and have practical significance for groundwater protection.