摘要
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.
Artificial rainfall experiment was performed and results indicate that rainfall intensity has a significant effect on water and pollutants distribution. Specifically, when the 16 or 30 mm·h-1 of rainfall intensity only produces surface runoff, and 71 or 87 mm·h-1 of rainfall intensity produces both surface runoff and intertlow. Furthermore, the proportion of interflow will first increase and then decrease with the increasing rainfall intensity, while the surface runoff keeps dominant. On the other hand, the concentrations of TSS, TN and TP in surface runoff and interflow increased with the increase of rainfall intensity. This study is important to demonstrate the mechanism of the migration and distribution of pollutants, the control over urban non-point source pollution, and the selection of the corresponding treatmentsfor practical groundwater protection.
出处
《环境科学学报》
CAS
CSCD
北大核心
2017年第9期3449-3455,共7页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.41401546)
江苏高校品牌专业建设工程资助项目(No.PPZY2015C222)~~
关键词
城市回填土
模拟降雨
降雨强度
草地
分配
urban backfill soil
simulated rainfall
rainfall intensity
grassland
water distribution