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题名: Is the wash-off process of road-deposited sediment source limited or transport limited?
作者: Zhao, Hongtao; Chen, Xuefei; Hao, Shaonan; Jiang, Yan; Zhao, Jiang; Zou, Changliang; Xie, Wenxia
刊名: SCIENCE OF THE TOTAL ENVIRONMENT
出版日期: 2016-09-01
卷号: 563, 期号:0, 页码:62-70
关键词: Urban surface runoff ; Build-up and wash-off ; Particle grain size ; Source limited ; Transport limited
DOI: 10.1016/j.scitotenv.2016.04.123
部门归属: 城市与区域生态国家重点实验室
英文摘要: An in-depth understanding of the road-deposited sediments (RDS) wash-off process is essential to estimation of urban surface runoff pollution load and to designing methods to minimize the adverse impacts on the receiving waters. There are two debatable RDS wash-off views: source limited and transport limited. The RDS build-up and wash-off process was characterized to explore what determines the wash-off process to be source limited or transport limited based on twelve RDS sampling activities on an urban road in Beijing. The results showed that two natural rain events (2.0 mm and 23.2 mm) reduced the total RDS mass by 30%-40%, and that finer particles (<105 mu m) contributed 60%-80% of the wash-off load. Both single- and multi-rain events caused the RDS particle grain size to become coarser, while dry days made the RDS particle grain size finer. These findings indicated that the bulk RDS particles wash-off tends to be transport limited, but that finer particles tend to be source limited. To further explore and confirm the results of the field experiment, a total of 40 simulated rain events were designed to observe the RDS wash-off with different particle size fractions. The finer particles have a higher wash-off percentage (F-w) than the coarser particles, and the F-w values provide a good view to characterize the wash-off process. The key conclusions drawn from the combined field and simulated experiments data are: (i) Finer and coarser particle wash-off processes tend to be source limited and transport limited, respectively. (ii) The source and transport limited processes occur during the initial period (the first flush) and later periods, respectively. (iii) The smaller and larger rain events tend to be transport limited and source limited, respectively. Overall, the wash-off process is generally a combination of source and transport limited processes. (c) 2016 Elsevier B.V. All rights reserved.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35613
Appears in Collections:城市与区域生态国家重点实验室_期刊论文

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Recommended Citation:
Zhao, Hongtao,Chen, Xuefei,Hao, Shaonan,et al. Is the wash-off process of road-deposited sediment source limited or transport limited?[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2016,563(0):62-70.
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