| 苏州市古城区降雨径流颗粒物粒径分布及污染物赋存形态 |
| 摘要点击 2838 全文点击 1085 投稿时间：2015-08-05 修订日期：2015-09-10 |
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| 中文关键词 城市降雨 径流 粒径分布 影响因素 前期晴天数 污染物形态 迁移转化 |
| 英文关键词 urban stormwater runoff particle-size distribution influencing factor antecedent dry period pollutant forms migration and transformation |
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| 中文摘要 |
| 基于苏州市古城区内商业区、 现代住宅区、 老旧住宅区、 交通区、 园林旅游区等5种具有代表性的功能区降雨径流中颗粒物粒径分析、 水质监测以及降雨径流参数,考察了古城区不同功能区降雨径流中颗粒物分布及其过程变化特征,重点分析了前期晴天数、 降雨强度和径流量对径流中颗粒物分布的影响,并探讨了不同功能区主要污染物的赋存形态以及相关关系. 结果表明,城市不同功能区降雨径流中颗粒物的粒径分布、 迁移过程和输出特征存在较大差异,在针对径流污染控制措施的设计阶段需要区别对待; 前期晴天数、 降雨强度、 径流量与粒径分布有显著的相关关系,是影响颗粒物分布的重要因素; 颗粒物输出在降雨初期受径流冲刷影响较大,径流量与颗粒物迁移能力的相关性在降雨事件初期30%和后期70%径流体积中出现了明显差异; 颗粒态是径流中污染物重要的输出形态,并且通过与不同粒径段颗粒物的相关性分析探明了小于150 μm的颗粒物是吸附、 富集污染物的主要载体. |
| 英文摘要 |
| The particle size distribution (PSD) and its transformation processes in the stormwater runoffs in the ancient town of Suzhou were studied based on the particles size analyses, the water-quality monitoring data and the parameters of the rainfall-runoff models. The commercial districts, the modern residential area, the old residential area, the traffic area and the landscape tourist area were selected as the five functional example areas in the ancient town of Suzhou. The effects of antecedent dry period, the rainfall intensity and the amount of runoffs on the particle size distributions were studied, and the existing forms of the main pollutants in different functional areas and their possible relations were analyzed as well. The results showed that the particle size distribution, the migration processes and the output characteristics in the stormwater runoffs were greatly different in these five functional areas, which indicated different control measures for the pollution of the runoffs should be taken in the design process. The antecedent dry period, the rainfall intensity and the amount of runoffs showed significant correlations with the particle size distribution, showing these were the important factors. The output of the particles was greatly influenced by the flow scouring in the early period of the rainfall, and the correlations between the amount of runoffs and the particle migration ability presented significant difference in 30% (early period) and 70% (later period) of the runoff volume. The major existence form of the output pollutants was particle, and the correlation analyses of different diameter particles showed that the particles smaller than 150 μm were the dominant carrier of the pollutants via adsorption and accumulation processes. |
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