| 北京奥林匹克公园地表颗粒物粒度特征分析 |
| 摘要点击 2486 全文点击 1636 投稿时间：2014-01-09 修订日期：2014-04-18 |
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| 中文关键词 地表颗粒物 粒度特征 累积 来源 奥林匹克公园 |
| 英文关键词 road sediment particle size characteristics accumulate source Beijing Olympic Park |
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| 中文摘要 |
| 研究了北京市奥林匹克公园2012年10月和11月4次采集的地表颗粒物的粒度特征，结果表明，奥体公园整体以中小粒径76~830 μm的颗粒物为主. 人流量较大的区域颗粒物较粗，而有车辆通过或工地附近的区域颗粒物以粒径<300 μm为主且更易在中等车流量的道路累积. 说明人流量对道路地表颗粒物的组成影响有限，交通流量、建筑施工行为是影响城市公园颗粒物组成的重要因素. 雨前干燥期影响颗粒物组成：随着雨前干燥期（≤15 d）的增加，粒径>300 μm的颗粒物地表累积量不断下降，粒径<150 μm的累积量不断上升，而150~300 μm粒径范围的颗粒物受干燥期的影响不明显. 道路的材质明显影响颗粒物的累积，与石材路面相比，地表颗粒物更容易在公园沥青路面累积，可以通过改进公园道路的设计，如采用石材路面，降低道路的粗糙度，从而减少颗粒物对公园水体的污染. |
| 英文摘要 |
| Particle size analysis of road sediment collected in October and November in Beijing Olympic Park indicates that most of the sediments are 76-830 μm; the grain size of the sediments in the area of large population flow is mainly coarse but the grain size in the area of large traffic volume is fine relatively while most of the sediments are < 300 μm. Moreover, sediments of size range < 300 μm can be easily accumulated on the road with moderate traffic density. The results demonstrate that the effect of pedestrian flow on the composition of the particles is unobvious and the main influences are the traffic density, extensive construction. With the length of dry period increasing, the content of sediments of size range >300 μm decreases and the content of sediments of size range < 150 μm increases, however, the change of the content of sediments of size range 150-300 μm is not obvious. The results indicate that the effectiveness of the road sediment removal depends on the length of dry period, and the accumulation of different size particles varies differently under the different dry days. Compared with the stone road, surface particles can accumulate on the asphalt road more easily as the accumulation of particles is affected by the road material significantly. Therefore, to reduce the urban surface water pollution, it is necessary to improve the design of park road such as using the stone road, which can decrease the roughness of the road. |
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