Removal of road deposited sediments by sweeping and its contribution to highway runoff quality in Korea
Removal of road deposited sediments by sweeping and its contribution to highway runoff quality in Korea
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DOI：
10.1080/09593330.2014.911777
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发表时间：
2014-04
影响因子：
2.8
通讯作者：
Dogun Kim;Kwon Jeong;S. Ko
中科院分区：
文献类型：
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作者：
Dogun Kim;Kwon Jeong;S. Ko
众所周知，公路径流是一种重要的非点源，增加了接受水中的污染物负荷。为了减少径流中的NPS污染物，清扫清除道路沉积泥沙被认为是有效的。然而，到目前为止，清扫对改善径流质量的贡献还没有得到明确和定量的论证。为了探讨清扫对改善公路径流质量的效果，本研究在韩国某运营公路路段进行了现场试验。结果表明，清扫对RDS载荷的平均降幅为61.10%，标准偏差为1.74%。当扫速从4~8kmh−1增加到20kmh−1时，反硝化效率下降，负荷从12 5g m−2降到1.2 5g m−2，颗粒尺寸从砂粒减小到粉粒/粘土粒级。通过对扫掠和非扫掠路段施加15 mm h−1人工降雨来诱导径流。径流水质分析表明，清扫后总悬浮物、生物需氧量、化学需氧量、营养盐和大部分重金属的事件平均浓度下降了31~87%。此外，实地测试显示，铁路发展计划每四至五天进行一次扫荡，以防止铁路发展计划再次暂停运作。研究结果表明，清扫是有效减少公路RDS、提高公路径流质量的最佳管理措施。
Highway runoff is known to be an important non-point source (NPS), increasing the load of pollutants in receiving water. For reducing NPS pollutants in runoff, removal of road deposited sediment (RDS) by sweeping is considered effective. However, the contribution of sweeping to the improvement of runoff quality has not been clearly and quantitatively demonstrated so far. In this study, a field test was carried out on a section of operating highway in Korea to investigate the effectiveness of sweeping on improving the quality of highway runoff. Results showed that the average reduction in the load of RDS by sweeping was 61.10% with a standard deviation of 1.74%. RDS removal efficiency decreased when the sweeping speed increased from 4–8 to 20 km h−1, the load decreased from 12.5 to 1.25 g m−2 and particle size decreased from sand to silt/clay size ranges. Runoff was induced by applying a 15 mm h−1 artificial rainfall to both swept and non-swept sections. Analysis of runoff quality showed that the event mean concentrations of total suspended solid, biological oxygen demand, chemical oxygen demand, nutrients and most of the heavy metals were reduced by 31–87% after sweeping. In addition, field tests for RDS build-up indicated a sweeping frequency of once every four or five days to prevent re-suspension of RDS. The results of this study suggest that sweeping can be the best management practice for effectively reducing RDS on highways and improving the quality of highway runoff.