Evaluation of the NO2 burden within a joint street canyon and tunnel portal micro environment

IF 0.5 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES
U. Uhrner, R. Reifeltshammer, P. Sturm
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引用次数: 0

Abstract

Substantial breaches in NO2 limits in the vicinity of a tunnel portal and street canyon micro environment provided the motivation for this paper. The impact of portal and surface road emissions was assessed and mitigation scenarios computed, in order to aid the authorities responsible. Emphasis was placed on detailed emission processing. A unique data set from nine NO2 monitors located near the portal and within the street canyon was used to evaluate the model approach using a Lagrangian particle model. Good agreement with measurements was obtained using simple NOx/NO2 conversion approaches. The NOx/NO2 concentration pattern is dominated by surface road emissions. A kerbside area of ~30 m in the driving direction is clearly dominated by the portal emissions indicating effective diffusion at the portal. Major uncertainties are related to the interaction of flow and turbulent mixing from ambient atmospheric conditions and traffic, particularly at low wind speed conditions.
街道峡谷与隧道入口联合微环境NO2负荷评价
隧道入口附近NO2限制的大量突破和街道峡谷微环境为本文提供了动力。评估了门户和地面道路排放的影响,并计算了缓解方案,以协助主管当局。重点放在详细的排放处理上。利用位于入口附近和街道峡谷内的9个二氧化氮监测仪的独特数据集,使用拉格朗日粒子模型来评估模型方法。使用简单的NOx/NO2转换方法与测量结果吻合良好。NOx/NO2浓度格局以路面排放为主。车辆行驶方向约30 m的路边区域明显受到门洞辐射的支配,表明门洞处的有效扩散。主要的不确定性与来自环境大气条件和交通的流动和湍流混合的相互作用有关,特别是在低风速条件下。
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来源期刊
CiteScore
1.10
自引率
0.00%
发文量
3
审稿时长
4.5 months
期刊介绍: IJEP provides an international forum in the field of environment and pollution and addresses early and medium-term challenges involving scientific prediction, modelling and assessment. It focuses on ground-breaking research in the science of environmental pollution, at the early scientific stage. It is one of three key journals which together offer complete coverage of environmental issues: IJETM focuses on technical/engineering, policy and management solutions for environmental problems, and IJGEnvI focuses on future, longer-term environmental scenarios, ecological economics, climate change and biodiversity.
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